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+This file summarizes all changes made to Tk since version 1.0 was
+released on March 13, 1991.  Changes that aren't backward compatible
+are marked specially.
+
+SCCS: @(#) changes 1.252 97/11/25 08:31:19
+
+3/16/91 (bug fix) Modified tkWindow.c to remove Tk's Tcl commands from
+the interpreter when the main window is deleted (otherwise there will
+be dangling pointers to the non-existent window).
+
+3/16/91 (bug fix) Modified tkColor.c not to free black or white colors:
+some X servers get upset at this.
+
+3/18/91 (bug fix) Modified tkShare.c to fix bug causing "DeleteGroup
+couldn't find group on shareList" panic.
+
+3/18/91 (bug fix) Several changes to tkListbox.c and tkScrollbar.c to
+handle listboxes (and scrollbars) with zero total entries in them.
+
+3/22/91 (bug fix) Fixed a few ='s in tkListbox.c that should be ==.
+
+3/22/91 (bug fix) Fixed error in main.c that caused BadWindow errors
+in some cases where wish scripts invoke "destroy .".
+
+3/23/91 (new feature) Added Tk_CancelIdleCall to remove Tk_DoWhenIdle
+handler.
+
+3/23/91 (bug fix and new feature) Added -name option to main.c, made
+it more clever about choosing name (was always using the name "wish"
+on most Unix systems).
+
+3/23/91 (new feature) Added TK_CONFIG_STRING option to Tk_ConfigureWidget,
+used it to malloc strings for various widget options that used to be
+Tk_Uid's (e.g. button text, message strings, etc.).  Eliminates core
+leaks when values change in continuous non-repeating fashion.
+
+3/29/91 (new feature) Added Tk_Preserve, Tk_Release, and
+Tk_EventuallyFree procedures to help manage widget records and avoid
+premature memory free-ing.
+
+4/4/91 (bug fix) Fixed problem in tkWm.c where top-level window geometry
+wasn't tracking correctly when wm-induced size change also changed window
+position (e.g. menus wouldn't be displayed at the right places).
+
+4/5/91 (new feature) Added "invoke" option to widget command for buttons,
+check buttons, and radio buttons.
+
+4/5/91 (new feature) Added "unpack" option to "pack" command.
+
+4/5/91 (bug fix) Changed tkPack.c to use new Tk_Preserve code and be
+more careful about window deletions that occur while repacking is in
+progress.
+
+4/6/91 (bug fix) Major overhaul of deletion code in all widgets to use
+Tk_Preserve and Tk_Release.  Should fix many problems.
+
+4/6/91 (bug fix) Changed "winfo children" to generate correct lists
+when child names have embedded spaces.
+
+4/6/91 (new feature) Added "screenheight" and "screenwidth" options to
+"winfo".
+
+4/18/91 (bug fix) Binding mechanism didn't correctly handle very long
+%-substitutions in commands (e.g. long path names) and caused memory
+to be overwritten.  Modified tkBind.c to fix.
+
+---------------------- Release 1.1, 4/18/91 -------------------------
+
+4/19/91 (bug fix) Inconsistent ICCCM handling of coordinates of reparented
+windows causes windows to gradually walk south when moved or resized.
+Fixed tkWm.c to patch around the problem.
+
+---------------------- Release 1.2, 4/24/91 -------------------------
+
+4/26/91 (new feature) Added -geometry and -display switches to wish.
+Also wrote wish manual entry.
+
+5/3/91 (bug fix) Fixed bug in tkListbox.c that caused garbage to appear
+at right edge of window when strings were to large to fit in window.
+
+5/3/91 (bug fix) Fixed bug in tkListbox.c where topIndex wasn't getting
+updated when elements were deleted:  tended to cause errors in
+communication with scrollbars.
+
+5/16/91 (bug fix) Fixed bug in tk3d.c, which caused core dumps when
+consecutive points in a polygon were the same (happened with some
+configurations of radio buttons, for example).
+
+5/16/91 (bug fix) Fixed main.c to allow stdin to be redirected.
+
+6/1/91 (bug fix) Make sure that pointers are never used after being
+freed.
+
+6/15/91 (bug fix) Fixed bug in tkBind.c that caused current binding
+values to not always be printed correctly.
+
+6/15/91 (bug fix) Make sure that interpreters are always unregistered
+when their main windows are deleted, and make wish delete the main
+window before exiting.
+
+8/21/91 (misfeature correction)  Automatically set source of window
+position to "user" in "wm geometry" command, unless it has been
+explicitly set to "program".
+
+9/5/91 (bug fix) Modified option code to accept '#' as a comment
+character in .Xdefaults files, in addition to '!'.
+
+9/10/91 (misfeature correction) Changed binding mechanism so that
+numeric %-sequences are output in decimal instead of hex.
+
+9/19/91 (bug fix) Fixed bug in Tk_DoOneEvent(1) where it wasn't
+checking files and X connections properly so it missed events.
+
+10/6/91 (new feature) Reorganized tkBind.c to provide generic "binding
+table" structure, which can be used to create bindings on items in
+canvases as well as windows.
+
+10/6/91 (new feature) Upgraded buttons and menus to use new tracing
+code in Tcl 6.0.  Allows radio buttons and check buttons to both set
+and clear themselves when associated variable changes.
+
+10/17/91 (bug fix) Fixed 2 bugs in listboxes: accidentally advanced the
+selection when new entries were inserted in the listbox after the location
+of the selected item(s), and goofed up on redisplay if selected item
+was deleted and then selection was immediately lost.
+
+10/27/91 (bug fix) "pack unpack" wasn't telling Tk that it no longer
+manages window;  this led to core dumps in some situations.
+
+10/31/91 (reorganization) Renamed manual entries so that they are no
+more than 14 characters in length.
+
+10/31/91 (reorganization) Changed tk.h and tkInt.h so that tkInt.h
+doesn't needed to be included by tk.h.
+
+11/3/91 (portability improvement) Eliminated use of "class" as a variable
+name, since it's a reserved word in C++.
+
+11/7/91 (reorganization) Many changes to upgrade for Tcl 6.1 including
+use of Tcl hash tables instead of separate "Hash_" module.  The "lib"
+subdirectory is no longer needed in Tk.
+
+---------------------- Release 1.3, 11/7/91 -------------------------
+
+11/24/91 (bug fix) Fixed bug causing occasional errors if existing bindings
+are modified (FindSequence in tkBind.c forget to set *maskPtr).
+
+11/24/91 (bug fix) Used wrong hash table in Tk_GetColorByValue.  Could
+cause new entries to get created unnecessarily.
+
+12/2/91 (bug fix) Changed "bind" code to put backslashes in front of
+special characters (e.g. [ or \) that appear in %-replacements, so that
+they can be parsed cleanly.
+
+12/10/91 (bug fix) Manual entries had first lines that caused "man" program
+to try weird preprocessor.  Added blank comment lines to fix problem.
+
+1/2/92 (documentation cleanup) Changed manual entries for Tk_GetBitmap
+and the like to make it more clear that the argument must be a Tk_Uid
+and not a string.
+
+1/2/92 (bug fix) Fixed problem where scrollbars that were very short or
+very narrow (too small to hold both arrows) could cause negative values
+in calls to XClearArea, which crashed some servers.
+
+1/2/92 (bug fix) Fixed bug in TkMeasureChars occurring when maxChars
+is 0.  Occasionally affected things like message window geometry.
+
+1/3/92 (new feature) Added procedures Tk_GetJustify, Tk_GetAnchor,
+Tk_GetCapStyle, and Tk_GetJoinStyle, plus support for these things
+in Tk_ConfigureWidget.
+
+---------------------- Release 1.4, 1/10/92 -------------------------
+
+1/12/92 (bug fix) TkMenubutton.c wasn't cleaning up mbPtr->varName
+properly during menubutton cleanup if an error occurred during
+menubutton creation.
+
+1/19/92 (bug fix) Fixed off-by-one bug in tkListbox.c that caused
+scrollbars to display a slider that was too large.
+
+2/10/92 (bug fix) Tk_CreateFileHandler didn't correctly handle case
+where new mask was specified for existing handler.
+
+2/13/92 (bug fix) Tk_DeleteAllBindings wasn't correctly removing
+bindings from the pattern table:  only did the removal for the
+first pattern in a pattern list.
+
+2/15/92 (new feature) Added procedures Tk_DefineBitmap and
+Tk_SizeOfBitmap.  Tk_GetBitmapFromData is now considered obsolete
+and probably shouldn't be used anymore.  Tk_GetBitmapFromData
+is now implemented by calling Tk_DefineBitmap and Tk_GetBitmap.
+
+2/15/92 (new feature) Added "curselection" and "select clear" options
+to widget command for listboxes.
+
+2/15/92 (new feature) Added Tk_3DBorderColor procedure.
+
+2/17/92 (relaxed limitations) Changed scrollbars so they no longer limit
+the slider position to lie within the object's range:  can scroll off the
+end of an object, if the object permits it.  Changed listboxes and
+entries to explicitly prevent viewing off the ends.  Also relaxed
+listbox index checks so that out-of-range indices are automatically
+adjust to fit within the listbox range.
+
+2/19/92 (bug fix) tkWindow.c tended to leave half-created windows around
+if a new window's name was found to be in use already.  Fixed to clean
+them up.
+
+2/22/92 (new feature) Added -anchor, -bitmap, -height, -textvariable,
+-width options to labels, buttons, check buttons, menu buttons, and radio
+buttons.  This means that (a) size can be controlled better, (b) bitmaps
+can be displayed in any buttons, (c) the position of the text within the
+button can be controlled, and (d) a button can be made to display the value
+of a variable, continuously updating itself.  Also changed -selector option
+so that if it's specified as an empty string then no selector is drawn
+for the button.
+
+2/22/92 (new feature) Changed menus to support bitmaps in menu entries:
+added new -bitmap option for entries.
+
+2/26/92 (bug fix) "after" command, when invoked with just one argument,
+called Tk_Sleep rather than registering a timer handler and looping on
+Tk_DoOneEvent.  As a result, it caused the application to become non-
+responsive to X events during the sleep.  Changed to use a Tk_DoOneEvent
+loop so that it is responsive.
+
+2/26/92 (bug fix) Tk's main program didn't map the main window until
+after the startup script returned.  Changed to map the window as a
+do-when-idle handler, so that scripts can cause the window to be
+mapped immediately with a call to "update" or "after".
+
+2/28/92 (bug fix) "wm withdraw" wasn't working if invoked before window
+was originally mapped:  window got mapped anyway.  Fixed so that the
+window doesn't get mapped as long as it's withdrawn.
+
+2/29/92 (new feature) Can use "focus none" to clear input focus.
+
+2/29/92 (bug fix) Fixed tkEvent.c to generate SubstructureNotify events
+properly.  These weren't being generated previously.
+
+2/29/92 (bug fix) Fixed entries so that newline characters can be properly
+displayed (as `\x0a').  Had to change interface to TkDisplayChars in order
+to do this (added flags argument).
+
+2/29/92 (bug fix) Change Tk not to update size and position of top-level
+windows directly during calls like Tk_ResizeWindow.  Instead, wait until
+actual event is received.  This makes updates happen at same time as
+callbacks.
+
+3/6/92 (bug fix) TkMenubutton.c was dumping core when a menubutton was
+pressed at a time when there was no associated menu for the button.
+
+3/6/92 (new feature) Added Tk script library directory with official
+Tk initialization file "tk.tcl".  Other procedures used by Tk are in
+other files.  Tk procedures and variables all have names starting
+with "tk_".  Also added Wish startup script "wish.tcl", which sources
+both the Tk and Tcl startup scripts.  This means that things like
+auto-loading and abbreviation expansion are now available in wish.
+Added new variables tk_library, tk_priv, and tk_version.
+
+3/6/92 (new feature) It's now possible to set bindings for whole
+classes by using the class name in the bind command.  For example,
+"bind Button <Enter> {puts stdout Hi!}" will cause a message to be
+printed whenever any mouse button is entered.  Can also use "all"
+to set bindings for all widgets.  Widget-specific bindings override
+class bindings which override "all" bindings.
+
+3/6/92 (reorganization) Changed buttons (all flavors) and listboxes to
+eliminate all hard-wired behavior.  Instead, default behavior is set
+by class bindings in tk.tcl.  Also set up class bindings for menus,
+menubuttons, and entries, which previously had no default behavior at
+all.  Scrollbars and scales still have hard-wired behavior that can't
+be overridden.
+
+3/7/92 (look-and-feel change) Changed listboxes and entries and menus
+to use button 2 for scanning instead of button 3.  This is more consistent
+with the official Motif use of button 2 for dragging.
+
+3/10/92 (new features) Added more options to "winfo" command:  screencells,
+screendepth, screenmmheight, screenmmwidth, and screenvisual.
+
+3/13/92 (bug fix) Event sharing mechanism (tkShare.c) wasn't checking
+to see whether window was mapped before sharing events with it.
+
+3/16/92 (bug fix) Tk_SetInternalBorderWidth was passing wrong window to
+geometry-management procedures, causing core-dumps when menu buttons
+had their border widths changed.
+
+3/16/92 (bug fix) Menus were setting their geometry directory rather
+than using Tk_GeometryRequest mechanism.
+
+3/17/92 (new feature) Added -cursor option to all widgets to set the
+active cursor for the widget.  Also added TK_CONFIG_ACTIVE_CURSOR
+configure type.
+
+3/18/92 (new feature) Implemented generalized screen coordinates to
+allow resolution-independent specification in many cases (but pixel-
+based coordinates are still OK).  Added Tk_GetScreenMM(),
+Tk_GetPixels(), new configure types TK_CONFIG_SCREEN_MM and
+TK_CONFIG_PIXELS.  Changed widgets to use this new configure types
+wherever possible (a few of the more complex cases still haven't
+been taken care of yet).  Added "pixels" and "fpixels" options to
+"winfo" command.
+
+3/18/92 (new feature) First cut at canvas widgets is done and part of
+the official Tk now.  Canvases display text and structured graphics,
+and allow you to bind commands to events related to the text and
+graphics.
+
+3/21/92 (new feature) Added new "place" command.  It implements a
+new geometry manager that provides fixed placement, rubber-sheet
+placement, and combinations of the two.  Eliminated the commands
+"move", "resize", and "map" that were provided by main.c but never
+officially supported;  the placer provides all of this functionality.
+
+3/23/92 (bug fix) Fixed bug in tkWm.c where top-level windows were
+occasionally not being given the right size.  The problem occurred
+when a string of resizes happened all in a row (such as deleting all
+the windows in an application and then recreating them).
+
+3/23/92 (new feature) Added Tk_CoordsToWindow procedure and
+"winfo containing" command.  These may be used to locate the window
+containing a given point.
+
+3/28/92 (new feature) Added "-exportselection" option to listboxes,
+so that listbox selection need not necessarily be the X selection.
+
+4/12/92 (bug fix) Changed menu buttons to store name of menubutton
+in the associated variable, rather than the name of the menu.  This
+is necessary in order to allow several menu buttons to share the
+same menu.
+*** POTENTIAL INCOMPATIBILITY ***
+
+4/12/92 (bug fix) Fixed core dump that occurred in tkError.c when
+removing the first error record from the error list.
+
+4/15/92 (bug fix) Fixed bug in tkBind.c that prevented <KeyPress-1>
+event specifications from being processed correctly:  the "1" was
+treated as a button name rather than a keysym.
+
+4/18/92 (new feature) Added Tk_DefineCursor and Tk_UndefineCursor
+procedures.
+
+4/18/92 (new feature) Major revision to listboxes.  Can now scroll and
+scan in both x and y, plus -exportselection option allows selection not
+to be exported.  The "view" widget command has been replaced by "xview"
+and "yview", and the "scan" widget command has a new syntax.
+*** POTENTIAL INCOMPATIBILITY ***
+
+4/18/92 (new feature) Added -exportselection option to entries, so you
+can select whether you want the entry selection to be the X selection
+or not.
+
+4/24/92 (new features) Added TK_CONFIG_CUSTOM type to Tk_ConfigureWidget,
+plus added new flags TK_CONFIG_NULL_OK, TK_CONFIG_DONT_SET_DEFAULT,
+and TK_CONFIG_OPTION_SPECIFIED.  Several other new types, such as
+TK_CONFIG_CAP_STYLE, were also added as part of implementing canvases.
+
+4/29/92 (bug fix) Changed "-selector" default for menus to have separate
+values for mono and color.
+
+4/30/92 (bug fix) Fixed bug in tkListbox.c where it occasionally generated
+bogus scroll commands (last index less than first).
+
+4/30/92 (reorganization) Moved demos directory to "library/demos".
+
+---------------------- Release 2.0, 5/1/92 -------------------------
+
+5/2/92 (bug fix) Fixed problem in tkListbox.c where it was doing too many
+redisplays after repeated insertions.  Also reduced number of invocations
+of scrollbar commands.
+
+5/7/92 (portability improvement) Changed main.c not to use TK_EXCEPTION
+flag;  it isn't needed and it causes problems on some systems.
+
+5/9/92 (bug fix) Plugged core leaks in tkListbox.c and tkBind.c
+
+5/9/92 (bug fix) TkBind.c was accidentally deleting bindings during
+attempts to print non-existent bindings.
+
+5/11/92 (bug fix) Maximum name length for applications (name used in
+"send" commands) was too short (only 20);  increased to 1000.  Also
+fixed bug related to over-long names that caused core dumps.
+
+5/13/92 (bug fix) tkShare.c was using a dangling pointer if a share
+group was deleted as a side-effect of a shared event.
+
+5/13/92 (bug fix) Various initialization and core leak problems in
+tkGC.c, tkSend.c, tkMenu.c, tkEvent.c, tkCanvas.c, tkCanvPoly.c,
+tkCanvLine.c, tkListbox.c, tkEntry.c.
+
+5/13/92 (bug fix) Empty entries could be scanned off the left edge,
+displaying a garbage character.
+
+5/13/92 (bug fix) Fixed a few problems with window manager interactions,
+such as tendency for windows to spontaneously shrink in size.  By no
+means are all of the problems fixed, though.
+
+5/13/92 (performance optimization) Changed Tk_GeometryRequest not to
+invoke geometry manager unless requested size has changed.
+
+---------------------- Release 2.1, 5/14/92 -------------------------
+
+5/1/92 (new features) Added flags like TK_IDLE_EVENTS to Tk_DoWhenIdle,
+plus added "idletasks" option to "update" command.  Tk_DoWhenIdle arguments
+look different now, but the change should be upward-compatible.
+
+5/17/92 (new feature/bug fix) Added support for VisibilityNotify events
+to the "bind" command.  For some reason they weren't supported previously.
+
+5/17/92 (new feature) Added "tkwait" command.
+
+5/17/92 (new feature) Added "grab" command.
+
+5/17/92 (new feature) Added "-width" option to messages.  Also changed
+messages to use the computed (i.e. desired) line length when displaying,
+not the actual width of the window.
+
+5/17/92 (bug fixes) Did some more fiddling with tkWm.c in the hopes
+of improving window manager interactions.  Now there won't be more than
+one configure request outstanding to the wm at a time.
+
+5/17/92 (bug fix) Arrowheads on canvas lines weren't being translated
+or scaled correctly.
+
+5/20/92 (bug fix) Page-mode scrolling didn't work correctly for canvases
+(wrong windowUnits was passed to scrollbars).
+
+5/20/92 (bug fix) Changed scrollbars not to lose highlight when pointer
+leaves window with button down.  Also changed redisplay to double-buffer
+for smoother redraws.
+
+5/21/92 (new feature) Added "gray50" and "gray25" as predefined bitmaps.
+
+5/22/92 (new feature) Buttons can now be disabled using the "-state" and
+"-disabledforeground configuration options.  The "activate" and "deactivate"
+widget commands for buttons are now obsolete and will go away soon.
+Please change Tcl scripts not to use them.
+
+5/23/92 (new feature) Entries can now be disabled using the "-state"
+config option.  Also improved class bindings for entries to keep the
+cursor visible in the window when operations occur.  Also made slight
+improvements in the way redisplay is done.
+
+5/23/92 (new feature) Added "-textvariable" option to entries so that
+the text in an entry can be tied to the value of a global variable in
+a fashion similar to buttons.
+
+5/27/92 (new feature) Added "-textvariable" and "-anchor" options to
+messages.
+
+5/28/92 (new feature) Added "-padx" and "-pady" and "-underline" options
+to menubuttons.
+
+5/28/92 (feature change) Changed "-width" and "-height" options on
+all flavors of buttons and menubuttons so that they are orthogonal
+to "-padx" and "-pady".  It used to be that -width overrode -padx
+(no padding).  Now they accumulate.
+
+5/29/92 (new feature) Added "-disabledforeground" option to menus and
+all flavors of buttons (can specify color for disabled things rather
+than just using stipple to gray out).
+
+5/29/92 (new features) Added many new options to menu entries:
+-activebackground, -background, -font, -state, -underline.  The
+"disable" and "enable" widget commands for menus are now obsolete
+and will go away soon.  Please change Tcl scripts not to use them.
+
+5/29/92 (new features) Added "atom" and "atomname" options to "winfo"
+command.
+
+5/29/92 (new feature) Wrote tk_listboxSingleSelect procedure, which
+can be used to change listbox behavior so that only a single item is
+selected at once.
+
+6/1/92 (new feature) Added new modifier names "Meta" and "Alt" for
+"bind" command.
+
+6/3/92 (new feature) Added "winfo toplevel" command.
+
+6/3/92 (new feature) Made several changes for greater Motif compliance,
+including:
+    - menu retention if you click and release in the menu button,
+    - keyboard traversal of menus (see traversal.man)
+    - no widget flashing if you set $tk_strictMotif to 1
+
+6/15/92 (bug fix) Fixed problem in tkBind.c where command string for a
+binding could get reallocated while the command was being executed (e.g.
+bindings that delete or change themselves).
+
+6/15/92 (bug fix) Don't allow "tabWidth" field to become zero in tkFont.c:
+can cause core dumps for fonts that don't enough information to compute
+tab widths.
+
+6/19/92 (bug fix) Fixed bug in binding mechanism that caused structure-
+related events to be reported both to the correct window and its parent.
+
+7/14/92 (bug fix) Changed tkColor.c not to free colors for visual types
+StaticGray or StaticColor.
+
+7/15/92 (new feature) Text widgets now exist.  They display any number of
+lines of text with a variety of display formats, and include hypertext
+facilities.  See the manual page for details.
+
+7/20/92 (bug fix) If a top-level window was put in the iconic state to
+begin with, it could be deiconified with "wm deiconify .foo" until it had
+first been deiconified by hand from the window manager.  Tk was getting
+confused and thought the window was mapped when it wasn't.
+
+7/29/92 (bug fix) Don't permit rectangles or ovals to have zero-sized
+dimensions.  Round up to at least one pixel.
+
+7/29/92 (new features) Major upgrade to canvases:
+    - new item types: arc, window, bitmap
+    - added Bezier spline support for lines and polygons
+    - rectangles and ovals now center their outlines on the shape,
+      rather than drawing them entirely inside the shape
+    - new "coords" and "bbox" widget commands
+    - new "-tags" option for all item types.
+    - new "-confine" option to prevent scrolling off edge of canvas.
+
+8/6/92 (new feature) Added "-width" and "-height" options to frames.
+The "-geometry" option is now obsolete and should be removed from Tcl
+scripts:  it may go away in the future.
+
+8/7/92 (bug fix) Error messages in Tk_ParseArgv were sometimes including
+the option name where they should have included its value.
+
+---------------------- Release 2.2, 8/7/92 -------------------------
+
+8/7/92 (bug fix) Changed tkCanvas.c to be more conservative in the area
+it passes to XCopyArea.
+
+8/8/92 (bug fix) Fixed bug in tkTextDisp.c that sometimes caused core
+dumps when text views changed (e.g. typing return on last line of screen).
+
+8/8/92 (bug fix) Fixed bug in menu.tcl that caused errors when using
+keyboard to traverse over separator menu entries.
+
+8/10/92 (bug fix) Changed to use OPEN_MAX instead of MAX_FD to compute
+maximum # of open files.
+
+8/10/92 (bug fix) Canvases weren't updating scrollbars on window size
+changes.  They also weren't recentering canvases on window size changes.
+
+8/10/92 (bug fix) There were still a few places where commands were being
+invoked at local level instead of global level (e.g. commands associated
+with buttons and menu entries).
+
+8/10/92 (bug fix) TkBind.c used to ignore explicit shift modifiers for
+all keys (i.e. <Shift-Tab> was treated the same as <Tab>).  Modified to
+allow explicit request for shift modifier, like <Shift-Tab>.
+
+8/13/92 (feature change) Changed default fonts to request "Adobe" fonts
+explicitly.
+
+8/16/92 (bug fixes) Modified tkCanvArc.c and tkTrig.c to increase slightly
+the bounding boxes for arcs, in order to make sure that proper redisplay
+occurs when arcs are moved (little turds were getting left behind).
+
+8/16/92 (bug fix) Modified tkCanvas.c not to redraw at all if the redisplay
+area is off the screen.  Also, only do a background clear for the portion
+of the redraw area that is on-screen.  Also, reduced size of off-screen
+pixmaps used for redisplaying, which speeds up redisplay in some cases.
+
+8/19/92 (bug fix) Canvases that were taller than wide were not being
+redisplayed properly.
+
+8/20/92 (new feature) Added Tk_CreateGenericHandler procedure for trapping
+all X events (useful for tracing, watching non-Tk windows, etc.).
+
+8/21/92 (bug fix) Widgets weren't always being notified when they got
+the focus back again (the problem had to do with grabs and menus in
+particular).
+
+8/21/92 (new feature) Added "-state" option to scale widgets.
+
+8/22/92 (new feature) Changed tkBitmap.c to allow tilde-substitution
+to occur in bitmap file names.
+
+---------------------- Release 2.3, 8/24/92 -------------------------
+
+8/27/92 (bug fix) Changes to -activebackground and -activeforeground options
+for menubuttons were being lost.
+
+8/27/92 (bug fix) Entries were selecting last character when a B1-drag
+occurred past the right edge of the text.
+
+8/28/92 (bug fix) Fixed bug in canvases where a grab during a button
+press caused the canvas state to lock up so that it didn't select a
+new current item.
+
+9/7/92 (bug fix) Changed tkMenu.c to accept numerical menu indices that
+are out of range;  now it just rounds them off to the nearest existing
+entry.
+
+9/7/92 (bug fix) Fixed bug in tkTextDisp.c that caused core dumps when
+invoking "yview -pickplace" widget command on texts that are too small
+to hold any lines at all.
+
+9/11/92 (bug fix) Fixed bug in tkTextDisp.c that caused core dumps
+when adding tags to non-existent lines.
+
+9/11/92 (bug fix) Line items in canvases didn't permit an empty fill
+color (i.e. couldn't make them transparent).
+
+9/14/92 (reorganization) Changed manual entries to use .1, .3, and .n
+extensions.  Added "install" target to Makefile to suggest how Tk should
+be installed.
+
+9/16/92 (bug fix) Changed tkSend.c to always specify the root window of
+screen 0 rather than using DefaultRootWindow.  DefaultRootWindow doesn't
+always go to screen 0 on displays with multiple screens, which can result
+in send's not being possible between the screens.
+
+9/18/92 (new feature) Added three new options to "wm" command: "protocol",
+"client", and "command".  These provide support for window manager protocols
+such as WM_DELETE_WINDOW and WM_TAKE_FOCUS, plus support for the
+WM_CLIENT_MACHINE and WM_COMMAND properties.
+
+9/30/92 (new feature) Implemented color model support, including
+"tk colormodel" command and Tk_GetColorModel and Tk_SetColorModel
+procedures.  These allow you to force mono operation even on a color
+display.  Also changed color allocation not to give errors when colors
+run out, but just to switch to a mono color model.
+
+10/1/92 (bug fixes) Fixed two bugs in tkTextBTree.c that caused core dumps
+during text deletion.
+
+10/5/92 (bug work-around) Changed tkColor.c to ignore errors when freeing
+colors.  This is needed to work around improper reference count management
+for colormap entries under X11/NeWS.
+
+10/7/92 (new feature) Added support for different visual types, including
+procedures Tk_SetWindowVisual and Tk_SetWindowColormap, plus macros
+Tk_Visual, Tk_Depth, and Tk_Colormap.  The code for this was contributed
+by Paul Mackerras.
+
+10/7/92 (new feature) Added Tk_IsTopLevel macro.
+
+10/12/92 (bug fix) Fixed bug in tk.tcl that caused torn-off menus with
+cascaded children not to track mouse motion correctly (the cascade
+switched in response to mouse motions within the cascaded child).
+
+10/12/92 (new feature) Major changes to focus handling:
+(a) Tk watches FocusIn and FocusOut events for focus changes, not Enter
+    and Leave, so it will work better with explicit-focus-model window
+    managers (e.g. mwm in default mode).
+(b) Tk generates FocusIn and FocusOut events for the focus window now.
+    The old procedural interface (via Tk_CreateFocusHandler) is obsolete
+    and is no longer used inside Tk.  It is still supported for
+    compatibility, but won't be for long.  You should change your code
+    to use FocusIn and FocusOut events instead.
+(c) The model for FocusIn and FocusOut events is different than the
+    one described in Xlib documentation.  See the "focus" manual entry
+    for details.
+(d) If there is no input focus then keyboard events are discarded.  They
+    used to be directed to the mouse pointer window, although this wasn't
+    documented.  The focus now defaults to the root window.
+*** POTENTIAL INCOMPATIBILITY ***
+
+10/15/92 (bug fix) Fixed text items in canvases where they didn't
+display the insertion cursor if the item had no characters in it.
+
+10/26/92 (bug fix) Fixed bug in tkSelect.c that occasionally caused
+BadWindow X protocol errors when retrieving the selection.  Tk wasn't
+making sure that a window existed before using it to retrieve the
+selection.
+
+10/30/92 (feature change) Changed canvases so that if the scroll region
+is smaller than the window and -confine is on, the scroll region isn't
+forced to be centered in the window;  it can be anywhere that meets the
+confinement restrictions.
+
+11/2/92 (new feature) Added "winfo exists" command.
+
+11/5/92 (new feature) Changed DoWhenIdle handlers so that if a new
+when-idle handler is created as a side-effect of another when-idle
+handler, the new handler isn't invoked until Tk has first checked
+for other events to process.
+
+11/6/92 (bug fixes, new features) Major overhaul of window manager
+interface:
+(a) Tk should now work with virtual-root window managers;
+(b) windows will now place more accurately on the screen and stay where
+    they're supposed to;
+(c) size changes handled more reliably;
+(d) code now works robustly in the face of withdrawals followed
+    immediately by deiconifications.
+(e) Added new procedure Tk_GetVRootInfo and new options to "winfo" command:
+    vrootx, vrooty, vrootwidth, vrootheight.
+(f) Added "overrideredirect" option to "wm".
+(g) Fixed bug where change in width-only via "wm geom" didn't always work
+   (min and max window sizes weren't being set properly for the wm).
+
+11/6/92 (bug fixes) Modified menus so that they work correctly with
+virtual root window managers.  Also fixed bug where menus didn't move
+along with their associated windows, so that the menu popped up at
+the old location of the window rather than its new location.
+
+11/9/92 (new constraint) Made it illegal to give windows names that
+start with upper-case letters, since such names will goof up the
+option database by appearing to be classes rather than names.
+*** POTENTIAL INCOMPATIBILITY ***
+
+11/10/92 (new feature) Added Postscript output to canvases.
+
+11/13/92 (bug fix) Changed default for maximum size passed to window
+manager from 1000000 (which causes some wm's to make windows too large
+when "maximized") to the size of the display.
+
+11/14/92 (feature change) Major overhaul of menubuttons and pull-down
+menus.  Removed event-sharing code, including Tk_ShareEvents and
+Tk_UnshareEvents.  The -variable option for menubuttons has been
+removed,and the "post" and "unpost" widget commands for menubuttons
+no longer exist.  The "post" widget command for menus no longer
+allows a group option.  The procedure tk_menus has been replaced
+with a new procedure, tk_menuBar, which has a slightly different
+interface.
+*** POTENTIAL INCOMPATIBILITY ***
+
+11/20/92 (new features, feature changes) Major overhaul of grab
+mechanism to produce more correct event streams.  Also changed Tcl
+commands to require explicit window for grab releases (makes it
+possible for grabs to work on multiple displays simultaneously).
+The old "grab none" command no longer exists, but new options
+have been added: "current", "release", "set", and "status".
+*** POTENTIAL INCOMPATIBILITY ***
+
+11/20/92 (new feature) Use TK_LIBRARY environment variable to set library
+directory location, if it is defined.  Otherwise fall back on usual
+compiled-in value.
+
+11/25/92 (bug fix) "wm grid" command was using wrong window.
+
+11/29/92 (bug fix) Fixed core dump that occurred when trying to use
+placer on top-level windows: return error instead.
+
+11/29/92 (bug fix) Selection retrieval wasn't making sure that the window
+on whose behalf selection is being retrieved actually exists.
+
+12/3/92 (new feature) Added support for Mode_switch key to support the
+full ISO character set.  Also added event handlers for MappingNotify
+events so that Tk updates itself in response to keycode and modifier
+changes.
+
+12/6/92 (bug fix) Ignore recursive attempts to destroy window.
+
+12/9/92 (new demos) Added "tcolor" and "rmt" demos.
+
+12/10/92 (new features) Added "yposition" widget command for menus,
+changed "delete" widget command to take an optional second index,
+and changed -command option for cascade entries so that it is
+invoked when the entry is activated rather than when it is invoked.
+*** POTENTIAL INCOMPATIBILITY ***
+
+12/12/92 (implementation change)  Changed the procedures Tk_FreeBitmap,
+Tk_NameOfBitmap, Tk_SizeOfBitmap, Tk_FreeCursor, Tk_NameOfCursor, and
+Tk_FreeGC to require an addition Display argument.  This is needed for
+Tk to function correctly when an application has windows on multiple
+displays.
+*** POTENTIAL INCOMPATIBILITY ***
+
+12/12/92 (new feature) Started creating a test suite.  Right now it
+only has a few tests.
+
+12/12/92 (new feature) Modified the packer so that a window can be
+packed in descendants of its parent (used to be restricted to the
+parent alone).  This makes it possible to hide extra windows used
+for geometry management.  Also, can use generalized screen distances
+in the "pack" command.
+
+12/16/92 (feature change) Boolean options such as -exportselection now
+print as 0/1 rather than true/false (both the default and current values
+print this way).  This makes it easier to use these values in expressions.
+*** POTENTIAL INCOMPATIBILITY ***
+
+12/16/92 (name change) The classes "RadioButton" and "CheckButton" have
+been renamed "Radiobutton" and "Checkbutton" for consistency.  From now
+on widget class names will have exactly one capital letter.
+*** POTENTIAL INCOMPATIBILITY ***
+
+12/16/92 (new feature) Added -setgrid option to listboxes.
+
+12/16/92 (new feature) The "destroy" command, and the "delete" widget
+command for canvases, now accept any number of arguments, including
+zero.
+
+12/16/92 (new feature) Changed internal TkBindError procedure to
+Tk_BackgroundError and exported it to Tk clients.
+
+12/16/92 (option name change) Changed the place command's "dependents"
+option to "slaves" for better consistency with documentation.
+*** POTENTIAL INCOMPATIBILITY ***
+
+12/16/92 (name changes) Renamed the "cursor*" options in entries and
+canvases to "insert*".  Also renamed the "cursor" index to "insert" and
+the "cursor" widget command to "icursor".  This was done to avoid
+confusion between the mouse cursor and the insertion cursor.
+*** POTENTIAL INCOMPATIBILITY ***
+
+---------------------- Release 3.0, 12/17/92 -------------------------
+
+12/17/92 (bug fix) Fixed dangling-pointer bug in canvases that occurred
+if a <LeaveNotify> binding deleted the current item.
+
+12/18/92 (bug fix) Core dump occurred if "wm" invoked with no arguments.
+Also, tkWm.c wasn't properly setting WM_CLASS property on application
+startup.
+
+12/18/92 (incorrect documentation) Updated manual entries for Tk_FreeGC,
+Tk_FreeCursor, and Tk_FreeBitmap to reflect new interface that requires
+"display" argument.
+
+12/18/92 (missing documentation) Added documentation for the canvas
+"postscript" command, which was missing in the 3.0 release.
+
+12/21/92 (bug fixes) There were lots of problems with the new installation
+targets in the Makefiles, such as using "cp -f" and not installing
+prolog.ps.  Made several other miscellaneous improvements to Makefile.
+
+12/21/92 (bug fix) Arrowheads on canvas line items weren't moving properly
+after coordinate changes made with the "coords" widget command.
+
+12/21/92 (bug fix) If top-level window was initially withdrawn, couldn't
+ever deiconify it again.
+
+12/21/92 (bug fix) Double-button event sequences didn't always trigger
+properly when grabs were in effect.
+
+12/22/92 (bug fix) The packer didn't display any top or bottom windows
+after a left or right expanded window, and vice versa.  Also made the
+distribution of space among expanded windows more even.
+
+12/28/92 (new features) Several improvements to selection:
+(a) Added procedures Tk_ClearSelection and Tk_DeleteSelHandler.
+(b) Added "clear" and "own" options to "selection" command, extended
+    "handle" option to delete handlers.
+(c) Error returns from "selection handle" scripts are now turned into
+    selection retrieval errors ("no such selection") rather than an
+    empty selection.
+(d) Tk responds automatically for targets APPLICATION (name of application,
+    so you can "send" to it) and WINDOW_NAME (name of window within
+    application.
+(e) Added test file "select.test" to test suite.
+
+12/28/92 (bug fix) Fixed problem with flashing menus that occurred
+because menu.tcl was willing to unpost and then immediately repost
+the same menu.
+
+1/6/93 (bug fix) Test for UnmapNotify events in tkPack.c used = instead
+of ==.
+
+1/21/93 (bug fix) Changed many widgets to eliminate use of
+DefaultVisualofScreen, DefaultColormap, etc. and use the visuals
+and colormaps for the actual windows instead.  Also changed to
+inherit colormaps and windows from parent by default.
+
+1/21/93 (new features) Added new winfo options "cells", "depth", and
+"visual".
+
+1/23/93 (bug fix) Fixed problem with text display that could result
+in negative XCopyArea heights being sent to X server.  This causes some
+servers (e.g. some versions of OpenWindows) to crash.
+
+1/25/93 (new feature) Added -postcommand option to menus, so that menus
+can be reconfigured before each posting.
+
+1/29/93 (feature change) Changed %X and %Y in bindings so that they
+refer to the virtual root rather than the true root.  Although
+potentially incompatible, this change should almost always "do the
+right thing".
+*** POTENTIAL INCOMPATIBILITY ***
+
+1/31/93 (bug fix) Changed "send" code to grab server while updating
+the registry property (before this fix, two programs could allocate
+the same interpreter name if they started up simultaneously).  In
+order to make this fix I had to change the code for reclaiming
+names of dead interpreters in a way that sometimes allows dead
+interpreters to persist in the registry.
+
+2/1/93 (feature change) Changed entries to allow leftmost "visible"
+character to be the end of the text (i.e. no characters actually visible).
+This is needed so that the cursor can be displayed even if the last
+actual character is too wide to fit in the window.
+
+2/3/93 (bug fix) Fixed two bugs in tkFocus.c:  (a) FocusIn events
+were getting lost in some cases because the focus window hadn't been
+created yet (e.g. new top-level window pops up underneath the mouse);
+(b) Tk was accidentally triggering FocusOut events when the mouse
+moved from a top-level window to one of its children.
+
+2/4/93 (new feature) Added "visibility" option to "tkwait" command to make
+it easier to wait for a new window to appear on the screen.
+
+---------------------- Release 3.1, 2/5/93 -------------------------
+
+2/10/93 (installation improvements) Makefile improvements:  added RANLIB
+variable for easier Sys-V installation, changed to use INCLUDE_DIR
+properly, and added SHELL variable for SGI systems.
+
+---------------------- Release 3.2, 2/11/93 -------------------------
+
+2/11/93 (new feature) Added "wm state" command, and improved wm so that
+the right thing will happen if you invoke "wm iconify" when a window is
+withdrawn.
+
+2/14/93 (bug fix) When -colormap option was used in generating Postscript
+for canvases, Tk didn't add an extra space after the color command.
+
+2/14/93 (new feature) Changed "extern" declarations in tk.h to "EXTERN",
+which will use the definition of EXTERN from tcl.h and work correctly
+in C++ programs.
+
+2/18/93 (bug fix) Item-specific bindings weren't getting deleted from
+canvas items when the items were deleted.  As a result, they could
+suddenly re-appear for new items if the new items were allocated a
+record at the same addresses as the old ones.
+
+2/18/93 (feature reversal) Changed "after" back again, so that it sleeps
+*without* responding to events when it is invoked with just one argument;
+can always use tkwait plus after with additional arguments to achieve
+the effect of responding to events.
+*** POTENTIAL INCOMPATIBILITY ***
+
+2/20/93 (bug fix) Fixed bug in tkWindow.c where colormaps weren't being
+set correctly for new top-level windows on different screens than their
+parents (the bug results in X protocol errors: "invalid Colormap
+parameter").
+
+2/22/93 (bug fix) Changed "#!/usr/local/wish" in demo scripts to
+"#!/usr/local/bin/wish" to reflect new location of binary.
+
+2/22/93 (new feature) Added new reliefs "groove" and "ridge".
+
+2/25/93 (new feature) Added new built-in bitmaps:  "error", "hourglass",
+"info", "question", "questhead", and "warning".  Also added new demo in
+"widget" to display all of these (under the Miscellaneous menu).
+
+2/25/93 (improved implementation) Changed DrawText procedure in
+prolog for outputting Postscript from canvases to use stringwidth
+instead of charpath+pathbbox:  avoids limitcheck problems with long
+strings, and also properly includes space characters in calculation.
+
+2/25/93 (bug fix) Fixed several bugs in library/menu.tcl that caused
+menu traversal to mis-behave when menu had no entries.
+
+2/26/93 (new feature) Added "wm frame" command.
+
+3/6/93 (bug fix) Mwm in click-to-focus mode was goofing up grabs so that
+pull-down menus were sometimes unresponsive.  Modified tk.tcl to ignore
+the spurious B1-Enter events generated by mwm, plus modified tkGrab.c to
+release simulated button grabs correctly.
+
+3/8/93 (bug fix) Tk had wrong interpretation of "lbearing" font metric,
+which caused text to be displayed at the wrong horizontal position in
+several places (labels/buttons, listboxes, canvas text, scales).  This
+change will cause slight changes in the way certain widgets are
+displayed.
+
+3/12/93 (bug fix) Fixed core dumps that occurred in tkEntry.c because of
+zero values in entryPtr->avgWidth.
+
+3/12/93 (bug fix) Tk_CoordsToWindow was using root coordinates always.
+Changed to use virtual-root coordinates when a virtual-root window
+manager is being used.  Before this fix, "winfo containing" didn't
+return the correct window under virtual-root window managers.
+
+3/18/93 (bug fix) Modified tkWm.c so that Tk doesn't fight with window
+manager over position of window;  it just takes what the window manager
+gives it.
+
+3/21/93 (new feature) Changed menus to display cascade entries with
+standard Motif arrows at right side.a
+
+3/22/93 (bug fix) Fixed bug in tkPack.c that was causing memory to
+get trashed with the integer value 1.
+
+3/22/93 (bug fix) Canvas text didn't print correctly if it contained
+an open paren (or other special character) immediately followed by
+an octal digit.
+
+3/22/93 (bug fix) Text widgets didn't redisplay properly in cases
+where two or more groups of lines both got taller at the same time
+(e.g. from tag changes), causing two separate bit copies where the
+first bit copy's target area overlapped the source area for
+the second bit copy.
+
+4/1/93 (bug fix) Changed canvases to use ISO Latin-1 font encoding
+if that's supported by the Postscript interpreter.  Also added workaround
+for bug in NeWSprint related to stipple fills.
+
+4/1/93 (bug fixes) Made various changes to focusing and grabs to
+eliminate extraneous focus events and generally improve behavior.
+
+4/2/93 (bug fix) Modified tkWm.c not to wait indefinitely for the window
+manager to map or reconfigure a window:  this led to deadlock in some
+situations, such as creating a new top-level window with a grab held.
+
+4/19/93 (bug fix) Fixed another bug in tkWm.c that caused windows to walk
+across the screen in some situations.  Also fixed problem where rapid
+posting and unposting of cascaded submenus (or menus?) could cause Tk
+to become confused about whether or not a window is mapped (added
+TkWmUnmapWindow procedure to make top-level unmaps synchronous).
+
+4/24/93 (feature change) Changed the "after" command to allow times
+less than or equal to 0, and to use 0 whenever they occur.
+
+4/26/93 (new feature) Implemented security check for "send" as proposed
+by Bennett Todd: incoming sends are now rejected unless (a) xhost-style
+access control is enabled and (b) the list of authorized hosts is
+empty.  In other words, you have to use xauth to use send.  This feature
+can be disabled by setting the TK_NO_SECURITY flag at compile-time.
+
+5/15/93 (improvement) Switched to use Tcl_PrintDouble whenever returning
+real values as Tcl results.  This potentially allows higher precision.
+Switched to use %.15g whenever printing reals in Postscript files.
+However, the change Tcl_PrintDouble causes incompatibilities.  For
+now, it's disabled with a macro in tclInt.h that redefines Tcl_PrintDouble.
+Tk 4.0 will delete the macro, and you can also delete it now if you
+want the better (but incompatible) behavior.
+
+5/19/93 (bug fix) Fixed divide-by-zero problem that could occur in
+closeness calculations for canvas oval items.
+
+5/30/93 (bug fix) PROP and CONFIG were accidentally #defined to the same
+value in tkBind.c, which could cause incorrect %-substitutions in event
+bindings in a few exotic cases.
+
+6/4/93 (improvement) Changed to use GNU autoconfig for configuration.
+Makefile format changed, and Tcl is no longer automatically included
+in Tk releases.
+
+6/7/93 (bug fix) Fixed off-by-one error in rounding negative coordinates
+during redisplay of canvases.
+
+6/9/93 (feature improvement) Modified default bindings for entries to
+keep one character visible to the left of the cursor during backspaces.
+
+6/18/93 (feature improvement) Added patchlevel.h, for use in coordinating
+future patch releases, and also added tk_patchLevel variable to make the
+patch level available in scripts.
+
+6/26/93 (bug fix) Fixed numeric problems in scales that occurred with
+very large scale values.
+
+6/26/93 (bug fix) Polygon items in canvases could cause core dumps if
+the "coords" widget command was used to add one new coordinate.
+
+6/26/93 (bug fix) Changed canvases to handle large stipple patterns
+gracefully (stipples used to jump around during redisplay and lose
+coherency).
+
+7/1/93 (syntax change, new feature) Implemented the new packer syntax
+as described in the book.  For now the old syntax will continue to be
+supported too.  Converting over is straightforward except (a) use
+"-anchor" instead of "frame", and (b) padding is different (separate
+internal and external padding, plus pad amounts are *on each side*
+instead of total).  Also added "pack propagate" command for keeping
+the packer from setting the master's requested size.
+
+7/1/93 Changed copyright notices.  The effect is the same as with the
+old notices, but the new notices more clearly disclaim liability.
+
+7/7/93 (new feature) Added support for window stacking order.  Windows
+will now stack in the order created (most recent on top), plus "raise"
+and "lower" commands may be used to restack (Tk_RestackWindow procedure
+is available from C level).
+
+7/7/93 (reorganization) Moved main.c to tkMain.c, reorganized it to
+call Tcl_AppInit just like tclsh does, and added argv0 variable to contain
+application name, and added default Tcl_AppInit procedure for wish.
+Also added tkTest.c to hold C code for testing.
+
+7/7/93 (new feature) Added new Tk-specific "exit" command, which cleans
+up properly before exiting.  It replaces the Tcl "exit" command, and
+can be used in place of "destroy .".
+
+7/9/93 (new features) Added tk_dialog library procedure that creates
+dialogs with a bitmap, message, and any number of buttons.  Also changed
+default tkerror procedure to use tk_dialog plus offer the user a chance
+to see a Tcl stack trace.
+
+-------------------- Release 3.3 Beta 1, 7/9/93 -------------------------
+
+7/12/93 (configuration changes) Eliminated leading blank line in
+configure script;  provided separate targets in Makefile for installing
+binary and non-binary information; fixed -lnsl and -lsocket handling
+in configure; added autoconf support for fd_set type; check for various
+typedefs like mode_t and size_t, and provide substitutes if they
+don't exist; don't include tkAppInit.o in libtk.a; try to locate the
+X includes and library in all of the standard places for various systems.
+
+7/14/93 (new feature) Modified tkMain.c so that it stores the value
+of the -display command-line option into the DISPLAY environment
+variable, if it is specified.
+
+7/15/93 (feature removal) Removed auto-initialization feature from
+Tk_ConfigureWidget, so that you must once again initialize all fields
+of a widget record before calling Tk_ConfigureWidget.  This restores
+the behavior back to what it was in Tk 3.2.
+
+7/16/93 (bug fix) Modified tkBind.c to ignore the Caps Lock modifier
+unless it is explicitly requested in a binding.  Without this fix,
+buttons and menus and other things didn't work if the Caps Lock key
+was active.
+
+-------------------- Release 3.3 Beta 2, 7/21/93 -------------------------
+
+7/21/93 (new feature) Change "make install" so that it will modify the
+#! lines on demo scripts to reflect the place where the wish binary
+is installed.
+
+7/23/93 (new feature) Added Tk_MainWindow procedure that returns the
+main window associated with a Tcl interpreter.  This is intended for
+use by Tcl_AppInit and other initialization procedures.
+
+7/24/93 (configuration improvements) Changed configure script not to
+omplain about "fd_set" missing if it's defined in <sys/select.h>.
+
+7/28/93 (bug fix) "Bad Match - parameter mismatch" errors were
+sometimes occurring when several top-level windows got created
+at the same time, due to wrong choice of sibling when stacking
+windows.
+
+8/14/93 (new feature) Added support for tcl_prompt1 and tcl_prompt2
+to wish main program:  makes prompts user-settable.
+
+8/19/93 (bug fix) Bindings to event sequences like "aD" never matched
+because the Shift key has to be pressed before D.  Modified Tk to
+ignore extraneous keypresses if they are for modifier keys.
+
+8/26/93 (configuration changes) Added Tk_Init, modified Tcl_AppInit
+procedures to use it and Tcl_Init.  Added support for .wishrc file.
+
+8/28/93 (new feature) The main window is now a legitimate toplevel
+widget.
+
+-------------------- Release 3.3 Beta 3, 8/30/93 -------------------------
+
+9/2/93 (bug fix) The packer wasn't always relaying out a master after
+changes to some of the configuration options of its slaves.
+
+9/2/93 (bug fix) The binding mechanism made it impossible for patterns
+like <Double-ButtonRelease-1> to ever match.
+
+9/2/93 (bug fix) Fixed core dump that occurred for bitmap canvas items
+if Postscript is generated but no -bitmap option has been specified.
+
+9/4/93 (enhancement) Slight improvements to menu traversal:  set menu
+traversal bindings for menubar window in tk_menuBar, plus trigger
+traversal on <Any-Alt-Keypress> instead of <Alt-Keypress>.
+
+9/9/93 (bug fix) Changed tkBind.c so that the Num_Lock key doesn't
+prevent events from triggering bindings.
+
+9/9/93 (bug fix) Changed tkOption.c to always fetch RESOURCE_MANAGER
+property from root window of screen 0, rather than using default
+screen.
+
+9/9/93 (bug fix) Entry widgets weren't allocating quite enough width
+for themselves.  Fixed this and changed the size computation to match
+what's done for buttons and texts.
+
+9/16/93 (bug fix) Changed tkMain.c not to call exit C procedure directly;
+instead always invoke "exit" Tcl command so that application can redefine
+the command to do additional cleanup.
+
+-------------------- Release 3.3, 9/29/93 -------------------------
+
+9/30/93 (bug fix) Packer wasn't unmapping slaves when master got deleted.
+
+9/30/93 (bug fix) Binding event sequences such as <Right> were being
+misprinted as ASCII characters such as "S".
+
+10/6/93 (bug fix) Canvases weren't unmapping window items when the canvas
+got unmapped, which caused problems for window items whose windows weren't
+descendants of the canvas (they got left on the screen).
+
+10/7/93 (feature change) NULL proc arguments to Tk_CreateFileHandler used
+to have a special undocumented meaning (fd was display);  eliminated this
+special interpretation.
+
+10/7/93 (configuration change) Eliminated dependency of tkMain.c on
+tkInt.h and tkConfig.h, so that it's easier for people to copy the file
+out of the source directory to make modified versions.
+
+10/8/93 (bug fix) 3.0 introduced a bug where the class of the application
+wasn't being set properly, so options based on the application class
+weren't triggering.  Fixed by adding new argument to Tk_CreateMainWindow.
+
+10/11/93 (bug fix) Fixed bug in tkTextBTree.c where some deletions would
+cause core dumps due to halfwayLinePtr not getting set correctly.
+
+10/18/93 (bug fix) Fixed a couple of bugs that made it hard to actually
+display N characters in an entry with "-width N" (tended to scroll the
+entry so that only N-1 characters were visible at once).
+
+10/22/93 (bug fix) During configuration, XINCLUDE_DIR and XLIBRARY_DIR
+weren't overriding xmkmf like they were supposed to.
+
+10/23/93 (new feature) Allow negative scale factors in canvas "scale"
+widget command.
+
+10/23/93 (bug fix) Grabs weren't being cleaned up right if the grab
+window was deleted, causing core-dumps in some cases.
+
+10/23/93 (bug fix) tk_TextSelectTo wasn't checking to be sure that
+the "anchor" mark exists.
+
+10/27/93 (bug fix) Fixed core dump that could occur in a text widget if
+the scroll command modifies the text.
+
+11/1/93 (bug fix) Change texts so that the -yscrollcommand option is
+invoked at display time, not when the window is re-layed out.  This
+eliminated various core dumps that could occur if -yscrollcommand modified
+the text.
+
+-------------------- Release 3.4, 11/04/93 -------------------------
+
+Note: there is no 3.5 release.  It was flawed and was thus withdrawn
+shortly after it was released.
+
+11/12/93 (bug fix) TkMain.c didn't compile on some systems because of
+R_OK in call to "access".  Changed to eliminate call to "access".
+
+-------------------- Release 3.6, 11/26/93 -------------------------
+
+11/10/93 (bug fix) Packer and placer didn't always reposition a window
+correctly if it was managed inside a neice or lower descendant (using
+"-in" option) and the neice's parent moved.
+
+11/24/93 (bug fix) Fixed time problem in selection (retrievals could
+fail if retriever hasn't received any X events since selection was
+made, so that time of retrieval appears to be older than time of
+selection).  Selection code is now much less picky about times, both
+on retrieving and supplying sides.
+
+12/2/93 (new feature) Changed arrow-head drawing code for canvas
+lines to draw a 0-width outline in addition to filling the area:
+this produces much nicer, more symmetrical displays.
+
+12/2/93 (bug fix) When colors ran out, Tk was invoking "tkerror"
+when its state was internally inconsistent, which could cause
+core dumps in some situations (e.g. if tkerror used the same color
+that caused colors to run out).  Changed notification to occur
+as a when-idle handler.
+
+12/3/93 (bug fix) During a global grab, Tk wasn't including PointerMotion
+in the list of grabbed events, so pointer motion couldn't be tracked
+outside the grabbing application.
+
+12/3/93 (bug fix) Canvases didn't handle smoothed lines correctly
+when they only contained two points.
+
+12/3/93 (bug fix) Fixed bug in tkWindow.c where certain kinds of
+errors during window creation could cause Destroy events to be generated
+for a window that was never completely initialized.
+
+12/13/93 (bug fix) Fixed bug in tkTextDisp.c that resulted in core
+dumps at line 1467 under exmh.  The exact situation is that a text
+widget was being redisplayed at a time when it had a -yscrollcommand
+option but hadn't yet been mapped onto the screen.
+
+12/17/93 (bug fix) Fixed bug in tkWindow.c whereby new top-level windows
+with non-default visuals still inherited border pixmap from parent (root),
+which could cause visual clash and X error.
+
+12/17/93 (bug fix) Fixed bug in tkTextDisp.c that caused round-off
+error in the information passed to scroll commands.
+
+12/18/93 (bug fix) Fixed bug in tkPack.c that caused core dumps in
+some situations if a master with siblings packed "-in" it was deleted.
+
+12/18/93 (bug fix) Added "compat" directory to distribution, since it's
+referenced by tkConfig.h on some systems.
+
+12/18/93 (performance improvement) Improved performance of appending to
+a listbox, so that inserting N items doesn't take N**2 time.
+
+12/20/93 (bug fix) Fixed bug in canvas ovals that caused the fill color
+for the oval to stick out past the outline.
+
+1/2/94 (fixed Xlib bug) Added code to reuse X resource identifiers so
+that they won't run out in long running applications.  There are three
+new library procedures: Tk_FreeXId, Tk_GetPixmap, and Tk_FreePixmap.
+Modified all Tk code to use these procedures, so wish applications should
+now be able to run forever without running out of identifiers.
+
+1/10/94 (bug fix) tkCursor wasn't freeing pixmaps used to create
+cursors, which caused memory leaks in programs that changed cursors
+frequently.
+
+1/21/94 (bug fix) Fixed bug in scales that caused them to loop
+infinitely drawing tick-marks when -from and -to were the same.
+
+2/2/94 (bug fix) Fixed problem where messages that contained tabs
+didn't always compute the correct size, so that text spilled off
+the right edge.  The fix adds an extra "tabOrigin" parameter to
+the internal procedures TkMeasureChars, TkDisplayChars, and
+TkUnderlineChars.
+
+2/4/94 (bug fix) Fixed off-by-one problem in tkBind.c that caused
+it to read past the initialized part of dispPtr->modKeyCodes.
+
+2/7/94 (bug fix) Text widgets didn't handle grabs correctly, such
+that the "current" character got stuck if a grab occurred while a
+mouse button was down.  It would get unstuck until after the
+next button press and release.
+
+2/19/94 (bug fix) Fixed prolog.ps (prolog for Postscript printing from
+canvases) so that it correctly prints all of the characters in the
+ISO Latin-1 character set.
+
+2/19/94 (bug fix) Modified tkBind.c to save and restore the interpreter's
+result across the execution of binding scripts.  Otherwise if an event
+triggers in the middle of some other script (e.g. a destroy event during
+window creation, because there was an error in the creation command),
+the intepreter's result gets lost.
+
+2/19/94 (bug fix) Fixed bug in dealing with results of sent command
+that could cause them to get lost in some situations.
+
+2/21/94 (bug fix) Don't let user close a dialog window created by
+tk_dialog, since this would cause tk_dialog to hang:  force the user
+to select one of the dialog's buttons.
+
+2/21/94 (bug fix) Fixed bug in canvas polygons whereby they didn't
+correctly handle changes in the number of points (via "coords"
+widget command).
+
+2/23/94 (bug fix) Large bitmaps in canvases didn't print correctly
+because they overflowed the 64-KB limit on strings in Postscript.
+Changed canvas printing to split up large bitmaps into mutliple
+smaller ones for printing.
+
+2/25/94 (bug fix) The "." window was being set up with -width
+and -height options, which interfered with geometry management (any
+configuration change on "." causes the window to change size to
+200x200, then change back again).
+
+2/26/94 (bug fix) Fixed several bugs that occurred when a Destroy
+event handler for a window deleted the window's parent.
+
+3/3/94 (new features) Changes to binding mechanism:
+    - The modifiers for "Alt", "Meta", and "M" are now computed by
+      examining the modifier map, rather than being hardwired to
+      M2, M1, and M1.
+    - When processing events, one script is invoked for each object
+      in the list passed to Tk_BindEvent, rather than stopping as
+      soon as a script is invoked for some object.  The "break" and
+      "continue" commands can be used within a script to abort all
+      scripts for the event or the current one.
+      *** POTENTIAL INCOMPATIBILITY ***
+    - Added "bindtags" command so that new binding groups can be
+      defined for widgets and the evaluation order can be changed.
+    - When matching events to bindings, extra modifiers are now ignored,
+      as if "Any" were specified for every event.  The "Any" modifier
+      is still recognized, but it is ignored and is deprecated.
+      *** POTENTIAL INCOMPATIBILITY ***
+    - In % sequences that print window identifiers (e.g. %a and %S), print
+      in hexadecimal rather than decimal, for consistence with "winfo id".
+      *** POTENTIAL INCOMPATIBILITY ***
+    - The "bind" command no longer supports the event types CirculateRequest,
+      ConfigureRequest, MapRequest, or ResizeRequest.  These event types
+      are somewhat dangerous, and they never worked anyway.
+
+3/13/94 (bug fix) Fixed numerous problems with the "wm iconwindow" command.
+It appears that this command never really worked at all, but it should
+work OK now.
+
+3/14/94 (feature changes) Removed several obsolete features:
+    - Eliminated "enable" and "disable" widget commands for menus.
+      *** POTENTIAL INCOMPATIBILITY ***
+    - Eliminated "activate" and "deactivate" widget commands for buttons,
+      checkbuttons, radiobuttons, and menubuttons.
+      *** POTENTIAL INCOMPATIBILITY ***
+    - Removed -geometry option for frames and toplevels:  it causes
+      problems when .Xdefaults files contain entries like
+      "*geometry: +0+0".  Must use -width and -height instead.
+      *** POTENTIAL INCOMPATIBILITY ***
+    - Desupported "tkVersion" variable: use "tk_version" instead.
+      *** POTENTIAL INCOMPATIBILITY ***
+
+3/16/94 (feature changes) Changes to listboxes:
+    - Eliminated -geometry option (it causes problems when .Xdefaults
+      files contain entries like "*geometry: +0+0").  Added -width
+      and -height options to use instead.
+      *** POTENTIAL INCOMPATIBILITY ***
+
+3/21/94 (bug fix) Fixed bug in tkOption.c where the option cache wasn't
+properly cleaned up after window deletion;  this could cause the wrong
+value from the option database to be used under some conditions.
+
+3/25/94 (new features) Changes to geometry management:
+    - Added Tk_MaintainGeometry and Tk_UnmaintainGeometry procedures
+      to solve problems with -in windows.  Modified the packer, the
+      placer, and canvases to use them.
+    - Changed 2nd argument to Tk_ManageGeometry from Tk_GeometryProc *
+      to a pointer to a structure with additional information about
+      the geometry manager, such as name and procedure to call when
+      slaves are stolen.
+      *** POTENTIAL INCOMPATIBILITY ***
+
+3/28/94 (new feature) Overhauled event management:
+    - Added "cancel" option to the "after" command so that you can
+      cancel previously-scheduled commands.
+    - Separated X-specific stuff from generic event management.  The
+      file tkEvent.c can now be used stand-alone without the rest of Tk.
+      See the manual entry for Tk_EventInit for information on which
+      procedures are available this way.
+    - Added Tk_CreateFileHandler2 procedure, which provides a lower-level
+      and more powerful form of file event handler.
+    - Fixed bug in Tk_DoOneEvent where an infinite loop could occur if
+      the TK_FILE_EVENT and TK_DONT_WAIT flags were set simultaneously
+      (there were bugs with several other combinations too;  all should
+      be fixed now).
+
+3/28/94 (new feature) Added "fileevent" command, which allows event-
+driven I/O in the style of Mark Diekhans' "addinput" command.
+
+4/11/94 (new feature) Better support for colormaps and visuals:
+    - Added new -colormap and -visual options to toplevels and frames.
+    - Added "winfo visualsavailable" command.
+    - Added "wm colormapwindows" command, plus support for WM_COLORMAP_WINDOWS
+      to Tk_SetWindowColormap.
+    - Added new library procedures Tk_GetVisual, Tk_GetColormap,
+      and Tk_FreeColormap.
+
+4/11/94 (bug fix) Fixed core dump that used to occur when specifying
+an iconwindow ("wm iconwindow") for a toplevel on a different screen
+than the main window.
+
+4/23/94 (new feature) Added support for images, including the following:
+    - New "image" command for creating images.
+    - Built-in image type: bitmap.
+    - New "image" item type in canvases.
+    - Labels, buttons, checkbuttons, radiobuttons, menubuttons, and
+      menu entries now support a -image option for displaying images.
+    - Tk_CreateImageType and Tk_ImageChanged procedures, for defining
+      new types of images in C.
+    - Tk_GetImage, Tk_FreeImage, Tk_RedrawImage, and Tk_SizeOfImage
+      procedures, for using images in widgets.
+
+5/1/94 (new features) Added new procedures Tk_3DVerticalBevel and
+Tk_3DHorizontalBevel.
+
+5/11/94 (new features) Major overhaul of text widgets:
+    - Implemented embedded windows and "window" widget command.
+    - Added new configuration options for tags: -justify, -lmargin1,
+      -lmargin2, -rmargin, -offset, -spacing1, -spacing2, and -spacing3.
+      See the "Display styles" widget demo for examples.
+    - Added new configuration options for texts: -spacing1, -spacing2,
+      and -spacing3.
+    - Added "tagList" option to "insert" widget command to control
+      tags on new text.  Made tagged regions so they aren't sticky on
+      either side:  new characters get a tag only if the old chars. on
+      both sides had it.
+      *** POTENTIAL INCOMPATIBILITY ***
+    - Added gravity for marks, and "mark gravity" widget command.
+    - Added horizontal scrolling, "xview" widget command, -xscrollcommand
+      option.  Changed "scan" widget commands to support horizontal
+      scrolling.
+      *** POTENTIAL INCOMPATIBILITY ***
+    - Added "search" widget command for searching (either exact matches
+      or regular expressions).
+    - New widget commands: bbox, dlineinfo, and see.
+    - Changed implementation of bindings so that Enter and Leave
+      events are not generated unless the tag has just become present
+      (or just ceased to be present) on the current character.  Also
+      changed bindings to process separately for each tag, rather than
+      having high-priority tags override low-priority ones.
+    - The "end" index now refers to the character after the last newline
+      rather than the newline itself.  You can now tag the final newline
+      and set a mark after the final newline.
+    - Deletions of the "sel" tag and the "insert" and "current" marks
+      are now ignored silently, rather than generating errors.  This means
+      you can do things like "eval .t tag delete [.t tag names]".
+
+5/19/94 (bug fix) Canvases didn't generate proper Postscript for stippled
+text.
+
+5/20/94 (new feature) Added "bell" command to ring the display's bell.
+
+5/20/94 (new feature) Incorporated "square" demonstration widget into
+tktest application.
+
+5/20/94 (new features) Changed wish application (tkMain.c):
+    - wish no longer processes the -help option.
+      *** POTENTIAL INCOMPATIBILITY ***
+    - The wish main program is now called Tk_Main;  tkAppInit.c has a
+      "main" procedure that calls Tk_Main.  This makes it easier to use
+      Tk with C++ programs, which need their own main programs, and it
+      also allows an application to prefilter the argument list before
+      calling Tk_Main.
+      *** POTENTIAL INCOMPATIBILITY ***
+    - The application's class is now the same as its name (except the
+      first letter is capitalized), instead of "Tk".
+      *** POTENTIAL INCOMPATIBILITY ***
+    - The -file keyword is no longer required:  the script file name can
+      be provided as the first argument without being preceded by "-file",
+      as in tclsh.  For backward compatibility the "-file" keyword is
+      ignored if it is the first argument, but it is deprecated.
+
+5/26/94 (feature removed) Removed support for "fill" justify mode from
+Tk_GetJustify and from the TK_CONFIG_JUSTIFY configuration option.  None
+of the built-in widgets ever supported this mode anyway.
+*** POTENTIAL INCOMPATIBILITY ***
+
+5/27/94 (feature change) Changed Tk to use Tk_PrintDouble everywhere
+that it converts reals to strings.  This means that floating-point
+values will be generated in some cases where integer-like values were
+generated before.
+*** POTENTIAL INCOMPATIBILITY ***
+
+6/1/94 (feature change) Renamed "pack newinfo" command to "pack info".
+The old "pack info" command is no longer available.
+*** POTENTIAL INCOMPATIBILITY ***
+
+6/20/94 (feature changes) Overhaul of entry widgets:
+    - Added "-justify" option.
+    - Added "-show" option to make entries easier to use for passwords.
+    - Added "cget" widget command.
+    - Added "selection range" and "selection present" widget commands.
+    - Added "anchor" symbolic index.
+    - Changed "-scrollcommand" option to "-xscrollcommand", "view"
+      widget command to "xview", for compatibility with other widgets.
+      *** POTENTIAL INCOMPATIBILITY ***
+    - Changed sel.last to refer to character just *after* last one
+      selected, again for compatibility with other widgets.
+      *** POTENTIAL INCOMPATIBILITY ***
+    - For "delete" widget command, second index now refers to character
+      just *after* last one to delete.
+      *** POTENTIAL INCOMPATIBILITY ***
+    - Overhauled bindings to be more Motif-compatible and to include
+      common Emacs bindings for editing.
+    - Changed -width option:  if specified as 0, widget sizes to fit
+      its current text.
+
+6/11/94 (new features) Improved Motif compatibility:
+    - Added "-highlightwidth" and "-highlightcolor" options to all widgets.
+
+6/27/94 (bug fix) Postscript generation for text items in canvases was
+not justifying the text properly when a -width was specified that was
+longer than the longest line.
+
+6/27/94 (bug fix) "winfo exists" used to report a window as existing
+if it was in the process of being destroyed (i.e., a destroy handler
+is in the middle of execution).  Changed to report it as non-existent
+under these conditions.
+*** POTENTIAL INCOMPATIBILITY ***
+
+7/11/94 (bug fix) Selections claimed via "selection own" weren't always
+being cleared properly when the selection was claimed away.  Also fixed
+bug where Tk wasn't properly claiming the selection, if there haven't
+been any recent X events at the time of the claim.
+
+7/13/94 (feature changes) Overhaul of scrollbar widgets:
+    - New widget commands: "activate", "cget", "fraction", and "identify".
+    - New options: -activebackground, -activerelief, -highlightcolor,
+      -jump, -highlightthickness, and -troughcolor.  What used to be
+      -background is now -troughcolor, -foreground is now -background,
+      and -activeforeground is now -activebackground.
+      *** POTENTIAL INCOMPATIBILITY ***
+    - Added new syntax for "set" command, "get" result, and generated
+      commands.  Changed other widgets to use the new syntax.
+    - Moved the bindings out of C and into Tcl scripts, using the new
+      options and widget commands.  Added support for all Motif
+      bindings, plus jump scrolling and cancelling of slider drags.
+
+7/16/94 (bug fix) Canvases assumed that the Leave event for one item
+didn't modify or delete the next current item;  this could cause core
+dumps under some conditions.
+
+7/23/94 (feature change) Modified Tk_BackgroundError so that tkerror
+is invoked as an idle handler.  If tkerror generates a break exception
+then all other queued reports are aborted.
+
+8/14/94 (bug fix) "cursorOffTime" and "cursorOnTime" were confused in
+canvases, resulting in the same time being used for both.
+
+8/16/94 (bug fix) "tkwait variable" command didn't detect errors in
+variable name, such as trying to wait for an entire array.
+
+9/2/94 (new features) Overhaul of scale widgets:
+    - Floating-point values are supported now, following Paul Mackerras'
+      "fscale" widget.  Added "-resolution" and "-digits" options.
+    - Added "-variable" option to link scale to variable, following
+      Henning Schulzrinne's implementation.
+    - Added focus highlight (-highlightthickness and -highlightcolor
+      options).
+    - Added new widget commands "cget",  "coords", "identify", plus
+      improved "get";  removed wired-in bindings, added complete set
+      of Motif bindings via Tcl scripts.
+    - Changed -sliderforeground option to -background, -background to
+      -troughColor, -activeforeground to -activebackground.
+      *** POTENTIAL INCOMPATIBILITY ***
+    - Moved value label from below horizontal scales to above the scale,
+      for Motif compliance.
+
+9/9/94 (bug fix) Fixed bug in tkWm.c that caused long delays in "raise"
+command under some conditions (window already at the top of the stack).
+
+9/10/94 (new features) Overhaul of label/button/checkbutton/radiobutton
+widgets:
+    - Added focus highlight (-highlightthickness and -highlightcolor
+      options).
+    - Added new widget command "cget".
+    - Changed -selector option to -selectcolor, and changed its meaning
+      too: empty no longer means don't draw the indicator;  it means
+      don't use a special color when selected.
+      *** POTENTIAL INCOMPATIBILITY ***
+    - Added -indicatoron (controls whether indicator is displayed) and
+      -selectimage (gives special image to display when selected) options.
+    - Modified bindings to be more Motif-like, added binding for space
+      key.
+    - Changed padding defaults to give widgets correct Motif appearance
+      by default.  Also, changed to ignore padding options when displaying
+      an image or bitmap.
+      *** POTENTIAL INCOMPATIBILITY ***
+    - Can now display text on multiple lines:  newlines cause line breaks,
+      and word wrapping can be requested with -wraplength option.  Also
+      added -justify and -underline options.
+    - The -value option for radiobuttons can now have an empty string as
+      its value;  it no longer defaults to the name of the widget.
+      *** POTENTIAL INCOMPATIBILITY ***
+
+9/13/94 (new features) Modified both canvases and messages to support
+-highlightthickness and -highlightcolor options plus "cget" widget
+command.
+
+9/19/94 (new features) Added Tk_UnsetGrid procedure, modified widgets
+to use it.  Also changed Tk_SetGrid so that at most one window per
+toplevel can have gridding enabled.
+
+9/23/94 (new features) Major overhaul of listbox widgets:
+    - Added focus highlight (-highlightthickness and -highlightcolor
+      options).
+    - Added new widget command "cget".
+    - Revised selection commands to support single selections as well
+      as multiple disjoint selections;  syntax of "selection" widget
+      command has changed to support this.  Added new option -selectmode
+      for specifying which mode to use.  Default is single selection;
+      tk_listboxSingleSelect procedure no longer exists.  Selections
+      now return as items separated by newlines instead of a list whose
+      elements are the items.
+      *** POTENTIAL INCOMPATIBILITY ***
+    - Extended "get" widget command to allow many items to be retrieved
+      at once.
+    - Added "bbox" widget command for finding position of an element on
+      screen.
+    - Added "activate" command to mark element with traversal focus.
+    - Extended index mechanism to support new types of indices:
+      "active", "anchor", "@x,y".
+    - Added "see" widget command.
+    - Revised bindings to include all Motif features except for AddMode.
+    - If -width or -height option is <= 0, the widget requests a size just
+      large enough to hold all of its text.
+
+10/6/94 (new features) Overhaul of menubuttons:
+    - Added focus highlight (-highlightthickness and -highlightcolor
+      options).
+    - Added new widget command "cget".
+    - Added -indicatoron option to display option menu indicator.
+    - The -menu option must be a child of the menubutton.
+      *** POTENTIAL INCOMPATIBILITY ***
+
+10/6/94 (new features) Overhaul of menu widgets:
+    - Added new widget commands "cget" and "entrycget".
+    - Changed the implementation of tear-off menus to be more
+      Motif-like;  added -tearoff option for specifying whether
+      tearoff entry is displayed.
+    - Changed interpretation of "@y" index:  it now returns the
+      closest entry, rather than "none" if y is outside the menu's
+      range.
+      *** POTENTIAL INCOMPATIBILITY ***
+    - The -menu option for a cascade entry must now be a child of
+      the menu.
+      *** POTENTIAL INCOMPATIBILITY ***
+    - Added "type" widget command, so that you can query the type of
+      an entry.
+    - Added -foreground, -activeforeground, -selectcolor, -indicatoron,
+      -image, and -selectimage options to menu entries.
+    - Changed "selector" menu option to "selectColor" for Motif compliance.
+      *** POTENTIAL INCOMPATIBILITY ***
+    - Added -relief option for menus, just for consistency with other
+      widgets (it was implicitly "raised" before).
+
+10/6/94 (feature change) Completely overhauled the bindings for menus
+and menubuttons.  They now fit better with other Tk 4.0 facilities,
+such as the new binding mechanism, and they provide better Motif
+compliance (e.g. keyboard traversal of submenus).  Also, the bindings
+now support option menus, popup menus, and proper Motif tear-off
+menus.
+
+10/6/94 (obsolete features) The procedures tk_menuBar and
+tk_bindForTraversal are no longer needed in Tk 4.0.  They still exist
+for compability, but they do nothing.
+
+10/6/94 (new procedures) Added "tk_popup" procedure for posting a
+popup menu, and "tk_optionMenu" for creating an option menubutton
+and its associated menu.
+
+10/6/94 (change in name) The variable "tk_priv" has been renamed
+to "tkPriv" to reflect that fact that it is private to Tk now.
+This shouldn't cause any problems, since no-one except Tk should
+have been using it before anyway (right?).
+
+10/6/94 (bug fix) Fixed bug in texts where sometimes the text would
+stop tracking mouse motion (the "current" item wouldn't get updated)
+because the text widget missed a ButtonRelease event.
+
+10/20/94 (new features) Overhauled selection code to support multiple
+selections (primary, secondary, etc.) and multiple displays:
+    - Changed "selection" command to support new options such as
+      "-displayof" and "-selection".  Old command formats are still
+      supported for compatibility, but they are no longer documented
+      and are deprecated.
+    - Changed procedures Tk_GetSelection, Tk_CreateSelHandler, and
+      Tk_ClearSelection to take additional "selection" argument.
+      *** POTENTIAL INCOMPATIBILITY ***
+    - Selection targets APPLICATION and WINDOW_NAME have been replaced
+      by TK_APPLICATION and TK_WINDOW.
+      *** POTENTIAL INCOMPATIBILITY ***
+
+10/20/94 (new features) Added support for clipboard:
+    - New "clipboard" command.
+    - C procedures Tk_ClipboardClear and Tk_ClipboardAppend.
+    - Bindings for "cut", "paste", and "copy" for text and entry widgets,
+      plus "copy" binding for listboxes.
+
+10/24/94 (bug fix) Button widgets weren't checking for errors when
+setting the values of associated variables.
+
+11/3/94 (bug fix) Fixed bug whereby Tk would hang if "exit" was invoked
+from inside a <Destroy> binding.
+
+11/15/94 (new features) Overhaul of focus mechanism:
+    - Added support for multiple displays:  separate focus windows are
+      kept for each display.
+    - Added support for keyboard traversal.
+    - Changed focus model so Tk keeps track of a focus window for each
+      top-level window and automatically sets the focus on Enter to the
+      top-level.  Tk no longer synthesizes FocusIn and FocusOut events,
+      but just uses the standard X mechanisms.  There is no "default"
+      focus window anymore; the focus reverts to top-levels by default.
+      *** POTENTIAL INCOMPATIBILITY ***
+    - Changed focus command:  eliminated "focus default" and "focus none",
+      added "-displayof" and "-lastfor" options.  An empty string is now
+      used to signify "no focus" instead of "none".
+      *** POTENTIAL INCOMPATIBILITY ***
+    - Added library procedures tk_focusNext, tk_focusPrev, and
+      tk_focusFollowsMouse.
+    - Removed obsolete Tk_CreateFocusHandler:  must use FocusIn and
+      FocusOut events now.
+      *** POTENTIAL INCOMPATIBILITY ***
+
+11/23/94 (new features) Overhaul of "send" command:
+    - Added support for multiple displays: -displayof option to "send".
+    - Added asynchronous sends: -async option to "send".
+    - Eliminated fixed timeouts on sends:  as long as the target
+      application appears to exist, the send will wait for it.
+    - Stale entries get removed from the application registry now,
+      so "winfo interps" should never return non-existent applications.
+    - Can change the name of an application with "tk appname" command.
+      This is also the preferred way of querying the application name
+      now.
+    - The errorCode and errorInfo variables are now propagated back to
+      the sender now, so a full stack trace is available.
+    - Tk checks display security on each send now, instead of just during
+      initialization, so changes in the security status are seen immediately
+      by all applications.
+    - The above changes required changes to the data formats used for
+      communication between source and target applications, so Tk 4.0
+      applications cannot send to, or be sent from, Tk 3.6 applications.
+      *** POTENTIAL INCOMPATIBILITY ***
+    - The procedure Tk_RegisterInterp has been replaced with Tk_SetAppName.
+      *** POTENTIAL INCOMPATIBILITY ***
+
+12/6/94 (cleanup) Eliminated "interp" argument to Tk_GetColorByValue,
+since it is no longer needed.
+*** POTENTIAL INCOMPATIBILITY ***
+
+12/7/94 (feature change) Changed the "wm" command so that top-level
+windows are now resizable by default.  You can no longer specify
+empty arguments to "wm maxsize" and "wm minsize".
+*** POTENTIAL INCOMPATIBILITY ***
+
+12/8/94 (new feature) Added new "photo" image type using code provided
+by Paul Mackerras:  currently supports only PPM "P6" format images.
+
+12/14/94 (new features) Canvas modifications:
+    - Modified the interfaces between generic canvas code and the item
+      types so that it's easy for people to write new item types outside
+      of Tk.
+    - Added support for transparent bitmap items:  just specify an
+      empty string as the background color.
+    - Changed the "xview" and "yview" commands for canvases to use the
+      new scrolling syntax.
+    - Eliminated -scrollincrement option.
+      *** POTENTIAL INCOMPATIBILITY ***
+
+12/14/94 (bug fix) Fixed bug where the dimensions of canvas arrowheads
+scaled during a "scale" widget command, but the scaling was only
+temporary and got lost on the next re-configure of the item.  The
+correct behavior is for the arrowheads not to scale.
+
+-------------------- Release 4.0b1, 12/23/94 -------------------------
+
+12/26/94 (bug fix) Removed obsolete demos from Makefile (color, dialog,
+size), fixed "install" target.
+
+1/3/95 (bug fix) Fixed all procedure calls to explicitly cast arguments:
+implicit conversions from prototypes don't work when compiling under
+non-ANSI compilers.  Tk is now clean under gcc -Wconversion.
+
+1/4/95 (bug fix) Used "screenX" without ever setting it in DisplayText
+in tkCanvText.c:  caused tabs in canvas text items to get messed up.
+
+1/4/95 (bug fix) Canvases forgot to register the built-in types if
+Tk_CreateItemType was called before a canvas widget was created.
+
+1/4/95 (bug fixes) Fixed glitches in various text bindings:
+    - Up used to do nothing if the cursor was at 2.0.
+    - Right used to make the cursor invisible if it was just before
+      the final newline of the text.
+    - Control-t didn't conform to Emacs;  made it conform to GNU Emacs.
+    - Deleted Control-x binding, since it doesn't conform to anything and
+      is confusing for Emacs users.
+
+1/4/95 (bug fixes) Changed Control-t for entries just as for texts (see
+above) an deleted Control-x for entries (see above).
+
+1/4/95 (bug fix) The packer didn't map slaves unless the master was mapped;
+this could cause slaves to get "lost" so that they weren't mapped until the
+master resized.
+
+1/5/95 (bug fix) Scrollbars weren't executing the proper code the first time
+the mouse entered the widget;  this caused problems if tk_strictMotif was
+set.
+
+1/6/95 (bug fix) Fixed label/button/checkbutton/radiobutton/menubutton
+widgets to allow arbitrary screen distances when specifying -width and
+-height for an image or bitmap (the manual pages already documented this
+but the code didn't implement it).
+
+1/6/95 (new feature) Added very primitive support for input methods,
+as suggested by Martin Forssen.  This should be enough for European
+character sets (Compose key) but it isn't near enough for Asian
+character sets.
+
+1/8/95 (bug fix) Fixed problem in canvas "xview" and "yview" commands
+where divide-by-zero errors could sometimes occur.
+
+1/8/95 (bug fix) New event handler didn't properly handle files for
+which both TK_READABLE and TK_WRITABLE were specified.
+
+1/11/95 (bug fix) Fixed bug with text selections:  was returning count
+too high for data, causing bogus garbage to appear when selection was
+copied.
+
+-------------------- Release 4.0b2, 1/12/95 -------------------------
+
+1/27/95 (feature removal) Removed %D substitution from binding scripts:
+wasn't portable, shouldn't be used anyway.
+*** POTENTIAL INCOMPATIBILITY ***
+
+1/27/95 (new features) Added -displayof options to the commands
+"winfo atom", "winfo atomname", "winfo containing", "winfo interps",
+and "winfo pathname".
+
+1/27/95 (new feature) Added "idle" option to "after" command to run
+scripts as idle handlers.
+
+1/28/95 (new feature) Modified placer to make -x and -relx additive
+if you specify both.  Same for -y and -rely, -width and -relwidth,
+and -height and -relheight.  This makes it easy to make request such
+as "make .a 2 pixels larger than .b".
+*** POTENTIAL INCOMPATIBILITY ***
+
+1/28/95 (new feature) Improved auto-grab mechanism in canvases (which
+prevents current item from changing while a button is down):  changed
+to report Enter and Leave events for the current item while a button
+is down.  However, as before, no Enter events are reported for other
+items until the button goes up.
+
+1/28/95 (new feature) Bitmap images are now transparent if the -background
+is specified as an empty string (-maskdata and -maskfile are ignored in
+this case).  This is also the default.
+
+1/28/95 (bug fix) Tk didn't support manufacturer- or site-specific keysyms
+such as SunAudioMute.  Modified tkBind.c so that it uses XStringToKeysym
+in addition to its own hash table, so that all keysyms are now available.
+
+1/30/95 (feature change) Modified "clipboard append" so that it reclaims
+the clipboard selection if it had been previously lost, rather than just
+generating an error.  This handles certain race conditions more cleanly,
+and also allows the use of programs like "xclipboard".
+
+1/30/95 (new feature) Added -xscrollincrement and -yscrollincrement
+options to canvases.
+
+1/31/95 (bug fix) Geometry management was broken if a particular geometry
+manager claimed a slave away from itself.
+
+1/31/95 (bug fix) Fixed bug in tkVisual.c where a visual with fewer bits
+than requested was being selected in preference to one with just the right
+number of bits.
+
+1/31/95 (bug fix) Texts weren't redisplaying the padding region properly
+after changes in -padx or -pady.
+
+1/31/95 (new features) More text improvements:
+    - Extended "insert" widget command for texts to allow multiple
+      text-tagList pairs in the same command.
+    - Added -nocase option to "search" widget command.
+    - Added -overstrike option to tags.
+    - Added tab stops, via -tabs option for widget and for tags.
+
+2/10/95 (bug fix) Modified all widgets to allow renaming of widget
+commands.  Deleting a widget command will delete the widget.
+
+2/11/95 (new feature) Added -highlightbackground option to all widgets.
+
+2/14/95 (new feature) Added "insert" widget command for menus.
+
+2/15/95 (new feature) Modified text display code (for all widgets) to
+display well-known control characters like newline and backspace as
+\n or \b instead of \xa.
+
+2/15/95 (bug fix) Modified bitmap and photo image managers to delete
+the image command when the image is deleted.  Also modified them to
+allow renaming of the image command, and to delete the image if the
+image command is deleted.
+
+2/15/95 (bug fix) Fixed text widgets to allow horizontal scrolling
+even if wrapping was enabled, if a line isn't entirely visible due to
+a large character or embedded window.
+
+2/16/95 (feature change) Added "postcascade" widget command to menus,
+changed "invoke" and "activate" not to post or unpost submenus.  Also
+fixed bug in redisplay that tended to leave bits of garbage on menu
+when submenu unposted.
+*** POTENTIAL INCOMPATIBILITY ***
+
+2/16/95 (feature removal) Removed "snap back" behavior (slider
+snaps back to old position if you move the mouse outside the widet
+before releasing the button) from scrollbars and scales.
+
+2/16/95 (bug fix) The last line of a listbox wasn't being displayed if
+it was only partially visible.
+
+2/16/95 (new features) Added support for "-resolution 0" (no rounding
+of values) to scale widgets, plus smarter computation of how many digits
+to display.
+
+2/17/95 (bug fix) Fixed bug in text bindings for things like Shift-Left:
+didn't properly set the anchor position.
+
+2/20/95 (bug fix) Changed management of COLORMAP_WINDOWS property to
+add the toplevel implicitly to the end of the list if it wasn't already
+on the list somewhere.  Without this, some window managers implicitly
+put it at the front of the list, so that colormaps in internal windows
+are never used.
+
+2/20/95 (bug fix) Changed to use separate command procedures for
+button, checkbutton, label, and radiobutton commands.  This allows the
+class commands to be renamed without breaking their behavior.
+
+2/20/95 (removed feature) The "bind" command no longer supports
+"Keymap" events;  they never worked anyway.
+
+2/20/95 (bug fix) The text "search" widget command looped infinitely
+when searching an empty text.
+
+2/20/95 (bug fix) Canvases weren't redrawing their borders after
+configuration changes.
+
+2/20/95 (upgrade) Changed to use autoconf version 2.2.
+
+2/21/95 (bug fix) Fixed several bug fixes in menu bindings that occur
+when menus have no entries.
+
+2/21/95 (bug fix) Fixed bug in geometry management that caused windows
+packed -in siblings to not always be mapped and unmapped properly
+(particularly when the toplevel got unmapped and mapped).
+
+2/22/95 (bug fix) Fixed resource leak problem in tkTextDisp.c that
+caused embedded windows not to be unmapped when off-screen.
+
+2/23/95 (bug fix) "After cancel" dumped core when the script for an
+after event cancelled itself.
+
+2/24/95 (bug fix) Text and entry widgets weren't properly ignoring
+Alt-, Control-, and Meta- keystrokes, so a widget-specific binding
+for one of these resulted in the character also being inserted.
+
+2/24/95 (bug fix) Several widgets accidentally performed unsigned
+division on negative numbers, thereby losing the sign bit.  This
+mostly affected the display of images and bitmaps in buttons,
+menubuttons, and messages.
+
+2/24/95 (feature reversal) Restored old behavior of %A so that it
+returns non-printing characters as well as printing ones now.
+*** POTENTIAL INCOMPATIBILITY with Tk 4.0b2, but not with Tk 3.6 ***
+
+2/24/95 (bug fix) Duplicate "leave" events could occur for canvas
+items under some conditions, due to recursive calls to PickCurrentItem.
+Added code to detect and skip the nested calls.
+
+2/24/95 (bug fix) Fixed bug where an error could occur during the first
+keystroke in an application if its binding invoked "break".
+
+2/25/95 (new feature) Modified syntax of "search" widget command for
+texts.  The -nowrap switch and the "variable" final argument are no
+longer supported.  Instead, there is a -count switch to replace
+the final argument;  if the final argument is specified, it is now
+a stopping index for the search.  The features of -nowrap can be
+achieved now with the stopping index.
+*** POTENTIAL INCOMPATIBILITY with Tk 4.0b2, but not with Tk 3.6 ***
+
+2/27/95 (bug fix) Fixed problem that appears to prevent keyboard
+input for working under IRIX:  tkBind.c was ignoring XmbLookupString
+calls that returned a status of XLookupBoth.
+
+2/27/95 (new feature) Added Tk_GetItemTypes procedure to return
+information about available canvas item types.
+
+2/27/95 (feature change) Changed Makefile to always use install-sh
+for installations:  there's just too much variation among "install"
+system programs, which makes installation flakey.
+
+2/27/95 (bug fix) Fixed bug in tkSend.c that caused core dumps if
+the app's main window was destroyed by a destroy handler on a
+child.
+
+3/5/95 (feature change) Change separator character used in "bind +..."
+bindings from semi-colon to newline (permits bindings that are
+comments, for what that's worth).
+
+3/7/95 (bug fix/feature change) Overhauled focus code, both in C
+and in Tcl:
+    - Tk won't move the X focus in response to the "focus" command
+      unless either the application already has the focus or the
+      -force switch is specified.
+    - Tk no longer sets the X focus to anything other than top-levels;
+      it synthesizes events for FocusIn and FocusOut to children.
+    - A window no longer has to be viewable when focussed to;  Tk will
+      set the X focus later, when the window becomes viewable.
+    - Added -takefocus option to all widgets.
+    - Rewrote tk_focusPrev and tk_focusNext to use the -takefocus option.
+      These procedures no longer set the focus;  they just return the
+      next window in focus order.
+      *** POTENTIAL INCOMPATIBILITY with Tk 4.0b2, but not with Tk 3.6 ***
+    - Eliminated tk_focusContinue.
+      *** POTENTIAL INCOMPATIBILITY with Tk 4.0b2, but not with Tk 3.6 ***
+
+3/8/95 (new feature, bug fix) Added support for tk_strictMotif variable
+in C:  Tk_StrictMotif library procedure.  Modified buttons, menubuttons,
+menus to use it.  This fixes the problem with menus not supporting
+tk_strictMotif properly in Tk4.0b1 and b2.
+
+3/16/95 (feature overhaul) Overhauled color management:
+    - Changed Tk so it never denies a color request because a colormap
+      filled up.  Instead, it allocates the closest available color.
+    - Eliminated "color model" mechanism.  The "tk colormodel" command
+      is gone, as are the procedures Tk_GetColorModel and Tk_SetColorModel.
+      *** POTENTIAL INCOMPATIBILITY ***
+    - Changed 3D border implementation to allocate colors for shadows
+      lazily, so they're never allocated if they're never used.  Also
+      added new feature whereby stippling is used for borders when
+      the colormap has run out of entries.  Changed arguments to many
+      of Tk_3D C procedures to take a Tk_Window as argument instead of
+      a (Display *).  This is needed to do lazy color allocation.
+      *** POTENTIAL INCOMPATIBILITY ***
+    - Eliminated colormap argument to Tk_GetColor, Tk_GetColorByValue,
+      and Tk_Get3DBorder.
+      *** POTENTIAL INCOMPATIBILITY ***
+
+3/16/95 (feature change) Event bindings created from Tcl will now ignore
+Enter, Leave, FocusIn, and FocusOut events with detail NotifyInferior.
+This is done in anticipation of mega-widgets, so that the user of a
+mega-widget can create Enter/Leave bindings on the mega-widget without
+seeing spurious events as the mouse moves among the windows in the
+mega-widget.
+*** POTENTIAL INCOMPATIBILITY ***
+
+3/17/95 (feature change) Changed C interfaces throughout Tk to use ints
+instead of unsigneds:  the unsigneds turn out to cause subtle problems
+with arithmetic in some places, and using ints everywhere is just
+simpler.
+*** POTENTIAL INCOMPATIBILITY ***
+
+3/23/95 (bug fix) Selections longer than 4000 bytes were being
+truncated to 4000 bytes.
+
+-------------------- Release 4.0b3, 3/24/95 -------------------------
+
+3/25/95 (bug fix) Changed "install" to "./install" in Makefile so that
+"make install" will work even when "." isn't in the search path.
+
+3/25/95 (bug fix) Modified Tk's selection mechanism to prevent core
+dumps in other applications during retrievals of large selections
+(this is actually a bug in the other apps, but I've patched Tk to
+keep it from getting triggered).
+
+3/25/95 (bug fix) Fixed bug where X window for "." wasn't being
+deleted.
+
+3/27/95 (bug fix) Fixed many bugs associated with having more than
+one application in a single process.
+
+3/28/95 (bug fix) The "search" widget command for texts didn't
+return the correct index and count if there were embedded widgets
+on the same line as the returned range but before the end of
+the range.
+
+3/28/95 (bug fix) Changed pasting via button 2 in text and entries
+so that it inserts at the pointer location, not the location of
+the insertion cursor.
+
+3/28/95 (bug fix) Fixed several bugs related to <Destroy> bindings
+that delete ancestors in the window hierarchy.  Also eliminated
+extraneous calls to XDestroyWindow, which speeds up window deletion
+by about 3x.
+
+3/28/95 (bug fix) Several widgets (buttons, menubuttons, menus) didn't
+properly handle image deletions that occurred while the widget was
+being deleted (caused core dumps).
+
+3/29/95 (bug fix) When retrieving long selections from text widgets,
+parts of lines were getting duplicated in the selection information.
+
+4/1/95 (bug fix) Fixed bug that caused infinite loop in horizontal
+scales with 0 range.
+
+4/1/95 (bug fix) Fixed problem with -command option for scrollbars and
+-takefocus option that caused commands to be evaluated in the wrong
+context.
+
+4/1/95 (bug fix) Fixed problem with option database that caused it to
+sometimes use the wrong option (wasn't flushing the database properly
+after a change in a window's class).
+
+4/1/95 (bug fix) If a line in a text widget just barely fit in the window,
+Tk was allocating a second screen line just for the newline character.
+
+4/1/95 (new feature) When backspacing in an entry widget, when you reach
+the left edge of the widget, the insertion cursor gets recentered.
+
+4/1/95 (new features) Added "winfo pointerx" and "winfo pointery" commands
+to fetch the current pointer position.
+
+4/6/95 (bug fix) If the last line of a text widget was only partially
+visible, it was counted as visible for purposes of the scrollbar.  Now
+it is treated as if it were off-screen for scrolling purposes.
+
+4/6/95 (new feature) Modified "bell" command to reset screen saver as well.
+
+4/6/95 (feature change) Modified menu scanning (where menus pull down
+as you drag across their menubuttons) so it only works among menus
+in the same toplevel;  it used to work for any menubuttons in the
+application.
+
+4/6/95 (bug fix) Canvas text items weren't allowing real numbers in
+"@x,y" notation for specifying indices.
+
+4/7/95 (bug fix) Menus didn't display correctly when -activeborderwidth
+was large.
+
+4/7/95 (bug fix) Changed "clipboard append" command to support -- option
+and to always treat the last argument as data, even if it starts with
+"-".
+
+4/17/95 (new feature) Added -wrap option to text tags.
+
+4/18/95 (bug fix) Listboxes and texts weren't updating their grid information
+when -width or -height changed.
+
+4/18/95 (bug fix) "Down" didn't work right in text widgets if the last
+line was only partially visible in the window.
+
+4/19/95 (bug fix) Listboxes didn't handle partially visible last lines
+right:  couldn't scroll it into full visibility, for example.
+
+4/20/95 (bug fix) If a toplevel was positioned with a command like
+"wm geometry . -0-0", the window didn't reposition itself to maintain
+that geometry after a size change.
+
+4/21/95 (feature change) Changed order of binding tags so widget bindings
+fire before class bindings.  New order is: widget, class, toplevel, all.
+*** POTENTIAL INCOMPATIBILITY with Tk 4.0b3, but not with Tk 3.6 ***
+
+4/23/95 (new feature) Added "winfo colormapfull" command.
+
+4/23/95 (new feature) Buttons and radiobuttons and checkbuttons now
+treat Return the same as Space, unless tk_strictMotif is set.
+
+4/23/95 (bug fix) Modified menu tear-off procedure to duplicate the
+binding tags and bindings of the original in the copy.
+
+4/25/95 (bug fix and feature change) Modified mechanism for choosing
+"best" visual to fix a bug where depth wasn't really getting highest
+priority in all situations.
+
+4/28/95 (bug fix) Failed text searches starting at "end" could result
+in an infinite loop in Tk.
+
+4/30/95 (new feature) Added "wm resizable" command to enable and
+disable interactive resizing.
+
+4/30/95 (new feature) Added "window names" widget command to texts:
+returns a list of all embedded windows.
+
+5/2/95 (feature change) Changed text searches so that forward searches
+start at the given index, rather than the character just after the
+given index.
+*** POTENTIAL INCOMPATIBILITY with Tk 4.0b3, but not with Tk 3.6 ***
+
+5/4/95 (bug fix) Default bit gravity for windows was wrong (it was
+ForgetGravity) causing unnecessary flashing when windows were resized.
+
+5/4/95 (feature change) Modified Tk_DoOneEvent so that it doesn't
+sleep if there's nothing that will wake it up again (e.g. no file
+or timer handlers).  Returns 0 immediately.
+
+5/5/95 (configuration change) Changed to use BSDgettimeofday instead
+of gettimeofday on systems like IRIX where BSDgettimeofday is
+available.  This avoids compilation problems due to the different
+interface to gettimeofday provided by IRIX.
+
+5/5/95 (feature change) Changed binding mechanism so that all bindings
+are created immediately at initialization time, rather than waiting
+until the first FocusIn or Enter event for a class.
+
+5/6/95 (feature change) Changed default text for labels, buttons,
+checkbuttons, radiobuttons, menubuttons, and messages from " " to
+"".
+
+5/6/95 (bug fix) If the application was destroyed in the middle of
+an "update" command, Tk would dump core.
+
+5/6/95 (bug fix) Changed manual entries to use the standard .TH
+macro instead of a custom .HS macro;  the .HS macro confuses index
+generators like makewhatis.
+
+5/6/95 (bug fix) Change "wm iconwindow" command to disable button
+presses for the icon window.  This is needed so that the window
+manager can get those events (X only allows button presses to go
+to one client for a given window).
+
+5/9/95 (new feature) When specifying visuals, can now use "best"
+with a depth, e.g. "-visual {best 8}" to get the best 8-bit visual.
+
+5/18/95 (bug fix) Fixed bug with -spacing* options for text widget:
+screen distances weren't allowed, only integers.
+
+5/20/95 (bug fix) Eliminated memory leaks in tkTextDisp.c and elsewhere.
+
+5/22/95 (color change) Changed the Tk color palette to a gray scheme.
+Also added a library procedure tk_setPalette that makes it easy to
+change colors on the fly, and a procedure tk_bisque that restores the
+previous light brown scheme.
+
+5/28/95 (bug fix) Modified canvases so that the -width and -height
+options refer to the space inside the borders, not the total widget
+space.  Also changed "xview" and "yview" commands and scroll-increment
+rounding to use the pixel just inside the borders, rather than (0,0).
+
+5/28/95 (bug fix) Several widgets (e.g. entries, buttons, and menus)
+didn't properly handle unsets of variables they were tracing, if the
+variables were reference through upvars in procedures.
+
+6/4/95 (bug fix) The placer wasn't rounding window widths right when
+both -relx and -relwidth were specified (or -rely and -relheight) so
+that rounding errors accumulated.
+
+6/4/95 (feature improvement) Change parsing of text indices to handle
+weird mark and tag names better (e.g. any string ending with ".first"
+will now be parsed as a tag name, even if it contains embedded spaces,
+etc.).
+
+6/4/95 (feature change) If a font defines glyphs for control characters,
+they are now displayed, instead of translating the character to a
+backslash sequence (however, tabs and newlines are still treated
+specially;  glyphs are not displayed for these characters).
+
+6/4/95 (bug fix) Modify the implementation of "raise" and "lower" for
+toplevels so that it now works under olwm and olvwm.  It didn't use to
+work, and the problem is really in the window manager, but Tk now
+patches around it.  However, only "total" raises and lowers work:
+raising and lowering relative to a sibling still don't work under
+olvwm and olwm.
+
+6/4/95 (feature change) Modified tab code in texts so that a tab always
+occupies at least as much space as a space character.
+
+6/4/95 (bug fix) The "%t" substitution wasn't being made properly in
+Enter and Leave event bindings.
+
+6/7/95 (new feature) Added support for GIF images.  Unfortunately it's
+a bit fragile:  certain kinds of badly formed images can cause core
+dumps;  I don't know enough about the GIF reader (taken from giftoppm)
+to figure this out.
+
+6/7/95 (bug fix and feature change) Fixed PPM image reader to be more
+flexible about header formats, and added support for PGM images.
+
+6/7/95 (feature change) Added -outlinestipple option to canvas arc
+items, changed "-style arc" to use -outline as the color instead of
+-fill (the old approach was pretty quirky).
+*** POTENTIAL INCOMPATIBILITY ***
+
+6/8/95 (feature change) Modified interface to Tk_Main to pass in the
+address of the application-specific initialization procedure.
+Tcl_AppInit is no longer hardwired into Tk_Main.  This is needed
+in order to make Tcl a shared library.
+
+6/8/95 (feature change) Modified Makefile so that the installed versions
+of wish and libtk.a have version number in them (e.g. wish4.0 and
+libtk4.0.a) and the library directory name also has an embedded version
+number (e.g., /usr/local/lib/tk4.0).  This should make it easier for
+Tk 4.0 to coexist with earlier versions.
+
+6/9/95 (new feature) Added -outline and -width options to canvas polygon
+items.
+
+6/9/95 (feature changed) Renamed -decimate in photo widget to -subsample
+(decimate wasn't technically correct).
+*** POTENTIAL INCOMPATIBILITY with Tk 4.0b3, but not with Tk 3.6 ***
+
+-------------------- Release 4.0b4, 6/16/95 -------------------------
+
+6/19/95 (bug fix) Colors weren't being rounded correctly in canvas
+Postscript generation: caused "white" to appear slightly gray when
+the display of the canvas used only 8 bits per color.
+
+6/20/95 (bug fix) "bbox" widget command for texts didn't return
+proper width for tabs.
+
+6/20/95 (bug fix) Scrollbars didn't always work right for texts:
+couldn't scroll all the way to the bottom of the text in a single
+drag of the slider.
+
+6/20/95 (new feature) Added "delta" widget command for scrollbars
+(needed for above bug fix).
+
+6/23/95 (bug fix) Listboxes weren't properly redisplaying their
+borders when the were configured to a smaller size.
+
+6/23/95 (new feature) Added "winfo server" command.
+
+6/23/95 (bug fix) If a menu was posted, couldn't switch to another
+menu with an Alt- key.
+
+6/24/95 (new feature) Added "winfo pointerxy" command.
+
+6/25/95 (bug fix) Tk_ParseArgv referenced beyond the end of 0-length
+option names.
+
+6/25/95 (bug fix) Fixed problem in tkOption.c where "cachedWindow"
+could get garbage in it if the main window's class was changed by
+calling Tk_SetClass.
+
+6/25/95 (bug fix) Fixed two bugs in menus, one where errors in
+variable traces weren't propagated correctly and one where "invoke"
+was invoked at the wrong stack level, with the result that variable
+traces didn't have access to the right variables.
+
+6/27/95 (bug fix) tk3d.c wasn't using all the right information
+when deciding whether or not to stipple borders, so it stippled
+borders even on 16-bit true-color displays.
+
+6/28/95 (bug fix) Page up and down operations in texts could cause
+insertion cursor to drift to the right.  Changed tkTextScrollPages
+to use upper-left corner of current character, rather than center
+of character.
+
+6/28/95 (bug fix) Changed text widget so that you can't put the
+insertion cursor after the last newline in the text.
+
+6/28/95 (bug fix) Bitmap images didn't allow ~'s in file names.
+
+6/28/95 (bug fix) Fixed problem that could cause core dumps in the
+text widget when dealing with embedded windows (there were problems
+if the act of redisplaying caused the window layout to change, which
+can happen with embedded windows).
+
+6/28/95 (bug fix) Texts didn't handle indices with double negatives,
+such as ".t mark set insert {insert + -20 chars}".
+
+6/28/95 (bug fix) Fixed problem where focus didn't always revert to
+its prior window after a dialog box was dismissed.
+
+6/28/95 (bug fix) Fixed problem with "search" widget command returning
+incorrect length on some backwards regexp searches.
+
+6/28/95 (bug fix) Successive "wm iconbitmap . {}" commands could cause
+a core dump.
+
+6/29/95 (new feature) Added -elementborderwidth option for scrollbars
+so the -borderwidth can be set to 0 without flattening the arrows and
+slider.
+
+-------------------- Release 4.0, 7/1/95 -------------------------
+
+7/18/95 (bug fix) %t in event bindings didn't work properly for some
+events (e.g. PropertyNotify).
+
+7/18/95 (bug fix) Changed "exec wish" lines in demo scripts to
+"exec wish4.0" to avoid version conflicts.
+
+7/18/95 (bug fix) Fixed round-off errors in scrolling for texts,
+canvases, listboxes, and entries.  The error could cause the view
+to shift up in a command like "$w yview moveto [lindex [$w yview] 0]".
+
+7/19/95 (bug fix) Canvases weren't always redrawing borders correctly
+when they became unobscured.  There were also some problems with
+improper refresh after size changes.
+
+7/19/95 (bug fix) Fixed bug in text index processing that causes
+tests textIndex-11.1 and textIndex12.1 to fail on some platforms.
+
+7/19/95 (bug fix) Fixed bug where 2-second delays were ocurring during
+"raise" and "lower" commands for toplevel windows under some window
+managers (such as fvwm).
+
+7/20/95 (bug fix) Text searches were misbehaving when there were embedded
+windows on the starting line of the search.  The most common symptom is
+that Tk would fail to find a match at the starting position for the
+search.
+
+7/22/95 (bug fix) Fixed core dump that could occur in menus if a checkbutton
+entry's -variable option referred to an array (or couldn't be read
+by the menu C code for some other reason).
+
+7/22/95 (bug fix) Text widgets didn't update their scrollbars when
+changes were made to information that was off-screen.
+
+7/25/95 (bug fix) Fixed core-dump in tkListbox.c that used to happen
+in the command ".l bbox end" if the listbox was empty.
+
+7/25/95 (bug fix) Page-up and page-down bindings for listboxes didn't
+move active element to remain on the screen.
+
+7/25/95 (bug fix) Patched around H-P compiler problem that results in
+core-dumps in tkImgPhoto.c during image handling.
+
+7/25/95 (bug fix) Fixed bug in tkImgPhoto.c that caused core dumps
+(during Tk self-tests and other image uses) on AIX and other machines
+where "schar" in tkImgPhoto.c was being defined as "short" instead of
+"char".
+
+7/26/95 (bug fix) The PPM image reader couldn't handle maximum intensity
+values other than 255.
+
+7/26/95 (bug fix) Canvases didn't redraw their borders when the relief
+changed from raised to flat.
+
+7/27/95 (bug fix) Canvases didn't set the scrolling values correctly
+when no scroll region was specified.
+
+7/28/95 (bug fix) Modified menu and tk_dialog scripts to restore any
+old grab that might have been in effect before a menu or dialog was
+posted.
+
+----------------- Released patch 4.0p1, 7/29/95 ----------------------
+
+8/4/95 (bug fix) Calls to toupper and tolower weren't using the UCHAR
+macro, so they didn't always work in non-U.S. locales. (JO)
+
+8/14/95 (new feature) Added -tearoffcommand option for menus.
+
+8/16/95 (bug fix) Canvases didn't generate proper Enter and Leave
+events if the Leave handler for an item reconfigured the canvas in
+a way that made the old current item the new current item again. (JO)
+
+8/21/95 (bug fix/feature change) When -takefocus was a script, Tk
+was allowing window viewability to override it.  Changed so that
+viewability is now ignored when -takefocus is a script. (JO)
+
+8/21/95 (bug fixes) Fixed memory leaks in tkSend.c, tkSelect.c, and
+tkUnixWm.c (JO).
+
+8/21/95 (bug fix) Text widgets didn't handle commands like
+".t search -backwards foo end 1.0" properly:  never found foo. (JO)
+
+8/23/95 (new feature) Added Makefile and configure.in support for
+dynamic loading. (JO)
+
+8/25/95 (bug fix) The "frame" and "toplevel" commands couldn't safely
+be renamed, due to a kludgy way that they shared a single command
+procedure.  Split into separate procedures. (JO)
+
+8/25/95 (bug fix) Fixed bug in libary/menu.tcl that caused "grab
+window not visible" errors for popup menus (and perhaps elsewhere?). (JO)
+
+8/25/95 (bug fix / new feature) The "gray25" bitmap was really only
+12.5% on, not 25%.  Added new "gray12" bitmap that is the same as the
+old "gray25".  "Gray25" is still supported for compatibility, but its
+use is deprecated. (JO)
+
+8/25/95 (bug fix) Scrollbar bindings didn't properly handle case where
+B2 is clicked while B1 is already down. (JO)
+
+8/26/95 (bug fix) Menus were ignoring -activebackground if tk_strictMotif
+was set, but not -activeforeground.  Changed to ignore both. (JO)
+
+8/26/95 (bug fix) Scales and scrollbars didn't properly handle a
+-repeatdelay value of 0 (they shouldn't auto-repeat in this case). (JO)
+
+8/28/95 (bug fix) Tcl errors were occurring for tkPriv(oldGrab) when
+clicking on a disabled option menu. (JO)
+
+8/28/95 (bug fix) Changed event-handling code to use FD_SETSIZE instead
+of OPEN_MAX, since OPEN_MAX is incorrect on some systems (e.g., IRIX). (JO)
+
+8/28/95 (bug fix) Fixed bug in photo images that caused garbling of
+image data in the "put" and "copy" commands if the source data had
+only one scan line but had a width less than the width of the target
+image. (JO)
+
+8/29/95 (bug fix) Tk used to refuse to post menus if they had no
+entries.  This made it impossible for a menu to fill itself the first
+time it is posted.  Changed to allow menus with no entries to be
+posted. (JO)
+
+8/30/95 (bug fix) If there was extra space at the bottom of a menu,
+it wasn't being redisplayed properly.
+
+8/30/95 (new feature) Added -transient option to menus.
+
+8/30/95 (new features) Added proper button 2 support to both scrollbars
+and scales (it sets the slider position from the mouse position). (JO)
+
+8/30/95 (bug fix) Fixed potential core dump that could occur in
+photo images (ReadPPMFileHeader could overflow buffer under some bad
+inputs, such as certain GIF images). (JO)
+
+8/30/95 (bug fix) Errors of the form `syntax error in expression "!"'
+could occasionally happen in tkScaleDrag. (JO)
+
+8/31/95 (new feature) Changed man page installation (with "mkLinks"
+script) to create additional links for manual pages corresponding to
+each of the procedure and command names described in the pages. (JO)
+
+9/1/95 (new feature) Added "after info" command.  Also added checks
+so that one interpreter can't cancel another's "after" events. (JO)
+
+9/8/95 (bug fix) Fixed bug that could cause memory corruption and core
+dumps if a "fileevent" handler was deleted while the handler was
+active. (JO)
+
+9/11/95 Reorganized Tk sources for Windows and Mac ports.  All sources
+are now in subdirectories:  "generic" contains sources that work on all
+platforms, "windows", "mac", and "unix" directories contain platform-
+specific sources.  (SS)
+
+9/11/95 (new feature) Added new  "notifier" mechanism to allow multiple
+implementations of the mechanisms for finding out about events.  This
+change was necessary to support Mac and PC platforms, but it may also
+allow other goodies such as combining Xt and Tk widgets in a single
+application.  See the new manual entry Notifier.3 for details. (SS)
+
+9/11/95 (feature change) Changed interface to Tk_RestrictProc so that
+(a) it takes a clientData argument instead of display and arg, and
+(b) it returns a value that can ask for the event to be discarded as well
+as deferred or processed. (SS)
+*** POTENTIAL INCOMPATIBILITY ***
+
+9/11/95 (new feature) Added TK_WINDOW_EVENTS #define, which is equivalent
+to TK_X_EVENTS but is now preferred, since it applies to all platforms. (SS)
+
+9/11/95 (feature change) Can't export variables anymore because this doesn't
+work under Windows DLLs.  Eliminated tk_NumMainWindows variable and replaced
+with procedure Tk_GetNumMainWindows. (SS)
+*** POTENTIAL INCOMPATIBILITY ***
+
+9/11/95 (new feature) Added procedure Tk_PreserveColormap to increment
+the reference count on colormaps.  Used in photo widgets. (SS)
+
+----------------- Released patch 4.0p2, 9/15/95 ----------------------
+
+----------------- Released 4.1a1, 9/15/95 ----------------------
+
+9/22/95 (renamed files) Changed the names of the bitmap images in the
+$tk_library/demos/images directory to use the .bmap file extension.  (RJ)
+
+9/22/95 (bug fix) Fixed bug where text widgets could occasionally
+display the insertion cursor both at the end of one line and the
+beginning of the next. (JO)
+
+9/25/95 (bug fix) Fixed bug that could cause core dumps when an
+application uses multiple screens and a binding destroys the main
+window (bind code was using MainInfo structure after it had been
+freed). (JO)
+
+9/25/95 (bug fix) Text widgets sometimes scrolled backwards on
+occasion if you dragged down past the bottom of the scrollbar. (JO)
+
+9/25/95 (bug fix) Fixed bug in menus where a cascaded submenu posted
+from a torn-off menu could be left posted if mouse was pulled off the
+end of the cascade and released. (JO)
+
+9/25/95 (new feature) Added "--" switch to wish, so that you can
+pass arguments like -n through to a script without having wish
+interpret them. (JO)
+
+9/25/95 (bug fix) Fixed core dump that could occur for radiobuttons
+and selectbuttons if -selectcolor was an empty string. (JO)
+
+9/26/95 (bug fix) Entries didn't used to notice if a trace procedure
+on the -textvariable overrode a new value set by the entry.  This
+could cause the variable to get out of sync with the contents of the
+entry. (JO)
+
+9/26/95 (new feature) Added -sliderrelief option to scales, changed
+default bindings to change the slider's relief to sunken while it's
+being dragged with the mouse. (JO)
+
+9/26/95 (bug fix) TkColor.c wasn't computing colormap size correctly;
+could result in X Protocol error for QueryColors when colormaps run
+out of colors. (JO)
+
+9/26/95 (bug fix) Wish couldn't handle script files with spaces in
+their names. (JO)
+
+9/27/95 (cosmetic clean-up) Removed extraneous spaces to make error
+messages consistent: ":  should be" is now ": should be". (JO)
+
+9/27/95 (feature change)  Modified tk_dialog so that it uses the
+option database for the -wraplength option on the message.  This
+allows the option to be overridden by the caller. (JO)
+
+9/28/95 (bug fix) Wish incorrectly parsed the command line under
+Windows, causing backslashes to be substituted. (SS)
+
+9/28/95 (bug fix) Wish now sources wishrc.tcl instead of .wishrc. (SS)
+
+9/28/95 (bug fix) Tk_DoOneEvent returned 0 under some circumstances
+when it was possible to find more work to do.  For example, if a
+signal interrupted select(), but no event handlers were triggered, it
+would return 0 even though it could still detect events by reentering
+select().  (SS)
+
+9/29/95 (bug fix) "winfo interps" caused a crash under Windows. (SS)
+
+10/1/95 (feature change) Eliminated Tk_NotifyIdle interface in favor of
+Tk_IdlePending. (SS)
+
+10/1/95 (bug fix) Turned motion event collapsing into an idle handler
+so it will be easier to move the event loop into Tcl. (SS)
+
+10/1/95 (bug fix) Fixed several problems with negative coordinates
+in canvases.  One example:  dragging a canvas rectangle with a wide
+border and fractional coordinates could leave junk on the screen
+if the rectangle was in negative coordinate space. (JO)
+
+10/2/95 (bug fix) Tk was improperly handling Enter/Leave events
+during a button grab. (SS)
+
+10/2/95 (new feature) Added support for the Macintosh do script
+('dosc') event.  Available only on the Macintosh.  (RJ)
+
+10/4/95 (new feature) Added support for compiling with VC++.
+Resulting binaries work under Win32s through NT.
+
+----------------- Released 4.1a2, 10/6/95 ----------------------
+
+10/10/95 (new feature) Macintosh Tk now supports the complete set
+of X cursors that Unix Tk supports. (RJ)
+
+10/11/95 (bug fix) Tk now supports all of the X11 cursors under
+Windows.  (SS)
+
+10/11/95 (bug fix) The "wm resizable" command was missing from the
+Windows version of Tk. (SS)
+
+10/12/95 (bug fix) Macintosh Tk had problems with clipping toplevel
+windows that children of any frame other than another toplevel. (RJ)
+
+10/13/95 (bug fix) Eliminated dependency on MKS toolkit for generating
+the tk.def file from Borland object files. (SS)
+
+10/16/95 (bug fix) Fixed clipping and update problems relating to
+the raising and lowering of overlapping windows on Mac. (RJ)
+
+10/30/95 (bug fix) When focus-follows-mode (invoked via tk_focusFollowsMouse),
+was focussing on windows even in situations where keyboard traversal would
+skip the window.  Changed to use the tkFocusOK procedure so that the
+criteria for focussing are the same in both modes. (JO)
+
+11/2/95 (bug fix) Changed listbox bindings to ignore double-clicks.
+This avoids errors that used to occur if a user defined a binding
+for double-click that deleted the listbox. (JO)
+
+11/3/95 (feature change) Moved most of the Tk event loop to Tcl.  Many
+Tk_ names have become Tcl names now:
+
+TK_READABLE =>		TCL_READABLE
+TK_WRITABLE =>		TCL_WRITABLE
+TK_EXCEPTION =>		TCL_EXCEPTION
+TK_DONT_WAIT =>		TCL_DONT_WAIT
+TK_WINDOW_EVENTS =>	TCL_WINDOW_EVENTS
+TK_FILE_EVENTS =>	TCL_FILE_EVENTS
+TK_TIMER_EVENTS =>	TCL_TIMER_EVENTS
+TK_IDLE_EVENTS =>	TCL_IDLE_EVENTS
+TK_ALL_EVENTS =>	TCL_ALL_EVENTS
+Tk_IdleProc =>		Tcl_IdleProc
+Tk_FileProc =>		Tcl_FileProc
+Tk_TimerProc =>		Tcl_TimerProc
+Tk_TimerToken =>	Tcl_TimerToken
+Tk_BackgroundError =>	Tcl_BackgroundError
+Tk_CancelIdleCall =>	Tcl_CancelIdleCall
+Tk_CreateFileHandler =>	Tcl_CreateFileHandler
+Tk_CreateTimerHandler =>Tcl_CreateTimerHandler
+Tk_DeleteFileHandler =>	Tcl_DeleteFileHandler
+Tk_DeleteTimerHandler =>Tk_DeleteTimerHandler
+Tk_DoOneEvent =>	Tcl_DoOneEvent
+Tk_DoWhenIdle =>	Tcl_DoWhenIdle
+Tk_Sleep =>		Tcl_Sleep
+tkerror =>		bgerror
+
+Other than the name changes, the functions are the same.  In addition,
+there are #defines in tk.h so that the old Tk names will still work.
+tkerror and bgerror are specially hacked as synonyms, so it should be
+safe to use either one.  You should switch to the new Tcl names ASAP,
+though, since the old Tk names will eventually be desupported. (JO)
+
+11/7/95 (features removed) As part of moving the event loop to Tcl,
+the following procedures were deleted:
+    - Tk_EventInit (the presence of the event loop in Tcl should
+      make this unneccessary).
+    - Tk_CreatFileHandler2 (you can get the same effect by using event
+      sources in Tcl, but you have to modify your code to use the new
+      Tcl APIs).
+    - All of the stuff in the manual entries Notifer.3 and QueueEvent.3;
+      this has changed because the notifier got reworked when it was
+      moved to Tcl.
+*** POTENTIAL INCOMPATIBILITY ***
+
+11/7/95 (feature change)  Changed to use exit handler to cleanup windows
+in Tk, so Tk no longer needs to have a private copy of the "exit" command.
+(JO)
+
+11/7/95 (bug fix) If wish was invoked with a command-line geometry and
+a script file (e.g. "wish foo.tcl -geometry 30x20"), and if one of
+the windows created by the script used the -setgrid option, then the
+width and height from the command line were lost. (JO)
+
+11/8/95 (bug fix) The "see" command didn't work quite right for texts:
+if the window was small and you try to "see" a line just offscreen,
+Tk centered the line (actually, mis-centered it) when it should have
+aligned it at the top or bottom. (JO)
+
+11/9/95 (bug fix) The "send" command crashed if you tried to send to
+a different display with "-displayof". (JO)
+
+11/9/95 (bug fix) The Symbol font didn't print right in Postscript
+output, because of changes made to re-encode fonts to get proper
+ISO Latin1 behavior.  Changed the code not to re-encode the Symbol
+font. (JO)
+
+11/13/95 (bug fix) Fixed Makefile.in and configure.in for UNIX so that
+configure can be run from a clean directory separate from the Tcl source
+tree, and compilations can be performed there. (JO)
+
+11/17/95 (bug fix) If a window was gridded, Tk still computed the
+default maximum dimensions in pixel units, which resulted in windows
+that could grow much larger than the screen. (JO)
+
+11/17/95 (bug fix) If a menus entries were all disabled, posting
+the menu and typing Up or Down caused an infinite loop, locking
+up the screen (JO).
+
+11/19/95 (bug fix) The focus wasn't being restored properly after a
+menu selection in a cascaded menu. (JO)
+
+11/19/95 (bug fix) Menubutton's didn't stipple display their images
+differently when disabled.  Change to have the same behavior as buttons:
+the image is stippled over in the background color when the menubutton
+is disabled. (JO)
+
+11/21/95 (bug fix) Changes in display attributes such as font could
+cause core dumps in the text widget under some circumstances involving
+line wrapping. (JO)
+
+11/22/95 (bug fix/new feature)  Changed both the placer and the packer
+to ensure that slaves are unmapped whenever the master is unmapped.
+This saves time that slaves might otherwise spend trying to redisplay
+themselves when they're unmapped. (JO)
+
+11/22/95 (bug fix) Space and return keys didn't work for menus if
+they were posted via Alt-x keystrokes. (JO)
+
+11/24/95 (bug fix) tk_dialog procedure had binding for <Return> that
+always activated default binding, even if input focus was in some
+other binding.  Removed this feature, since existing focus support
+will already "do the right thing".  (JO)
+
+11/24/95 (bug fix) Both canvases and texts could dump core if a binding
+(such as ButtonRelease on an internal item) deleted the widget. (JO)
+
+11/24/95 (feature change) Replaced "configInfo" file with tkConfig.sh,
+which is more complete and uses slightly different names.  Also
+arranged for tkConfig.sh to be installed in the platform-specific
+library directory. (JO)
+
+11/24/95 (bug fix) It was possible for a slave to be placed or packed
+-in itself, with unpleasant consequences.  It is now an error for the
+slave to be its own master for geometry management. (JO)
+
+11/25/95 (bug fix) The -command option of scales was sometimes being
+invoked spuriously (e.g. when the mouse moved in the scale without a
+button down).  This was because the scale wasn't rounding properly
+when setting the scale value from its associated variable. (JO)
+
+----------------- Released patch 4.0p3, 11/28/95 ----------------------
+
+12/18/95 (feature change) Moved Tk_Preserve, Tk_Release, and
+Tk_EventuallyFree to Tcl, renamed to Tcl_Preserve etc.  Added #defines
+to tk.h so that the old names still work.  (JO)
+
+12/23/95 (bug fix) If a single process had > 1 Tk application, Tk
+didn't guarantee that the application names were unique, which could
+cause all sorts of confusion with "send".  (JO)
+
+12/23/95 (feature change) Eliminated Tk_CreateMainWindow and moved
+all of its functionality to Tk_Init.  All that you need to do now
+to get Tk in an application is to call Tk_Init.  Improved Tk_Init
+so that -colormap and -visual command-line arguments are now passed
+through to TkCreateFrame.  Tk_Main is much simpler now, since a lot
+of its functionality has moved to Tk_Init. (JO)
+*** POTENTIAL INCOMPATIBILITY ***
+
+12/23/95 (new feature) Added support for Tcl_StaticPackage so
+that Tk can now be loaded into slave interpreters with the "load"
+command to create new applications. (JO)
+
+12/23/95 (new features) Added support for -colormap and -visual command-
+line options for wish. (JO)
+
+1/4/95 (bug fix) Fixed keyboard code to properly handle alt-key
+sequences for international keyboards and menu-accelerators. (SS)
+
+1/5/96 (bug fix) Scrollbar code sometimes generated errors on accesses
+to tkPriv(relief) during control-clicks. (JO)
+
+1/9/96 (new feature) added the "grid" command to provide a table based
+geometry manager. (SU)
+
+1/12/96 (performance optimization) Changed the way tag information is kept
+in the text's Btree so the cost of adding and removing tag ranges is no longer
+proportional to the number of unique tags in the text.  In the old system
+the cost of adding N unique tags was O(N-squared).  The new implementation is
+optimized for tags that only cover a small amount of text, measuring from
+their earliest tag range to the end of their last range.  In the best case the
+cost of adding a tag range is unrelated to the number of unique tags, so the
+cost of adding N tags is only O(N).  In the worst case, where all tags
+cover all the text, the cost is still O(N-squared) to add N such tags.
+Deleting tags still has an O(N) cost (so deleting N tags is O(N-squared),
+but it is now a factor of 2 faster than the old system. (BW)
+
+1/12/96 (new feature) added the text "dump" operation that returns information
+about all elements in a text widget: text, tags, marks, and windows. (BW)
+
+1/12/96 (new feature) added the text "mark next" and "mark previous" operations
+to search forward and backwards for the next (previous) mark in the text. (BW)
+
+1/12/96 (new feature) added the text "tag prevrange" operation to search
+backwards for the current or previous range of a tag. (BW)
+
+1/16/96 (new feature) Added support for relative widget placement on
+the "grid" command. (SU)
+
+1/17/96 (new feature) Modified the Makefile/configure setup to support
+compiling Tk as a shared library.  Use the --enable-shared option to
+the "configure" script. (JO)
+
+----------------- Released 4.1b1, 1/26/96 -----------------------
+
+2/2/96 (bug fix) Frames were getting a default size of 200x200, whereas
+there should be no default. (JO)
+
+2/2/96 (bug fix) Argc wasn't getting reset properly after Tk removed
+the arguments it understood from those on the command line. (JO)
+
+2/6/96 (bug fix) Fixed off by one error in argument parsing code under
+Windows. (SS)
+
+2/6/96 (bug fix) "wm transient" now works under Windows.  The resulting
+toplevel is created with a modal dialog box frame and will not appear
+in the taskbar under Windows '95. (SS)
+
+2/9/96 (bug fix) Changed Makefile.in to use -L and -l for Tcl and Tk
+libraries so that shared libraries are more likely to be found correctly
+on more platforms. (JO)
+
+2/14/96 (feature change) Eliminated tk_CanvasTagsOption variable because
+it can't be exported safely across DLL boundaries.  Instead, exported
+Tk_CanvasTagsParseProc and Tk_CanvasTagsPrintProc procedures for
+use by canvas type managers in creating their own custom options. (JO)
+*** POTENTIAL INCOMPATIBILITY ***
+
+2/14/96 (bug fix) "winfo pointerxy" when applied to a non-toplevel window
+crashed wish.  (SS)
+
+2/14/96 (bug fix) "tkwait visibility" would hang under Windows. (SS)
+
+2/14/96 (bug fix) Cursors were not being updated until an enter event.
+In cases where the cursor left the toplevel and reentered before Tk
+noticed, the cursor would get "stuck" until the next enter event.
+Similarly, if the cursor attribute of a window was updated while the
+mouse was in the window, the cursor would not change until the next
+time the mouse entered the window. (SS)
+
+2/15/96 (bug fix) If a top-level was resizable in one direction
+(e.g. "wm resizable . 0 1"), once the user resized it any changes
+in the internally requested size (by the widgets) were ignored,
+even for the non-resizable dimension.  Fixed to handle the two
+dimensions totally independently, so the widget's requests are
+honored as long as that dimension hasn't been set by the user. (JO)
+
+2/17/96 (bug fix) If a text widget had very long lines (e.g. more than
+32K pixels), integer overflow could occur, resulting in parts of the
+line not being visible. (JO)
+
+2/20/96 (feature change) Changed the -minsize option of grid to take
+screen units instead of pixels. (SU)
+
+2/20/96 (bug fix) grid row and column weights are compared against
+MINWEIGHT (0.001) instead of 0.0 to guard against divide by zero errors
+during weight normalization. (SU)
+
+2/20/96 (bug fix) Menu commands were not being invoked sometimes.
+There was a race condition that caused events to be processed while a
+menu was being unposted. (SS)
+
+----------------- Released 4.1b2, 2/23/96 -----------------------
+
+2/23/96 (bug fix) Alt-keys invoked in torn-off and popped up menus
+caused menus to be posted in the parent toplevel. (JO)
+
+2/23/96 (bug fix) Canvases weren't always updating their scrollbars
+when they should. (JO)
+
+2/23/96 (bug fix) Fixed core dump that could occur if a WM_DELETE_PROTOCOL
+handler generated an error. (JO)
+
+2/24/96 (bug fix) Removed dependencies on Makefile in the UNIX Makefile:
+this caused problems on some platforms (like Linux?). (JO)
+
+2/24/96 (feature change) Changed text and entry widgets so that they
+set the insertion cursor before inserting during a button-2 click.
+Also made optional bindings check for tk_strictMotif at the time of
+the event, rather than at the time the bindings are created. (JO)
+
+2/24/96 (bug fix) Tk tended to crash with an X error when unsetting
+an icon window (e.g. "wm iconwindow . {}"). (JO)
+
+2/25/96 (bug fix) Wasn't removing windows from the WM_COLORMAP_WINDOWS
+property when they were deleted.  (JO)
+
+3/1/96 (new feature) Added new "bbox" widget command for entries.
+Also modified mouse bindings for entries and texts so that the
+mouse position rounds to the nearest inter-character gap, rather
+than the left edge of the character under the mouse.  This provides
+more natural selection behavior. (JO)
+
+3/1/96 (bug fix) Fixed core dump that could occur in image code if an
+image was deleted while in use in a widet, then re-used in another
+widget while "deleted". (JO)
+
+3/1/96 (bug fix) Calling wish with a single argument caused a crash
+under Windows due to an off-by-one error in the argument parsing code. (SS)
+
+3/1/96 (bug fix) Palette management was broken and resulted in
+incorrect palette realization and refresh behavior.  Also, images were
+being drawn incorrectly if they were attached to widgets that had a
+private colormap. (SS)
+
+3/2/96 (bug fix) It was possible to press the mouse button over an
+option menu, drag to a pulldown menu, and have the pulldown menu
+popup in place of the option menu.  Fixed this so that option menus
+are isolated from each other and from pulldowns. (JO)
+
+3/2/96 (bug fix) Fixed yet another bug that caused long delays when
+raising toplevel windows. (JO)
+
+3/2/96 (bug fix) Fixed bug in canvases where zero-sized rectangles
+and ovals didn't always redisplay right (could leave trailing
+garbage on screen when moved). (JO)
+
+3/2/96 (bug fix) Entry widgets reset their insertion cursor, selection,
+and view whenever the text variable changed, plus whenever a "configure"
+widget command was invoked and there was a text variable for the
+widget.  Fixed to preserve this information as much as possible. (JO)
+
+3/5/96 (new feature) Added version suffix to shared library names so that
+Tk will compile under NetBSD and FreeBSD (I hope).  (JO)
+
+3/6/96 (bug fix) Changed the way certain configure & motion events are
+reported.  This fixes several bugs in menus & "winfo rootx". (RJ)
+
+3/7/96 (bug fix) Fixed tag remove bug that showed up when draging out a
+selection.  If you had dragged left, then tried to drag back right, the
+left edge of the selection wasn't being updated because the tag remove
+wasn't doing anything. (BW)
+
+3/7/96 (bug fix) Fixed the boundary conditions of tag prevrange.  The second
+index argument wasn't effecting in stopping the search if it fell within
+a range.  The second index has to come at or before the start of a range
+for the range to be found by tag prevrange. (BW)
+
+3/7/96 (bug fix) "puts" to stdout or stderr when running from a script
+caused wish41.exe to exit silently.  Now the output is silently
+discarded without generating an error.  (SS)
+
+3/7/96 (bug fix) Fixed bug where wish was treating empty lines in the input
+as end of input, if the input came from stdin. This would cause it to
+complain about missing closing braces etc. (JL)
+
+----------------- Released 4.1b3, 3/8/96 -----------------------
+
+3/9/96 (bug fix) Fixed bug in text.tcl that could cause errors in text
+widgets of the form 'can't use non-numeric string as operand of "-"'. (JO)
+
+3/12/96 (feature improvement) Modified startup script to look in several
+different places for the Tcl library directory.  This should allow tk
+to find the libraries under all but the weirdest conditions, even without
+the TK_LIBRARY environment variable being set. (JO)
+
+3/14/96 (bug fix) "wish bogus_file_name" didn't print an error message. (JO)
+
+3/14/96 (bug fix) Button-2 wasn't claiming the focus during paste
+operations. (JO)
+
+3/14/96 (bug fix) "tkwait visibility" use to hang forever if its window
+was deleted.  Now it detects this condition and returns an error. (JO)
+
+3/16/96 (bug fix) Changed configuration stuff to get dynamic loading and
+shared libraries working under AIX. (JO)
+
+3/16/96 (bug fix) Fixed core dumps that could occur when a slave interpreter
+was deleted in the middle of executin bindings. (JO)
+
+3/18/96 (new feature) Added support for Activate/Deactivate events.
+Currently, these new X events will generated only on the Macintosh. (RJ/CS)
+
+3/21/96 (bug fix) The "tag prevrange" command would fail to return the current
+range if it began at 1.0 and the starting point of the search was within
+the range. (BW)
+
+3/21/96 (configuration improvement) Changed configure script so it
+doesn't use version numbers (as in -ltk4.1 and libtk4.1.so) under
+SunOS 4.1, where they don't work anyway.  (JO)
+
+3/22/96 (bug fix) Made Tk more robust against interpreter deletion. Now it
+should be safe to delete an interpreter with a Tk application inside it,
+without first deleting the Tk application. (JL)
+
+3/26/96 (bug fix) Tk now returns results from a "send" to an interpreter
+in which the Tk application is destroyed, if the interpreter continues
+computing after the Tk application is destroyed. Previously any results
+computed after '.' was destroyed in the target interpreter were discarded
+by the "send". (JL)
+
+3/26/96 (new feature) Tk now provides a static Tktest package which is
+present only in test versions of Tk; this allows the testing commands to
+be loaded into new interpreters besides the main one. (JL)
+
+3/28/96 (bug fix) Changed the tk_dialog procedure *not* to make the
+dialog a transient for its parent.  The old behavior meant that the
+dialog did not get posted if the parent was iconified. (JO)
+
+4/5/96 (bug fix) Tk would occasionally crash when destroying toplevels
+under Windows. (SS)
+
+4/5/96 (bug fix) Fonts were not being properly deallocated, causing
+GDI resources to be consumed and never released under Windows. (SS)
+
+4/11/96 (bug fix) Toplevel windows with no specified geometry were
+always appearing in the upper left corner of the screen under
+Windows. (SS)
+
+4/11/96 (bug fix) "wm minsize" did not properly report the minimum
+size imposed by the Windows window manager. (SS)
+
+4/13/96 (bug fix) Text widgets could dump core in some cases where
+text was inserted on the top visible line. (JO)
+
+4/16/96 (bug fix) Changed menu code to ignore errors that occur when
+restoring a grab:  the old grab window might not be visible anymore. (JO)
+
+----------------- Released 4.1, 4/21/96 -----------------------
+
+5/1/96 (bug fix) "option readfile" did not handle files with CRLF
+line termination. (SS)
+
+5/1/96 (bug fix) Changed to install tkConfig.sh under "make install-binaries",
+not "make install-libraries". (JO)
+
+5/7/96 (bug fix) Moved initScript in tkUnixInit.c to writable memory to
+avoid potential core dumps. (JO)
+
+5/7/96 (bug fix) Changed tk_dialog back so that the dialog box is a
+transient window again.  This is needed to make sure that the dialog
+box doesn't get obscured.  Also changed it to return -1 if the dialog
+window is deleted before the user presses a button. (JO)
+
+5/16/96 (bug fix) Fixed bug that caused core-dumps if a text widget
+with -setgrid 1 was deleted by removing its command. (JO)
+
+5/16/96 (bug fix) Fixed bug that caused Tk initialization to use improperly
+initialized variables left over from previous invocation of Tk_Init on
+another interpreter. (JL)
+
+5/16/96 (new feature) Implemented application embedding on Windows
+platforms (only Tk inside another application, not the other way yet). (JL)
+
+5/16/96 (new feature) Added C API Tk_SafeInit that adds Tk to a safe
+interpreter. (JL)
+
+5/16/96 (bug fix) Fixed bug that caused Tk initialization to use improperly
+initialized variables left over from previous invocation of Tk_Init on
+another interpreter. (JL)
+
+5/16/96 (new feature) Implemented application embedding on Windows
+platforms (only Tk inside another application, not the other way yet). (JL)
+
+5/16/96 (new feature) Added C API Tk_SafeInit that adds Tk to a safe
+interpreter. (JL)
+
+5/22/96 (bug fix) Listboxes weren't properly ignoring double clicks on
+button 1. (JO)
+
+6/12/96 (bug fix) Focus was automatically placed on new toplevels.
+This caused the titlebar to flash during menubar traversal. (SS)
+
+6/12/96 (bug fix) Iconification of a window with a specified geometry
+by using the minimize button would leave the window in an inconsistent
+state.  When the window was deiconified using "wm deiconify", the
+window would continue to display as an icon with the deiconified
+geometry. (SS)
+
+6/12/96 (bug fix) Fixed a resource leak where the text widget was not
+freeing all of the TkRegions it created.  This fix affects all
+platforms, but is particularly important for Win32s. (SS)
+
+6/21/96 (configuration change) Added --enable-gcc switch to configure
+script to make Tk just like Tcl.  Now Tk will not use gcc unless you
+request it explicitly. (JO)
+
+7/18/96 (bug fix) Changed "configure" script to add an extra -R switch
+(or whatever is appropriate to the platform) if the X library is in a
+nonstandard place.  This guarantees that the shared library can be
+found at runtime without having to set the LD_LIBRARY_PATH variable. (JO)
+
+7/19/96 (bug fix) Fixed bug in tkImgGIF.c that cause core dumps if a
+GIF file contained multiple images. (JO)
+
+7/20/96 (bug fix) Deadlock could occur if a recursive series of send
+operations involved multiple displays. (JO)
+
+7/23/96 (bug fix) Fixed a resource leak where deallocated XIDs were
+taking up memory on Windows and Macintosh platforms. (SS)
+
+7/30/96 (bug fix) A core dump could occur if a <Destroy> handler for
+a window tried to create a child in the half-dead window.  Fixed by
+making the window's name disappear from the name table once it starts
+to be deleted. (JO)
+
+----------------- Released patch 4.1p1, 8/2/96 -----------------------
+
+4/30/96 (new feature) Added support for named virtual events. New "event"
+command to define/destroy named virtual events and to programmatically
+send both real and virtual events to Tk. (CS)
+
+8/6/96 (bug fix) Entry widgets were invoking scrollbar update functions
+too often. (JO)
+
+8/9/96 (bug fix) 7/30 change above for <Destroy> handlers broke many
+things by making window available during Destroy handler.  Reworked
+fix for core dump to simply disallow creating children of half-dead
+parents. (JO)
+
+8/12/96 (bug fix) Fixed bug where using the Copy menu item on the
+Macintosh would append a NULL character at the end of the text. (RJ)
+
+8/15/96 (bug fix) Fixed Mac code so garbage wouldn't be printed in
+text and entry widgets when function & other non-printing keys were
+pressed. (RJ)
+
+8/15/96 (configuration improvement) Changed the file patchlevel.h
+to be tkPatch.h.  This avoids conflict with the Tcl file and is now
+in 8.3 format on the Windows platform. (RJ)
+
+8/19/96 (bug fix) Fixed a bug under Windows where the initial window
+position for a toplevel window was reported as +0+0, regardless of the
+actual position. (SS)
+
+8/21/96 (bug fix) If the last character on a line in a text widget was
+a space character that didn't completely fit, the text widget would
+sometimes add an extra wrap line. (JO)
+
+8/22/96 (feature change) Complete rewrite of the grid geometry manager.
+There is a new layout algorithm that produces better (but different)
+layouts in many common cases. (SU)
+
+8/22/96 (new feature) There are two new options for the grid geometry
+manager, "grid update" which forces an immediate layout calculation,
+and a "-pad" option to rowconfigure and columnconfigure that allows for
+extra space around widgets. (SU)
+
+8/22/96 (feature change) The order in which the grid geometry manager
+reports slaves is now last-managed first. (SU)
+
+8/22/96 (feature change) The column and row weights in the grid
+geometry manager are kept internally as integers, instead of floating
+point values.  Floating point values are still accepted on the command line,
+but are truncated to integers. (SU)
+
+8/22/96 (new feature) There are four new commands for opening common
+dialog boxes: tk_chooseColor, tk_getOpenFile, tk_getSaveFile and
+tk_messageBox. Native dialog boxes are used wherever available. (IL)
+
+8/22/96 (new demos) Added "fsbox", "msgbox" and "clrpick" demos. (IL)
+
+8/23/96 (feature change) Invoking the edit menu on the Macintosh now
+generates the following virtual events <<Cut>>, <<Copy>>, <<Paste>>,
+and <<Clear>> instead of faking key events. (RJ)
+*** POTENTIAL INCOMPATIBILITY ***
+
+8/25/96 (bug fix)  Fixed a bug that would cause "grid x" to dump core. (SU)
+
+8/26/96 (new feature) Added the "unsupported1" command to the
+Macintosh version of Tk.  This command will allow you to set the style
+of a new toplevel Window (much like overrideredirect).  You can use
+this to get access to all of the Native Mac window styles.  This is to
+hold you over until we get a more general solution added to the
+toplevel command. (RJ)
+
+8/26/96 (new feature) Added support to handle the zoom box on a
+Macintosh window.  (Currently, you can only get a Tk window with a
+zoom box by using the "unsupported1" command. (RJ)
+
+8/27/96 (documentation change) Removed old change bars (for changes in
+Tk 4.1 and earlier releases) from manual entries. (JO)
+
+----------------- Released 4.2b1, 8/30/96 -----------------------
+
+9/5/96 (bug fixes) Fixed several bugs in file dialogs: individual files
+could be listed twice, if a long list of files were shown, and the view
+scrolled to the right, and then a different file file was shown, the
+scrollregion on the canvas wasn't being reset, so the file dialog was
+broken from then on, added an update idletasks so that the watch
+cursor was shown when the dialog was thinking. For the motif file 
+dialog, fixed the weights for resizing.  On the clrpicker, fixed the
+finalColor variable which caused problems when the OK button was
+"clicked" before the dialog was mapped (in the test suite). Added Ioi's
+last changes from before he left. For message boxes, if a single button
+message box is shown (currently only 'ok'), it is set to be the default
+even if not specified. (KC)
+
+9/5/96 (bug fix) Fixed bug on Macintosh where menus would appear in a
+seemingly random location.  (RJ)
+
+9/5/96 (bug fix) Text widgets had rounding problems with the "yview"
+command that caused them sometimes to round to the line before the
+correct one. (JO)
+
+9/5/96 (bug fix) Changed grab code to retry grabs after errors where
+another application already has the grab.  This is needed to get
+around race conditions with some window managers and will hopefully
+solve the grab errors that people see occasionally. (JO)
+
+9/6/96 (bug fix) Fixed x-y coordinate confusion problem with scaling
+of window items in canvases. (JO)
+
+9/11/96 (bug fix) The open and save file dialogs would change the
+current working directory under Windows. (SS)
+
+9/12/96 (bug fix) The Tk event system was delivering events to dead
+windows, if the event handler got reentered during a Destroy event
+handler.  This could cause core dumps and other problems. (JO)
+
+9/20/96 (bug fix) In XFillRectangles under Windows, a brush was not
+being deallocated. (SS)
+
+9/20/96 (bug fix) The Mac window manager used to generate a mouseUp
+event for a top level that was recently raised to the front/active
+window which often caused a tk(priv) error.  The up event is no
+longer generated with solves several problems. (RJ)
+
+9/25/96 (bug fix) The font code under Windows was leaking memory
+whenever a new font was referenced using the three part font names. (SS)
+
+9/26/96 (bug fix) The tests for the common dialogs still used the 'testevent'
+function.  I updated these calls in clrpick.test, msgbox.test, filebox.test
+to use the new event gereating mechanism.
+
+9/18/96 (bug fix) Long-standing bug in bind where <Button-1><Button-1> was
+reported as <Double-Button-1>, but <Double-Key-a> was reported as "aa". (CS)
+
+9/27/96 (bug fix) Bindings didn't work on 64-bit machines due to changes 
+made for virtual events. (CS)
+
+9/30/96 (feature change) Binding for new virtual events included both 
+lower and upper-case, e.g., <<Copy>> was defined as <Control-c> and 
+<Control-C>.  Previously, widgets were directly bound to only lower-case
+bindings.  The upper-case binding caused incompatibility with some existing 
+Tcl programs, so the upper case bindings for <<Cut>>, <<Copy>>, and <<Paste>>
+were removed. (CS)
+
+9/30/96 (bug fix) The postscript code in the canvas widget now uses
+channels to get and write .ps files which fixed a bug on the Mac where
+an output file would have mixed EOL characters.  In addition, I added
+the ability for the prolog to come from the Tk shared library on the
+Mac which makes it possible to have a standalone application. (RJ)
+
+10/1/96 (feature change)  "grid forget" was renamed "grid remove".  A new
+command "grid forget" was added whose semantics are the same as "pack forget"
+(SAU)
+*** POTENTIAL INCOMPATIBILITY ***
+
+10/1/96 (feature change)  grid no longer accepts floating point values for
+row or column weights, integers must be used.  (SAU)
+*** POTENTIAL INCOMPATIBILITY ***
+
+10/1/96 (feature change)  "grid {column,row}configure <master> <index>"
+returns a list of option value pairs for all of the row or column
+constraints. It used to return an error. (SAU)
+
+10/1/96 (bug fix)  "The way grid handles '^' short-cuts was re-written
+to eliminate core dumps. (SAU)
+
+10/3/96 (feature change) A virtual event binding associated with a 
+given physical event is now considered less specific than a binding for
+that same physical event, all other things being equal. (CS).
+
+10/3/96 (bug fix) Under Windows text placed on the clipboard did not
+undergo CRLF translation when delivered to other applications. (SS)
+
+10/3/96 (bug fix) Copying an image onto itself with a zoom factor that
+caused the image to grow was accessing freed memory. (SS)
+
+10/3/96 (bug fix) Under Windows, the image blank subcommand did not
+work. (SS)
+
+10/10/96 (bug fix) Under Windows & Macintosh, XSetFont and XChangeGC
+were not implemented, and XSetLineAttributes did not correctly update
+the GC. (SS)
+
+10/10/96 (bug fix) Under Windows, 8-bit non-palette displays were not
+handled properly. (SS)
+
+10/10/96 (bug fix) Under Windows, images of depth other than 8 or 24
+bits were not being rendered properly. (SS)
+
+10/10/96 (bug fix) Under Windows, bitmap subimages were not correctly
+displayed. (SS)
+
+10/14/96 (bug fix) Under Window, wm resizable would constrain both
+programatic resizes as well as user resizes. (SS)
+
+----------------- Released 4.2, 10/16/96 -----------------------
+
+10/17/96 (bug fix) XCopyPlane was broken under Windows and would cause
+a crash when used with a clipping bitmap. (SS)
+
+10/21/96 (bug fix) Added missing resources needed by tk_getOpenDialog
+on the Macintosh to the shared library for Tk. (RJ)
+
+10/22/96 (bug fix) Invoking a menu with an Alt key sequence caused an
+error due to a misplaced common in library/menu.tcl. (JO)
+
+10/23/96 (bug fix) Errors in files sourced by the Macintosh
+"Source..." menu are now correctly reported via the background
+error mechanism. (RJ)
+
+10/23/96 (bug fix) Fixed a bug in the Mac subwindow implementation
+that caused refreshes to not occur for canvases with embedded 
+windows. (RJ)
+
+10/24/96 (bug fix) Provided workaround for Apple bug that doesn't
+handle zooming correctly for floating windows. (RJ)
+
+10/24/96 (bug fix) Macintosh tearoff menus are now correctly 
+displayed as Mac floating windows. (RJ)
+
+11/1/96 (bug fix) Restored manual page for procedures like
+Tk_CreateWindowFromPath and Tk_DestroyWindow; was accidentally deleted
+when Tk_CreateMainWindow procedure was decommissioned. (JO)
+
+11/19/96 (bug fix) Fixed bugs in postscript code that would cause the
+prefix to not be included and the output file to have the wrong
+permissions. (RJ)
+
+12/2/96 (bug fix) Fixed problem with canvas lines where it didn't
+compute bounding boxes correctly for zero-width lines: this could
+potentially leave garbage on the screen when items were deleted or
+moved. (JO)
+
+12/5/96 (bug fix) Fixed the Macintosh implementation of pointer x/y
+which was returning garbage. (RJ)
+
+12/6/96 (bug fix) Fixed grid bug where the positioning of slaves was
+incorrect for non-zero values of ipadx and ipady (SU)
+
+12/6/96 (bug fix) Fixed grid bug where slaves got "lost" when an
+already managed slave is re-managed in a different master. (SAU)
+
+----------------- Released 4.2p1, 12/8/96 (Mac only) --------------
+
+1/17/97 (bug fix) Fixed bug where the Tk clipboard was not in sync
+with the Macintosh clipboard on start-up.  (RJ)
+
+----------------- Released 4.2p2, 1/31/97 --------------
+
+----------------------------------------------------------
+Changes for Tk 4.2 go above this line.
+Changes for Tk 4.3 go below this line.
+----------------------------------------------------------
+
+9/19/96 (improvement) Implemented table driven mechanism for deciding
+whether a command is safe. If it is added by Tk_Init and it appears in the
+table then it is kept, otherwise it is removed in a safe interpreter. (JL)
+
+10/18/96 (new feature) Added support for application embedding:
+    - Frame and toplevel widgets now have a -container option, which
+      turns the widget into a container.
+    - Toplevel widgets have a -use option for requesting that the
+      widget be embedded in another application.
+    - Wish also supports a -use command-line option.
+Embedding is fully supported under Unix, but the implementation is
+not complete under Windows or the Macintosh (it works just well
+enough to support the Tcl/Tk plugin). (JO)
+
+10/22/96 (bug fix) The commands "winfo rootx" and "winfo rooty" didn't
+work for non-toplevel windows in embedded applications: they returned
+the coordinates of the nearest toplevel. (JO)
+
+12/02/96 (new feature) Implemented Safe Tk. Tk can now be loaded into a
+safe interpreter that has been created with tcl_safeCreateInterp, by
+calling load {} Tk interpname. (JL)
+
+12/02/96 (new feature) A safe Tk interpreter can no longer generate
+postscript output from a canvas. (JL)
+
+12/02/96 (new feature) Added -channel option to photo command to allow
+image data to be read from a channel. This is useful in safe Tk
+interpreters where the data cannot be read directly from a file. (JL)
+
+----------------------------------------------------------
+Changes for Tk 4.3 go above this line.
+Changes for Tk 8.0 go below this line.
+----------------------------------------------------------
+
+9/1/96 (new features) The font mechanism in Tk has been completely
+reworked:
+    - Font names need not be nasty X LFDs: more intuitive names like
+      {Times 12 Bold} can also be used.  See the manual entry font.n
+      for details.
+    - Font requests always succeed now.  If the requested font is not
+      available, Tk finds the closest available font and uses that one.
+    - Tk now supports named fonts whose precise attributes can be
+      changed dynamically.  If a named font is changed, any widget
+      using that font updates itself to reflect the change.
+    - There is a new command "font" for creating named fonts and querying
+      various information about fonts.
+    - There are now officially supported C APIs for measuring and
+      displaying text.  If you use these APIs now, your code will
+      automatically handle international text when internationalization
+      is added to Tk in a future release.  See the manual entries
+      MeasureChar.3, TextLayout.3, and FontId.3.
+    - The old C procedures Tk_GetFontStruct, Tk_NameOfFontStruct, and
+      Tk_FreeFontStruct have been replaced with more portable procedures
+      Tk_GetFont, Tk_NameOfFont, and Tk_FreeFont.
+      *** POTENTIAL INCOMPATIBILITY ***
+(CS)
+
+9/24/96 (bug fix) Under Windows, transient windows would be destroyed
+if their master was destroyed, even if the transient window was not a
+child of the master. (SS)
+
+10/18/96 (new features) A -menu option has been added to the toplevel
+widget command, which allows a menu to operate as a menubar. On the
+Macintosh, the menubar is displayed accross the top of the main monitor,
+just like with other applications. Under Windows and Unix, the menu is
+attached to the toplevel window. Also, changed some semantics.  
+Tearoff menus will now reflect changes to the menu it was 
+torn off from, and are deleted when the master menu is
+deleted. Tearoffs also reflect more look-and-feel of the 
+platforms they are running on. (SRP)
+
+10/31/96 (bug fix) Under Windows, missing system cursors would
+generate an error instead of falling through to the Tk cursor of the
+same name. (SS)
+
+11/7/96 (feature change) Under Unix, default borderwidth is now 1 to
+more closely approximate CDE.  (SS)
+Note: this change was undone on 6/12/97, restoring the default border
+width to 2 again.  (JO)
+
+11/7/96 (new feature) The button widget now supports a -default option
+that draws a platform specific default ring around the widget. (SS)
+
+11/7/96 (feature change) Under Windows, buttons and scrollbars now
+have native look and feel.  This affects the default class bindings
+and the way the some configuration options are interpreted.  Refer to
+the widget manual pages for more details. (SS)
+*** POTENTIAL INCOMPATIBILITY ***
+
+11/19/96 (bug fix) Under Windows, images were incorrectly drawn on
+16-bit displays. (SS)
+
+11/19/96 (bug fix) Under Windows, the class name for the main window
+(.) was not properly generated from argv0. (SS)
+
+11/20/96 (bug fix) Fixed a couple of bugs in the Canvas widget.  The
+postscript file is now created with the correct permissions.  Also,
+the prolog is now properly included in all cases. (RJ)
+
+11/22/96 (bug fix) Under Windows, the initial directory and file names
+were not properly translated before being passed to the system
+open/save file dialogs.  So forward slashes were not converted to
+backslashes, and tilde substitution was not performed.  (SS)
+
+11/25/96 (feature change) Under Windows and Macintosh, the selection
+highlight is now hidden whenever an entry or text widget loses focus.
+Also, the previous selection information is not lost when a new
+selection is made in a different widget. (SS)
+
+11/26/96 (new feature) Added support for images as primitive types in
+text widgets. (SU)
+
+11/30/96 (configuration improvement) Modified configure.in to handle the
+case where Tcl and Tk are installed in different places by including both
+their library directories in the library search path for Tk. (JO)
+
+12/3/96 (bug fixes) Fixed two bugs related to canvas lines that caused
+the screen to be incorrectly refreshed, leaving garbage on the screen.
+One bug was related to lines with width zero, and the other was
+related to lines with very long miters. (JO)
+
+12/4/96 (bug fix) The "update" command was only syncing the display
+for its main window.  Changed to sync all displays. (JO)
+
+12/5/96 (bug fix) Color deallocation would occasionally cause a panic
+under Windows. (SS)
+
+12/5/96 (bug fix) Errors during startup were silently discarded under
+Windows. (SS)
+
+12/5/96 (bug fix) Errors during startup were silently discarded under
+Windows. (SS)
+
+12/11/96 (bug fix) Text widgets weren't considering the -spacing1
+and -spacing2 options when computing their desired geometry. (JO)
+
+12/12/96 (feature change) Option menus using tk_optionMenu were
+created with command entries that set the option menu's variable in a
+command string. This has been changed so that the option menu's
+entries are now radiobutton entries so that the entries that matches
+the variable is now checked when the menu is posted. (SRP)
+
+12/12/96 (feature change) The destroy command no longer returns an
+error when a window does not exist. (SRP)
+
+12/13/96 (new feature) grid row/column-configure accepts a list of
+indices in addition to a single index. (SU)
+
+12/17/96 (bug fix) Under Windows, command line was not being parsed
+correctly if it contained the literal characters \" (CS)
+
+12/17/96 (feature change) Native Windows labels do not get a focus-ring
+border.  (CS)
+
+12/17/96 (bug fix) Under Windows, colors specified as "#XXYYZZ" where XX, YY, 
+or ZZ were not valid hex digits were getting a random color value instead of
+being an error. (CS) 
+
+----------------- Released 8.0a1, 12/17/96 -----------------------
+
+12/23/96 (bug fix) Fixed two menu bugs:
+    - Menus could get stacked below other windows so that they weren't
+      visible when posted (especially under olvwm and fvwm).
+    - Under olvwm if you pressed button 1 over an entry in a new-style
+      menubar, the menu didn't appear until you moved the mouse slightly.
+(JO)
+
+1/6/97 (bug fix) Focus could accidentally get grabbed by an application
+away from the rightful focus owner if the focus recently changed from one
+application to another. (JO)
+
+1/6/97 (bug fix) Under Windows, the console was appearing even for
+non-interactive applications.  This was a side effect of a general
+problem with the wm state of windows that were being mapped for the
+first time. (SS)
+
+1/6/97 (bug fix) Under Windows, the initialization code was not
+looking in the right directory for the Tk libraries when the program
+being run was not in the Tcl installation heirarchy. (SS) 
+
+1/8/97 (bug fix) Under Windows, the windows were not being unmapped
+properly, which led to strange packer behavior. (SS)
+
+1/8/97 (bug fix) The "winfo containing" command (and the Tk_CoordsToWindow
+procedure) didn't work properly on Unix in the presence of embedding or
+menubars. (JO)
+
+1/15/97 (bug fix) Invoking "destroy ." as the command from a menu would
+cause Tk to crash because TkMainInfo was freed before menu released its
+resources.  This bug had already been fixed for scrollbars and buttons. (CS)
+
+1/15/97 (bug fix) Tk is now working under Win32s again, including Win32 
+version 1.25.  Fixed separate problems in fonts and dialogs. (CS)
+
+1/15/97 (feature change) Under Windows, font sizes are now specified in 
+points, not pixels.  The mapping between pointsize and pixels depends on
+Windows having accurate metrics for the monitor (plug&play helps).  Font
+metrics are still reported in pixels. (CS)
+
+1/21/97 (bug fix)  Grid no longer reports rows or columns "out of range"
+when requesting their constraints. (SAU)
+
+1/21/97 (bug fix)  Fixed some window manager related bugs on the
+Macintosh.  Now better support global grabs. (RJ)
+
+1/21/97 (bug fix) For Windows: Fixed problems with canvas items that
+used end caps.  Fixed arc implementation to more closely approximate
+X.  Stippling now works properly on fat lines. (SS)
+
+1/21/97 (bug fix) Small interlaced GIF images were not properly
+decoded. (SS)
+
+1/21/97 (bug fix) More changes to image code to try to handle 16-bit
+displays properly under Windows. (SS)
+
+1/21/97 (bug fix) Numerous display bugs on Unix and Macintosh are now
+fixed. Numerous binding problems for menubars under Unix are now
+fixed. Deletion of menu separators under Windows is now fixed. (SRP)
+
+----------------- Released 8.0a2, 1/24/97 -----------------------
+
+1/29/97 (feature change) The -transient field for menus is no longer
+supported.  There is now a -type field which is used to achieve the
+same purpose that the -transient field accomplished. When a menu is
+created, the -type field controls whether the menu is a normal
+pull-down menu, a floating tearoff menu or a menubar. This option is
+normally only used by the library code and internally by the menubar
+code. (SRP)
+*** POTENTIAL INCOMPATIBILITY ***
+
+2/5/97 (feature change) Changed the photo image mechanism to use
+Tcl_Channels instead of FILE * as an argument to image matching
+functions.  The change will make it much easier to write cross
+platform image types in Tk.  Note: FILE * is no longer used anywhere
+in Tk. (RJ)
+*** POTENTIAL INCOMPATIBILITY ***
+
+2/7/97 (enhancement) Were not allowed to bind to virtual events inside of
+canvas or text widget (e.g., "$canvas bind all <<foo>> {script}" or
+"$text tag bind sel <<foo>> {script}"); it would return an error
+disallowing that binding.  Now _can_ bind to a virtual event, but that
+binding inside of the canvas or text widget will only fire if the
+underlying virtual event definition is of type key, button, motion,
+enter, or leave; all other physical event types get filtered out by the
+widget before the virtual event mapping is done. (CS)
+
+2/22/97 (bug fix) Under Unix, "wm geometry +-20+-30" didn't work. (JO)
+
+2/24/97 (bug fix) The photo image didn't always zero out enough of its
+pixel and dither correction arrays. (JO)
+
+2/25/97 (bug fix) Fixed focus problem that could cause "BadMatch (invalid
+parameter attributes)" in X_SetInputFocus requests on Unix. (JO)
+
+2/25/97 (bug fix and new feature) Added new "gray75" bitmap, fixed
+"gray25" bitmap to really be 25% on (due to an ancient mistake, it
+had been only 12% on). (JO)
+
+2/28/97 (bug fix) Windows: made embedding work again on Win32 platform.
+Prevent iconification, deiconinification on embedded windows. (JL)
+
+3/4/97 (new feature) Added the ability to manipulate the Apple and
+Help menus on the Macintosh; the system menu on Windows; and to have a
+right justified Help menu on Unix. See the documentation for menu.n
+for more details. (SRP)
+
+3/4/97 (bug fix) Prevented core dump at exit if a <Destroy> binding on "."
+gets invoked from destroying a nested widget and the binding causes the
+interpreter to be deleted. The core dump was being caused by the
+interpreter not being Tcl_Preserve'd during the destroy of ".". (JL)
+
+3/4/97 (bug fix) Under Unix, when embedded Tk is running in a separate
+process, correctly handle a race condition: ignore cross-over messages from
+the X server for windows that Tk thinks it had already deleted, when the
+containing process deletes its container window. Some other race conditions
+still remain, e.g. with pixmaps, colormaps and images. (JL)
+
+3/10/97 (bug fix) Prevented core dump in generic console code due to
+following a NULL pointer when the console interpreter was already deleted.
+This may happen due to different orders of deletion possible at exit. (JL)
+
+3/10/97 (bug fix) Fixed bug on Mac and Windows that caused time to be
+ignored when considering if a single click was actually a double
+click. (RJ)
+
+3/11/97 (feature change) A major oversight has been that although it was
+documented that the Tk programmer was asking for a font in points (1/72 of an
+inch), under Unix and Mac Tk was actually asking for a font in pixels, while
+only under Windows was it using points.  This caused applications to appear
+much larger when run under Windows.  Now, on all platforms the (purportedly)
+correct size in points is used when asking for fonts.  However, for
+compatibility with existing tk4.2 applications that depend on fonts being of
+specified pixel size, XLFDs retain their incorrect behavior of getting a
+font in pixels.  (CCS)
+*** POTENTIAL INCOMPATIBILITY ***
+
+3/13/97 (new feature) "tk scaling" command to setup the mapping between
+pixels and points.  This scaling factor is used by all widgets that accept
+ruler distances, not just fonts. (CCS)
+
+3/24/97 (new feature) Added "-columnbreak" option to menu
+entries. When this value is "1", the entry will appear at the top of a
+new column in a non-menubar menu. Also added "-hideMargin". Together
+with "-columnBreak", menus with palettes are now possible. (SRP)
+
+3/26/97 (new features and bug fix) Titles for tearoff menus were
+broken on the Mac and Windows. Added the ability to set the title of a
+menu when it gets torn off and override Tk's automatic generation of
+the title.  On the Macintosh, whenever a menu
+label contains three dots in a row "...", the menu will instead
+display the elipses character 'É'.  (SRP)
+
+3/27/97 (bug fixes) When a menu had an error executing a postcommand,
+the error information was getting lost. On Windows, a set of
+menubuttons was not highligting properly when clicking between
+windows. On Windows, post commands were getting executed twice for
+popup menus.  On Macintosh, fixed problem where menubars were not
+always current. (SRP)
+
+4/11/97 (new feature) Menubuttons now have a direction flag which
+controls where the menu popups up relative to the button. (SRP)
+
+4/24/97 (bug fix) Transient windows did not obey the resizable setting
+under Windows. (SS)
+
+4/24/97 (bug fix) wm geometry did not correctly parse negative
+coordinates. (SS)
+
+4/29/97 (bug fix) Changed the canvas polygon implementation to only
+report the coordinates specified by the end user not the automatically
+generated end point of a self closing polygon. (RJ)
+*** POTENTIAL INCOMPATIBILITY ***
+
+4/23/97 (feature change) Loosened the rules on parsing font names so that
+unix-centric fonts in scripts don't break when run on Windows or Mac.
+(1) Previously, an XLFD had to specify font name, weight, slant, and size;
+now, a minimal XLFD (such as "*-times-*") will be accepted, and all
+unspecified attributes will be given default values.  (2) Previously, in the
+{name size style ...} format, only the style was optional; now both the size
+and the style are optional; this solves the problem of old scripts that 
+contain specifications of the form "-font fixed" or "-font times". (CCS)
+
+5/7/97 (new feature) Menus now send a virtual event <<MenuSelect>>
+when an item is highlighted in a menu. Applications can use this to
+implement context-sensitive help. (SRP)
+
+5/14/97 (bug fix) Fixed a race condition in the focus code where focus
+could be taken away from a window incorrectly.  Scenario is that the main
+window creates a toplevel and assigns focus to it.  When the user moves the
+mouse from the main window into the toplevel there was a race between
+two different kinds of focus events. (BW)
+
+5/20/97 (bug fix) Fixed bug where the clipboard was not rendered before
+the application exited. (SS)
+
+5/22/97 (feature change) When a Tk8.0 menu is configured, all menus
+derived from it (menubars, tearoff) mirror the changes. This was not
+true for the "-tearoff" flag. In Tk4.6, tearoff menus had the
+"-tearoff" flag turned off. Now, the "-tearoff" flag is tracked just
+as the other options are. Tearoff menus and menubars with the
+"-tearoff" option set will not display the tearoff item. This means
+that a given menu entry for a menu and a tearoff of that menu will
+match now. (SRP)
+*** POTENTIAL INCOMPATIBILITY ***
+
+----------------- Released 8.0b1, 5/27/97 -----------------------
+
+5/30/97 (bug fix) Made the options to the grid command shortcut-able.
+Ie. You can now use -stick, in addition to -sticky. (RJ)
+
+6/2/97 (bug fix) Fixed bug in startup code that caused a problem in
+finding the library files when they are installed in a directory
+containing a space in the name. (SS)
+
+6/2/97 (bug fix) Virtual events associated with <Enter>/<Leave> in text 
+widget tag caused panic. (CCS)
+
+6/6/97 (bug fix) On some systems, struct timeval.tv_sec is unsigned. (SS)
+
+6/6/97 (feature change) Changed -default option on buttons to take
+three states: normal, active, disabled.  This allows apps to have a
+row of buttons where the default ring moves between buttons without
+changing the geometry of the buttons.  See the button.n manual page
+for more details. (SS)
+*** POTENTIAL INCOMPATIBILITY with Tk 8.0b1, but not with Tk 4.2 ***
+
+6/9/97 (bug fix) Canvas postscript printing now works for bitmaps
+under Windows. (SS)
+
+6/10/97 (bug fix) Fixed bug in bindings for listboxes where state wasn't
+being properly initialized on Shift-1 button presses. (JO)
+
+6/11/97 (bug fix) Text widget display code did not include internal
+padding in the damage calculation for borders leading to unrefreshed
+sections on Windows and Mac. (SS)
+
+6/12/97 (feature reversal) Changed default border widths under Unix
+back to 2 again.  This reverses the change made on 11/7/96. (JO)
+
+6/13/97 (bug fixes) In canvas text item: the insertion cursor wasn't shown
+if insertion point was at end of text item, it was impossible to click to
+position the insertion point after the last character, and @x,y indices were
+computed incorrectly if -scrollregion had been specified and canvas was
+scrolled. (CCS)
+
+6/13/97 (bug fix) Hitting up/down arrows in a text widget packed in a 
+toplevel window created with the "-screen" option would cause an error dialog
+to pop up. (CCS)
+
+6/12/97 (bug fix) Fixed bug in canvas text items where multi-line
+selections were not highlighted properly.  This bug existed only in
+earlier releases of Tk 8.0.  (JO)
+
+6/16/97 (bug fix) In some obscure cases, canvas window items could
+accidentally specified a 0x0 size for the window, which caused a
+BadValue error under X. (JO)
+
+6/17/97 (bug fix) Tk buttons on the Macintosh will now correctly
+draw under MacOS 8.0. (RJ)
+
+6/18/97 (feature change) Changed the way highlights are drawn in text
+widgets so that the empty space to the left of a line is highlighted
+whenever the leftmost character of the line is highlighted (the empty
+space didn't used to be highlighted).  This produces a neater left
+edge when several lines are selected.  (JO)
+
+6/18/97 (bug fix) Tk was using the wrong system colors to draw various
+widgets under Windows. (SS)
+
+6/19/97 (bug fix) Under Windows, the "wm transient" and "wm overrideredirect"
+subcommands can now be applied to a toplevel to change its window
+style at any time during the life of the window. (SS)
+
+6/19/97 (feature change) All GIF and XBM images needed for the "TK"
+file dialog box are included in-line in tkfbox.tcl. (IL)
+
+6/27/97 (bug fix) Revamped focus code to eliminate most XSetInputFocus
+calls from the FilterEvent procedure.  This moves the implementation back
+towards the Tk 4.2 implementation, but adds embedding support.  There is
+still a known bug with twm's NoTitleFocus and embedded windows.  However,
+the races in a2 and the funny focus stealing in b1 are gone. (BW)
+
+6/25/97 (bug fix) Error message was not properly reported when using
+button 'toggle'. (DL)
+
+6/25/97 (bug fix) Removed one source of memory corruption in tkGrid.c code
+(fixes what was exercised by "grid col . 0 -w 1; grid col . 0 -w 25") (DL)
+
+----------------- Released 8.0b2, 6/30/97 -----------------------
+
+7/1/97 (bug fix) Menu shortcut and tearoff reported problem fixed. (DL)
+
+7/1/97 (new feature) TK_BUILD_SHARED flag set in tkConfig.sh
+when Tk has been built with --enable-shared. TK_SRC_DIR added.
+A new tkLibObjs make target, echoing the list of the .o's needed
+to build a tk library, is now provided. (DL)
+
+7/9/97 (bug fix) Fixed Tk_CreateFileHandler and Tk_DeleteFileHandler
+macros to directly call the Tcl equivalents. (JL)
+
+7/10/97 (bug fix) On the Mac, if the binding for <<MenuSelect>> was
+drawing, the drawing could bleed over into the menus. This is now
+fixed. (SRP)
+
+7/10/97 (bug fixes) Removed duplicate code related to Tk_SafeInit,
+made a single init script handling both cases. (DL)
+
+7/10/97 (feature change) On Unix, to be able to load Tk into a safe
+interp you need to set the env(DISPLAY) var. Some API should be
+added to allow master crontrol over Tk instantiation. (DL)
+
+7/11/97 (new feature) On the Mac, menus that are too big for the
+screen will now scroll. This is part of the interface on the Mac,
+impossible under Windows, and is not done for Unix. (SRP)
+
+7/21/97 (bug fix) After fixing the bug that in canvas text item the insertion
+cursor wasn't shown if insertion point was at end of text item, introduced a
+different bug in where clicking in entry widget with 0 characters would
+crash or display garbage. (CCS) 
+
+7/22/97 (bug fix) If there were a whole bunch of returns or tabs in a row in
+a canvas text item, then the temporary buffer used when outputting
+postscript could overflow and overwrite the stack. (CCS)
+
+7/23/97 (feature change) Reenabled "tkwait" in the Safe Tk base. (JL)
+
+7/24/97 (bug fix) Single init script for both Win and Unix.
+new library/safetk.tcl using features from new tcl safe.tcl (DL)
+
+7/30/97 (feature change) As a result of native menus, you can no
+longer drag through a frame of menubuttons on Macintosh and Windows
+and have the menus pop down. You can still click on individual
+menubuttons and their menus will pop down.  Applications needing to
+present a menubar should consider using the new "-menu" configuration
+of the toplevel widget to set up menubar which behaves correctly on
+Macintosh, Windows and X Windows. (SRP)
+
+7/31/97 (bug fix) Tk widget commands can now safely be hidden commands.
+Previously destroying the widget would potentially leave dangling pointers
+and destroy an exposed command instead of a hidden one if an exposed
+command by that name existed. (JL)
+
+7/31/97 (bug fix) On Windows, popup menus were not tracking the right mouse
+button correctly if it was used to invoke the menu. On Unix, tearoff
+menus were stealing focus when the mouse moving over them even when
+focus following was turned off. (SRP)
+
+8/4/97 (bug fix) Fixed problem under USENIX where raising a toplevel
+window could cause an X error if the window had just been withdrawn.  (JO)
+
+8/4/97 (feature change) tkerror and bgerror are not anymore hard links
+maintained by the Tcl core. The implementation of bgerror provided by
+Tk tries, for backward compatibility only, to to call "tkerror" and
+if that fails, falls back to the usual dialog and stack trace option 
+posting. You can thus still use either "bgerror" or "tkerror" as your
+application error handling proc, but using "bgerror" is strongly
+recommended as support for "tkerror" will eventually vanish in upcoming
+releases. (DL)
+*** POTENTIAL INCOMPATIBILITY with scripts that were using
+    the actual hardlink implementation 'features' and with
+    scripts (if any) that would be calling the default "tkerror" to
+    simulate error messages (use "bgerror" instead)                  ***
+
+8/7/97 (feature change/addition) Removed the gif files used for the
+Open dialog box on UNIX (they were previously made inline).  Added a
+new images directory that includes several images of the Tcl and Tcl
+Powered logos. (RJ)
+
+8/7/97 (bug fix) Fixed focus to deal with embedding when there is
+no window manager. (BW)
+
+8/8/97 (bug fix) Fixed bug in photo image code where photo images from
+different interpreters could get confused if they had the same name. (JO)
+
+8/8/97 (new feature) Added new procedure Tk_GetImageMasterData for
+mapping image names to master data.  (JO) 
+
+8/8/97 (feature change) Modified Tk_FindPhoto procedure to require
+extra "interp" argument (needed for bug fix above).  (JO)
+*** POTENTIAL INCOMPATIBILITY ***
+
+8/8/97 (bug fix) Fixed problems under Windows renaming toplevels with
+menubars. Fixed problems on all platforms renaming menu widgets and
+using new menus of the same name as an old one as cascades. Fixed a
+cosmetic problem with tearoff menus. (SRP)
+
+8/13/97 (bug fixes) Fixed "-from" option for the "image create" and
+"imageName read" commands for GIF images, which didn't used to work
+correctly.  Also made transparency work correctly for GIF images
+without the TRANSPARENT_GIF_COLOR hack; TRANSPARENT_GIF_COLOR is
+now ignored.  These fixes were provided by Jan Nijtmans. (JO)
+
+8/13/97 (new feature) added safe::loadTk command to load Tk in a
+safe slave interpreter. See the loadTk.n manual page for more
+details. (DL)
+
+----------------- Released 8.0, 8/18/97 -----------------------
+
+8/22/97 - (bug fix) Fixed syntax error in tk_popup; option menus now
+popup over their selected items like they did in tk4.2. Fixed problem
+where cascades sometimes did not work on X. On X, menubars with
+checkbuttons and radiobuttons in them would infinite loop when
+mappped. (SRP)
+
+8/27/97 (new feature) Added support for new X11R6 colors under Windows
+and Mac platforms. (SS)
+
+8/29/97 (bug fix) Wish crashed if stdin was closed. (SS)
+
+9/10/97 (bug fix) "font actual {helvetica 10} -displayof ." wasn't taking
+into account the "-displayof" option.  This problem also existed for the
+"font metrics" and "font measure" commands. (CCS)
+
+9/16/97 (new feature) Added "resource delete" and "resource files"
+command to the Mac.  Also fixed "resource write" when the resource
+was specified by id and already existed. (JI)
+
+9/16/97 (bug fix) Added null bindings to <Command-KeyPress> for the
+text and entry widget on the Macintosh.  This prevents unbound command
+key sequences from having the character echoed to the widget. Also
+fixed Cut & Copy bindings.  (JI) (RJ)
+
+9/18/97 (bug fix) Revamped Macintosh focus code.  Cut, Copy & Paste
+virtual events now go to the correct (focus) window. (RJ)
+
+9/19/97 (bug fix) Made Macintosh tearoff menus non-resizable. (RJ)
+
+10/9/97 (bug fix) Image code could cause crashes during "exit" under
+some conditions (such as an image named "place").  (JO)
+
+10/9/97 (bug fix) Fixed bug that sometimes prevented listboxes from
+scrolling far enough horizontally to see the rightmost character.  (JO)
+
+10/9/97 (bug fix) Default font for new canvas text items was hardcoded to
+"Helvetica 12" instead of using DEF_CANVTEXT_FONT defined in
+tk{platform}Default.h like all the other widget settings.  (CCS)
+
+10/10/97 (bug fix) In canvas text items, if the text ended with a \n, it
+was not counted in the bbox height, as it did in tk4.2.  This caused
+"hello\n" to be the same height as "hello" and you couldn't see the
+cursor positioned on the next line. (CCS)
+
+10/10/97 (bug fix) The grid geometry manager didn't always properly
+forget about windows after a "grid forget" or "grid remove" command:
+the windows could reappear on the screen later.  (JO)
+
+10/13/97 (bug fix) Selection could not be restored to a text widget
+after "selection clear" on Windows. (SS)
+
+10/14/97 (bug fix) If a canvas had contained windows that were off-screen,
+the windows could sometimes reappear (in the wrong place) if the canvas was
+enlarged.  (JO)
+
+10/20/97 (bug fix) Omitting the arguments to the text widget "mark
+gravity" option caused a crash. (SS)
+
+10/21/97 (bug fix) Tk did not reset the result after native dialog
+modal loops on Window so background events could perturb the dialog
+result. (SS)
+
+10/23/97 (bug fix) Memory leak in unix's TkpGetFontFamilies.  Thanks
+to James Bonfield for the fix. (DL)
+
+10/27/97 (bug fix) Fixed event reporting for the Mac during a grab
+when the pointer was out of the toplevel window. (RJ)
+
+10/28/97 (bug fix) Under Unix, override-redirect was getting set
+incorrectly for menus, so that "wm overrideredirect" returned 0. (JO)
+
+10/28/97 (bug fix) Under Unix, focus code could sometimes cause the
+display to deadlock (it wasn't flushing the output buffer after issuing
+an ungrab command). (JO)
+
+10/28/97 (bug fix) If a PPM image file wasn't complete (e.g. it
+consisted of nothing but space characters) Tk entered an infinite loop
+reading the header. (JO)
+
+10/28/97 (bug fixes) On the Mac, menubars assigned to toplevels would
+disappear after a menu item was invoked from them. On Windows,
+clicking a system menu with added items and then again with a
+different set of added items would crash. On all platforms, a command
+menu entry that caused the entry to be deleted, another one created in
+its place, and the replacement deleted would cause a panic. On Unix,
+<<MenuSelect>> event bindings were firing every time the mouse moved,
+instead of everytime the active menu item changed. (SRP)
+
+10/27/97 (bug fix) If a particular race condition occurred under Windows,
+Tk would crash complaining about trying to free a color that wasn't 
+allocated. (SS)
+
+10/28/97 (bug fix) Under Windows, button grabs did not report motion 
+events that occurred outside of Tk windows. (SS)
+
+10/28/97 (bug fix) Fixed incorrect display of transparent images on
+the Macintosh. (JI)
+
+10/29/97 (bug fix) Reworked the handling of out-of-range indices in
+the widget command for listboxes: there were all sorts of quirks
+before (e.g., ".l delete -1" actually deleted the first element
+of the listbox). (JO)
+
+10/29/97 (bug fix) Fixed crash on the Macintosh that could occur if a
+window is moved before it is mapped where the X window was created but
+the Macintosh port was not. (RJ)
+
+10/29/97 (bug fix) Fixed several errors in how wm state was maintained
+on the Macintosh.  Tk now also will iconify a toplevel window on the
+Mac if the new Appearance Manager is present. (RJ)
+
+10/28/97 (bug fixes) In canvas' postscript command: User name 
+information was leaked in safe interpreters on Unix (security fix).
+Errors while reading prolog.ps were not propagated and the error 
+message was mixed with partial data. Note: postscript output does
+not work in safe interpreters on unix and windows. (DL)
+
+10/28/97 (bug fix) Safe Tk interps on unix were leaking env(DISPLAY). (DL)
+
+10/31/97 (bug fix) Fixed problems related to the input focus when one
+application had windows open simultaneously on several displays. (JO)
+
+10/31/97 (bug fix) Fixed several problems with traversal of menus via
+the keyboard under Unix. (SRP)
+
+11/4/97 (bug fix) Fixed various word-size related problems for 64-bit
+architectures. (SS)
+
+11/5/97 (bug fix) Embedding on Windows was using freed data (crashing
+in safe.test with TCL_MEM_DEBUG). NB: Embedding is still not fully 
+implemented on Windows ! (It works mostly when Tk is embeded into it's
+own Tk frame (safe::loadTk case), but not well with respect to resizing
+with a toplevel container or with an external process). (DL)
+
+----------------- Released 8.0p1, 11/7/97 -----------------------
+
+11/20/97 (bug fix) Fixed bug on the Mac where the "package require"
+command caused menus to stop working. (JI)
+
+11/20/97 (bug fix) Fixed bug in rendering transparent gifs on Text
+widgets. (JI)
+
+11/20/97 (enhancement) Made the changes required to work with the new
+Apple Universal Headers V. 3.0 so we can compile with CW Pro 2.0 (JI)
+
+----------------- Released 8.0p2, 11/25/97 -----------------------