update tcl/tk

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diff --git a/tk8.6/library/text.tcl b/tk8.6/library/text.tcl
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+++ b/tk8.6/library/text.tcl
@@ -0,0 +1,1207 @@
+# text.tcl --
+#
+# This file defines the default bindings for Tk text widgets and provides
+# procedures that help in implementing the bindings.
+#
+# Copyright (c) 1992-1994 The Regents of the University of California.
+# Copyright (c) 1994-1997 Sun Microsystems, Inc.
+# Copyright (c) 1998 by Scriptics Corporation.
+#
+# See the file "license.terms" for information on usage and redistribution
+# of this file, and for a DISCLAIMER OF ALL WARRANTIES.
+#
+
+#-------------------------------------------------------------------------
+# Elements of ::tk::Priv that are used in this file:
+#
+# afterId -		If non-null, it means that auto-scanning is underway
+#			and it gives the "after" id for the next auto-scan
+#			command to be executed.
+# char -		Character position on the line;  kept in order
+#			to allow moving up or down past short lines while
+#			still remembering the desired position.
+# mouseMoved -		Non-zero means the mouse has moved a significant
+#			amount since the button went down (so, for example,
+#			start dragging out a selection).
+# prevPos -		Used when moving up or down lines via the keyboard.
+#			Keeps track of the previous insert position, so
+#			we can distinguish a series of ups and downs, all
+#			in a row, from a new up or down.
+# selectMode -		The style of selection currently underway:
+#			char, word, or line.
+# x, y -		Last known mouse coordinates for scanning
+#			and auto-scanning.
+#
+#-------------------------------------------------------------------------
+
+#-------------------------------------------------------------------------
+# The code below creates the default class bindings for text widgets.
+#-------------------------------------------------------------------------
+
+# Standard Motif bindings:
+
+bind Text <1> {
+    tk::TextButton1 %W %x %y
+    %W tag remove sel 0.0 end
+}
+bind Text <B1-Motion> {
+    set tk::Priv(x) %x
+    set tk::Priv(y) %y
+    tk::TextSelectTo %W %x %y
+}
+bind Text <Double-1> {
+    set tk::Priv(selectMode) word
+    tk::TextSelectTo %W %x %y
+    catch {%W mark set insert sel.first}
+}
+bind Text <Triple-1> {
+    set tk::Priv(selectMode) line
+    tk::TextSelectTo %W %x %y
+    catch {%W mark set insert sel.first}
+}
+bind Text <Shift-1> {
+    tk::TextResetAnchor %W @%x,%y
+    set tk::Priv(selectMode) char
+    tk::TextSelectTo %W %x %y
+}
+bind Text <Double-Shift-1>	{
+    set tk::Priv(selectMode) word
+    tk::TextSelectTo %W %x %y 1
+}
+bind Text <Triple-Shift-1>	{
+    set tk::Priv(selectMode) line
+    tk::TextSelectTo %W %x %y
+}
+bind Text <B1-Leave> {
+    set tk::Priv(x) %x
+    set tk::Priv(y) %y
+    tk::TextAutoScan %W
+}
+bind Text <B1-Enter> {
+    tk::CancelRepeat
+}
+bind Text <ButtonRelease-1> {
+    tk::CancelRepeat
+}
+bind Text <Control-1> {
+    %W mark set insert @%x,%y
+    # An operation that moves the insert mark without making it
+    # one end of the selection must insert an autoseparator
+    if {[%W cget -autoseparators]} {
+	%W edit separator
+    }
+}
+# stop an accidental double click triggering <Double-Button-1>
+bind Text <Double-Control-1> { # nothing }
+# stop an accidental movement triggering <B1-Motion>
+bind Text <Control-B1-Motion> { # nothing }
+bind Text <<PrevChar>> {
+    tk::TextSetCursor %W insert-1displayindices
+}
+bind Text <<NextChar>> {
+    tk::TextSetCursor %W insert+1displayindices
+}
+bind Text <<PrevLine>> {
+    tk::TextSetCursor %W [tk::TextUpDownLine %W -1]
+}
+bind Text <<NextLine>> {
+    tk::TextSetCursor %W [tk::TextUpDownLine %W 1]
+}
+bind Text <<SelectPrevChar>> {
+    tk::TextKeySelect %W [%W index {insert - 1displayindices}]
+}
+bind Text <<SelectNextChar>> {
+    tk::TextKeySelect %W [%W index {insert + 1displayindices}]
+}
+bind Text <<SelectPrevLine>> {
+    tk::TextKeySelect %W [tk::TextUpDownLine %W -1]
+}
+bind Text <<SelectNextLine>> {
+    tk::TextKeySelect %W [tk::TextUpDownLine %W 1]
+}
+bind Text <<PrevWord>> {
+    tk::TextSetCursor %W [tk::TextPrevPos %W insert tcl_startOfPreviousWord]
+}
+bind Text <<NextWord>> {
+    tk::TextSetCursor %W [tk::TextNextWord %W insert]
+}
+bind Text <<PrevPara>> {
+    tk::TextSetCursor %W [tk::TextPrevPara %W insert]
+}
+bind Text <<NextPara>> {
+    tk::TextSetCursor %W [tk::TextNextPara %W insert]
+}
+bind Text <<SelectPrevWord>> {
+    tk::TextKeySelect %W [tk::TextPrevPos %W insert tcl_startOfPreviousWord]
+}
+bind Text <<SelectNextWord>> {
+    tk::TextKeySelect %W [tk::TextNextWord %W insert]
+}
+bind Text <<SelectPrevPara>> {
+    tk::TextKeySelect %W [tk::TextPrevPara %W insert]
+}
+bind Text <<SelectNextPara>> {
+    tk::TextKeySelect %W [tk::TextNextPara %W insert]
+}
+bind Text <Prior> {
+    tk::TextSetCursor %W [tk::TextScrollPages %W -1]
+}
+bind Text <Shift-Prior> {
+    tk::TextKeySelect %W [tk::TextScrollPages %W -1]
+}
+bind Text <Next> {
+    tk::TextSetCursor %W [tk::TextScrollPages %W 1]
+}
+bind Text <Shift-Next> {
+    tk::TextKeySelect %W [tk::TextScrollPages %W 1]
+}
+bind Text <Control-Prior> {
+    %W xview scroll -1 page
+}
+bind Text <Control-Next> {
+    %W xview scroll 1 page
+}
+
+bind Text <<LineStart>> {
+    tk::TextSetCursor %W {insert display linestart}
+}
+bind Text <<SelectLineStart>> {
+    tk::TextKeySelect %W {insert display linestart}
+}
+bind Text <<LineEnd>> {
+    tk::TextSetCursor %W {insert display lineend}
+}
+bind Text <<SelectLineEnd>> {
+    tk::TextKeySelect %W {insert display lineend}
+}
+bind Text <Control-Home> {
+    tk::TextSetCursor %W 1.0
+}
+bind Text <Control-Shift-Home> {
+    tk::TextKeySelect %W 1.0
+}
+bind Text <Control-End> {
+    tk::TextSetCursor %W {end - 1 indices}
+}
+bind Text <Control-Shift-End> {
+    tk::TextKeySelect %W {end - 1 indices}
+}
+
+bind Text <Tab> {
+    if {[%W cget -state] eq "normal"} {
+	tk::TextInsert %W \t
+	focus %W
+	break
+    }
+}
+bind Text <Shift-Tab> {
+    # Needed only to keep <Tab> binding from triggering;  doesn't
+    # have to actually do anything.
+    break
+}
+bind Text <Control-Tab> {
+    focus [tk_focusNext %W]
+}
+bind Text <Control-Shift-Tab> {
+    focus [tk_focusPrev %W]
+}
+bind Text <Control-i> {
+    tk::TextInsert %W \t
+}
+bind Text <Return> {
+    tk::TextInsert %W \n
+    if {[%W cget -autoseparators]} {
+	%W edit separator
+    }
+}
+bind Text <Delete> {
+    if {[tk::TextCursorInSelection %W]} {
+	%W delete sel.first sel.last
+    } else {
+	if {[%W compare end != insert+1c]} {
+	    %W delete insert
+	}
+	%W see insert
+    }
+}
+bind Text <BackSpace> {
+    if {[tk::TextCursorInSelection %W]} {
+	%W delete sel.first sel.last
+    } else {
+	if {[%W compare insert != 1.0]} {
+	    %W delete insert-1c
+	}
+	%W see insert
+    }
+}
+
+bind Text <Control-space> {
+    %W mark set [tk::TextAnchor %W] insert
+}
+bind Text <Select> {
+    %W mark set [tk::TextAnchor %W] insert
+}
+bind Text <Control-Shift-space> {
+    set tk::Priv(selectMode) char
+    tk::TextKeyExtend %W insert
+}
+bind Text <Shift-Select> {
+    set tk::Priv(selectMode) char
+    tk::TextKeyExtend %W insert
+}
+bind Text <<SelectAll>> {
+    %W tag add sel 1.0 end
+}
+bind Text <<SelectNone>> {
+    %W tag remove sel 1.0 end
+    # An operation that clears the selection must insert an autoseparator,
+    # because the selection operation may have moved the insert mark
+    if {[%W cget -autoseparators]} {
+	%W edit separator
+    }
+}
+bind Text <<Cut>> {
+    tk_textCut %W
+}
+bind Text <<Copy>> {
+    tk_textCopy %W
+}
+bind Text <<Paste>> {
+    tk_textPaste %W
+}
+bind Text <<Clear>> {
+    # Make <<Clear>> an atomic operation on the Undo stack,
+    # i.e. separate it from other delete operations on either side
+    if {[%W cget -autoseparators]} {
+	%W edit separator
+    }
+    catch {%W delete sel.first sel.last}
+    if {[%W cget -autoseparators]} {
+	%W edit separator
+    }
+}
+bind Text <<PasteSelection>> {
+    if {$tk_strictMotif || ![info exists tk::Priv(mouseMoved)]
+	    || !$tk::Priv(mouseMoved)} {
+	tk::TextPasteSelection %W %x %y
+    }
+}
+bind Text <Insert> {
+    catch {tk::TextInsert %W [::tk::GetSelection %W PRIMARY]}
+}
+bind Text <KeyPress> {
+    tk::TextInsert %W %A
+}
+
+# Ignore all Alt, Meta, and Control keypresses unless explicitly bound.
+# Otherwise, if a widget binding for one of these is defined, the
+# <KeyPress> class binding will also fire and insert the character,
+# which is wrong.  Ditto for <Escape>.
+
+bind Text <Alt-KeyPress> {# nothing }
+bind Text <Meta-KeyPress> {# nothing}
+bind Text <Control-KeyPress> {# nothing}
+bind Text <Escape> {# nothing}
+bind Text <KP_Enter> {# nothing}
+if {[tk windowingsystem] eq "aqua"} {
+    bind Text <Command-KeyPress> {# nothing}
+}
+
+# Additional emacs-like bindings:
+
+bind Text <Control-d> {
+    if {!$tk_strictMotif && [%W compare end != insert+1c]} {
+	%W delete insert
+    }
+}
+bind Text <Control-k> {
+    if {!$tk_strictMotif && [%W compare end != insert+1c]} {
+	if {[%W compare insert == {insert lineend}]} {
+	    %W delete insert
+	} else {
+	    %W delete insert {insert lineend}
+	}
+    }
+}
+bind Text <Control-o> {
+    if {!$tk_strictMotif} {
+	%W insert insert \n
+	%W mark set insert insert-1c
+    }
+}
+bind Text <Control-t> {
+    if {!$tk_strictMotif} {
+	tk::TextTranspose %W
+    }
+}
+
+bind Text <<Undo>> {
+    # An Undo operation may remove the separator at the top of the Undo stack.
+    # Then the item at the top of the stack gets merged with the subsequent changes.
+    # Place separators before and after Undo to prevent this.
+    if {[%W cget -autoseparators]} {
+	%W edit separator
+    }
+    catch { %W edit undo }
+    if {[%W cget -autoseparators]} {
+	%W edit separator
+    }
+}
+
+bind Text <<Redo>> {
+    catch { %W edit redo }
+}
+
+bind Text <Meta-b> {
+    if {!$tk_strictMotif} {
+	tk::TextSetCursor %W [tk::TextPrevPos %W insert tcl_startOfPreviousWord]
+    }
+}
+bind Text <Meta-d> {
+    if {!$tk_strictMotif && [%W compare end != insert+1c]} {
+	%W delete insert [tk::TextNextWord %W insert]
+    }
+}
+bind Text <Meta-f> {
+    if {!$tk_strictMotif} {
+	tk::TextSetCursor %W [tk::TextNextWord %W insert]
+    }
+}
+bind Text <Meta-less> {
+    if {!$tk_strictMotif} {
+	tk::TextSetCursor %W 1.0
+    }
+}
+bind Text <Meta-greater> {
+    if {!$tk_strictMotif} {
+	tk::TextSetCursor %W end-1c
+    }
+}
+bind Text <Meta-BackSpace> {
+    if {!$tk_strictMotif} {
+	%W delete [tk::TextPrevPos %W insert tcl_startOfPreviousWord] insert
+    }
+}
+bind Text <Meta-Delete> {
+    if {!$tk_strictMotif} {
+	%W delete [tk::TextPrevPos %W insert tcl_startOfPreviousWord] insert
+    }
+}
+
+# Macintosh only bindings:
+
+if {[tk windowingsystem] eq "aqua"} {
+bind Text <Control-v> {
+    tk::TextScrollPages %W 1
+}
+
+# End of Mac only bindings
+}
+
+# A few additional bindings of my own.
+
+bind Text <Control-h> {
+    if {!$tk_strictMotif && [%W compare insert != 1.0]} {
+	%W delete insert-1c
+	%W see insert
+    }
+}
+bind Text <2> {
+    if {!$tk_strictMotif} {
+	tk::TextScanMark %W %x %y
+    }
+}
+bind Text <B2-Motion> {
+    if {!$tk_strictMotif} {
+	tk::TextScanDrag %W %x %y
+    }
+}
+set ::tk::Priv(prevPos) {}
+
+# The MouseWheel will typically only fire on Windows and MacOS X.
+# However, someone could use the "event generate" command to produce one
+# on other platforms.  We must be careful not to round -ve values of %D
+# down to zero.
+
+if {[tk windowingsystem] eq "aqua"} {
+    bind Text <MouseWheel> {
+        %W yview scroll [expr {-15 * (%D)}] pixels
+    }
+    bind Text <Option-MouseWheel> {
+        %W yview scroll [expr {-150 * (%D)}] pixels
+    }
+    bind Text <Shift-MouseWheel> {
+        %W xview scroll [expr {-15 * (%D)}] pixels
+    }
+    bind Text <Shift-Option-MouseWheel> {
+        %W xview scroll [expr {-150 * (%D)}] pixels
+    }
+} else {
+    # We must make sure that positive and negative movements are rounded
+    # equally to integers, avoiding the problem that
+    #     (int)1/3 = 0,
+    # but
+    #     (int)-1/3 = -1
+    # The following code ensure equal +/- behaviour.
+    bind Text <MouseWheel> {
+	if {%D >= 0} {
+	    %W yview scroll [expr {-%D/3}] pixels
+	} else {
+	    %W yview scroll [expr {(2-%D)/3}] pixels
+	}
+    }
+    bind Text <Shift-MouseWheel> {
+	if {%D >= 0} {
+	    %W xview scroll [expr {-%D/3}] pixels
+	} else {
+	    %W xview scroll [expr {(2-%D)/3}] pixels
+	}
+    }
+}
+
+if {"x11" eq [tk windowingsystem]} {
+    # Support for mousewheels on Linux/Unix commonly comes through mapping
+    # the wheel to the extended buttons.  If you have a mousewheel, find
+    # Linux configuration info at:
+    #	http://linuxreviews.org/howtos/xfree/mouse/
+    bind Text <4> {
+	if {!$tk_strictMotif} {
+	    %W yview scroll -50 pixels
+	}
+    }
+    bind Text <5> {
+	if {!$tk_strictMotif} {
+	    %W yview scroll 50 pixels
+	}
+    }
+    bind Text <Shift-4> {
+	if {!$tk_strictMotif} {
+	    %W xview scroll -50 pixels
+	}
+    }
+    bind Text <Shift-5> {
+	if {!$tk_strictMotif} {
+	    %W xview scroll 50 pixels
+	}
+    }
+}
+
+# ::tk::TextClosestGap --
+# Given x and y coordinates, this procedure finds the closest boundary
+# between characters to the given coordinates and returns the index
+# of the character just after the boundary.
+#
+# Arguments:
+# w -		The text window.
+# x -		X-coordinate within the window.
+# y -		Y-coordinate within the window.
+
+proc ::tk::TextClosestGap {w x y} {
+    set pos [$w index @$x,$y]
+    set bbox [$w bbox $pos]
+    if {$bbox eq ""} {
+	return $pos
+    }
+    if {($x - [lindex $bbox 0]) < ([lindex $bbox 2]/2)} {
+	return $pos
+    }
+    $w index "$pos + 1 char"
+}
+
+# ::tk::TextButton1 --
+# This procedure is invoked to handle button-1 presses in text
+# widgets.  It moves the insertion cursor, sets the selection anchor,
+# and claims the input focus.
+#
+# Arguments:
+# w -		The text window in which the button was pressed.
+# x -		The x-coordinate of the button press.
+# y -		The x-coordinate of the button press.
+
+proc ::tk::TextButton1 {w x y} {
+    variable ::tk::Priv
+
+    set Priv(selectMode) char
+    set Priv(mouseMoved) 0
+    set Priv(pressX) $x
+    set anchorname [tk::TextAnchor $w]
+    $w mark set insert [TextClosestGap $w $x $y]
+    $w mark set $anchorname insert
+    # Set the anchor mark's gravity depending on the click position
+    # relative to the gap
+    set bbox [$w bbox [$w index $anchorname]]
+    if {$x > [lindex $bbox 0]} {
+	$w mark gravity $anchorname right
+    } else {
+	$w mark gravity $anchorname left
+    }
+    # Allow focus in any case on Windows, because that will let the
+    # selection be displayed even for state disabled text widgets.
+    if {[tk windowingsystem] eq "win32" \
+	    || [$w cget -state] eq "normal"} {
+	focus $w
+    }
+    if {[$w cget -autoseparators]} {
+	$w edit separator
+    }
+}
+
+# ::tk::TextSelectTo --
+# This procedure is invoked to extend the selection, typically when
+# dragging it with the mouse.  Depending on the selection mode (character,
+# word, line) it selects in different-sized units.  This procedure
+# ignores mouse motions initially until the mouse has moved from
+# one character to another or until there have been multiple clicks.
+#
+# Note that the 'anchor' is implemented programmatically using
+# a text widget mark, and uses a name that will be unique for each
+# text widget (even when there are multiple peers).  Currently the
+# anchor is considered private to Tk, hence the name 'tk::anchor$w'.
+#
+# Arguments:
+# w -		The text window in which the button was pressed.
+# x -		Mouse x position.
+# y - 		Mouse y position.
+
+set ::tk::Priv(textanchoruid) 0
+
+proc ::tk::TextAnchor {w} {
+    variable Priv
+    if {![info exists Priv(textanchor,$w)]} {
+        set Priv(textanchor,$w) tk::anchor[incr Priv(textanchoruid)]
+    }
+    return $Priv(textanchor,$w)
+}
+
+proc ::tk::TextSelectTo {w x y {extend 0}} {
+    variable ::tk::Priv
+
+    set anchorname [tk::TextAnchor $w]
+    set cur [TextClosestGap $w $x $y]
+    if {[catch {$w index $anchorname}]} {
+	$w mark set $anchorname $cur
+    }
+    set anchor [$w index $anchorname]
+    if {[$w compare $cur != $anchor] || (abs($Priv(pressX) - $x) >= 3)} {
+	set Priv(mouseMoved) 1
+    }
+    switch -- $Priv(selectMode) {
+	char {
+	    if {[$w compare $cur < $anchorname]} {
+		set first $cur
+		set last $anchorname
+	    } else {
+		set first $anchorname
+		set last $cur
+	    }
+	}
+	word {
+	    # Set initial range based only on the anchor (1 char min width)
+	    if {[$w mark gravity $anchorname] eq "right"} {
+		set first $anchorname
+		set last "$anchorname + 1c"
+	    } else {
+		set first "$anchorname - 1c"
+		set last $anchorname
+	    }
+	    # Extend range (if necessary) based on the current point
+	    if {[$w compare $cur < $first]} {
+		set first $cur
+	    } elseif {[$w compare $cur > $last]} {
+		set last $cur
+	    }
+
+	    # Now find word boundaries
+	    set first [TextPrevPos $w "$first + 1c" tcl_wordBreakBefore]
+	    set last [TextNextPos $w "$last - 1c" tcl_wordBreakAfter]
+	}
+	line {
+	    # Set initial range based only on the anchor
+	    set first "$anchorname linestart"
+	    set last "$anchorname lineend"
+
+	    # Extend range (if necessary) based on the current point
+	    if {[$w compare $cur < $first]} {
+		set first "$cur linestart"
+	    } elseif {[$w compare $cur > $last]} {
+		set last "$cur lineend"
+	    }
+	    set first [$w index $first]
+	    set last [$w index "$last + 1c"]
+	}
+    }
+    if {$Priv(mouseMoved) || ($Priv(selectMode) ne "char")} {
+	$w tag remove sel 0.0 end
+	$w mark set insert $cur
+	$w tag add sel $first $last
+	$w tag remove sel $last end
+	update idletasks
+    }
+}
+
+# ::tk::TextKeyExtend --
+# This procedure handles extending the selection from the keyboard,
+# where the point to extend to is really the boundary between two
+# characters rather than a particular character.
+#
+# Arguments:
+# w -		The text window.
+# index -	The point to which the selection is to be extended.
+
+proc ::tk::TextKeyExtend {w index} {
+
+    set anchorname [tk::TextAnchor $w]
+    set cur [$w index $index]
+    if {[catch {$w index $anchorname}]} {
+	$w mark set $anchorname $cur
+    }
+    set anchor [$w index $anchorname]
+    if {[$w compare $cur < $anchorname]} {
+	set first $cur
+	set last $anchorname
+    } else {
+	set first $anchorname
+	set last $cur
+    }
+    $w tag remove sel 0.0 $first
+    $w tag add sel $first $last
+    $w tag remove sel $last end
+}
+
+# ::tk::TextPasteSelection --
+# This procedure sets the insertion cursor to the mouse position,
+# inserts the selection, and sets the focus to the window.
+#
+# Arguments:
+# w -		The text window.
+# x, y - 	Position of the mouse.
+
+proc ::tk::TextPasteSelection {w x y} {
+    $w mark set insert [TextClosestGap $w $x $y]
+    if {![catch {::tk::GetSelection $w PRIMARY} sel]} {
+	set oldSeparator [$w cget -autoseparators]
+	if {$oldSeparator} {
+	    $w configure -autoseparators 0
+	    $w edit separator
+	}
+	$w insert insert $sel
+	if {$oldSeparator} {
+	    $w edit separator
+	    $w configure -autoseparators 1
+	}
+    }
+    if {[$w cget -state] eq "normal"} {
+	focus $w
+    }
+}
+
+# ::tk::TextAutoScan --
+# This procedure is invoked when the mouse leaves a text window
+# with button 1 down.  It scrolls the window up, down, left, or right,
+# depending on where the mouse is (this information was saved in
+# ::tk::Priv(x) and ::tk::Priv(y)), and reschedules itself as an "after"
+# command so that the window continues to scroll until the mouse
+# moves back into the window or the mouse button is released.
+#
+# Arguments:
+# w -		The text window.
+
+proc ::tk::TextAutoScan {w} {
+    variable ::tk::Priv
+    if {![winfo exists $w]} {
+	return
+    }
+    if {$Priv(y) >= [winfo height $w]} {
+	$w yview scroll [expr {1 + $Priv(y) - [winfo height $w]}] pixels
+    } elseif {$Priv(y) < 0} {
+	$w yview scroll [expr {-1 + $Priv(y)}] pixels
+    } elseif {$Priv(x) >= [winfo width $w]} {
+	$w xview scroll 2 units
+    } elseif {$Priv(x) < 0} {
+	$w xview scroll -2 units
+    } else {
+	return
+    }
+    TextSelectTo $w $Priv(x) $Priv(y)
+    set Priv(afterId) [after 50 [list tk::TextAutoScan $w]]
+}
+
+# ::tk::TextSetCursor
+# Move the insertion cursor to a given position in a text.  Also
+# clears the selection, if there is one in the text, and makes sure
+# that the insertion cursor is visible.  Also, don't let the insertion
+# cursor appear on the dummy last line of the text.
+#
+# Arguments:
+# w -		The text window.
+# pos -		The desired new position for the cursor in the window.
+
+proc ::tk::TextSetCursor {w pos} {
+    if {[$w compare $pos == end]} {
+	set pos {end - 1 chars}
+    }
+    $w mark set insert $pos
+    $w tag remove sel 1.0 end
+    $w see insert
+    if {[$w cget -autoseparators]} {
+	$w edit separator
+    }
+}
+
+# ::tk::TextKeySelect
+# This procedure is invoked when stroking out selections using the
+# keyboard.  It moves the cursor to a new position, then extends
+# the selection to that position.
+#
+# Arguments:
+# w -		The text window.
+# new -		A new position for the insertion cursor (the cursor hasn't
+#		actually been moved to this position yet).
+
+proc ::tk::TextKeySelect {w new} {
+    set anchorname [tk::TextAnchor $w]
+    if {[$w tag nextrange sel 1.0 end] eq ""} {
+	if {[$w compare $new < insert]} {
+	    $w tag add sel $new insert
+	} else {
+	    $w tag add sel insert $new
+	}
+	$w mark set $anchorname insert
+    } else {
+        if {[catch {$w index $anchorname}]} {
+            $w mark set $anchorname insert
+        }
+	if {[$w compare $new < $anchorname]} {
+	    set first $new
+	    set last $anchorname
+	} else {
+	    set first $anchorname
+	    set last $new
+	}
+	$w tag remove sel 1.0 $first
+	$w tag add sel $first $last
+	$w tag remove sel $last end
+    }
+    $w mark set insert $new
+    $w see insert
+    update idletasks
+}
+
+# ::tk::TextResetAnchor --
+# Set the selection anchor to whichever end is farthest from the
+# index argument.  One special trick: if the selection has two or
+# fewer characters, just leave the anchor where it is.  In this
+# case it doesn't matter which point gets chosen for the anchor,
+# and for the things like Shift-Left and Shift-Right this produces
+# better behavior when the cursor moves back and forth across the
+# anchor.
+#
+# Arguments:
+# w -		The text widget.
+# index -	Position at which mouse button was pressed, which determines
+#		which end of selection should be used as anchor point.
+
+proc ::tk::TextResetAnchor {w index} {
+    if {[$w tag ranges sel] eq ""} {
+	# Don't move the anchor if there is no selection now; this
+	# makes the widget behave "correctly" when the user clicks
+	# once, then shift-clicks somewhere -- ie, the area between
+	# the two clicks will be selected. [Bug: 5929].
+	return
+    }
+    set anchorname [tk::TextAnchor $w]
+    set a [$w index $index]
+    set b [$w index sel.first]
+    set c [$w index sel.last]
+    if {[$w compare $a < $b]} {
+	$w mark set $anchorname sel.last
+	return
+    }
+    if {[$w compare $a > $c]} {
+	$w mark set $anchorname sel.first
+	return
+    }
+    scan $a "%d.%d" lineA chA
+    scan $b "%d.%d" lineB chB
+    scan $c "%d.%d" lineC chC
+    if {$lineB < $lineC+2} {
+	set total [string length [$w get $b $c]]
+	if {$total <= 2} {
+	    return
+	}
+	if {[string length [$w get $b $a]] < ($total/2)} {
+	    $w mark set $anchorname sel.last
+	} else {
+	    $w mark set $anchorname sel.first
+	}
+	return
+    }
+    if {($lineA-$lineB) < ($lineC-$lineA)} {
+	$w mark set $anchorname sel.last
+    } else {
+	$w mark set $anchorname sel.first
+    }
+}
+
+# ::tk::TextCursorInSelection --
+# Check whether the selection exists and contains the insertion cursor. Note
+# that it assumes that the selection is contiguous.
+#
+# Arguments:
+# w -		The text widget whose selection is to be checked
+
+proc ::tk::TextCursorInSelection {w} {
+    expr {
+	[llength [$w tag ranges sel]]
+	&& [$w compare sel.first <= insert]
+	&& [$w compare sel.last >= insert]
+    }
+}
+
+# ::tk::TextInsert --
+# Insert a string into a text at the point of the insertion cursor.
+# If there is a selection in the text, and it covers the point of the
+# insertion cursor, then delete the selection before inserting.
+#
+# Arguments:
+# w -		The text window in which to insert the string
+# s -		The string to insert (usually just a single character)
+
+proc ::tk::TextInsert {w s} {
+    if {$s eq "" || [$w cget -state] eq "disabled"} {
+	return
+    }
+    set compound 0
+    if {[TextCursorInSelection $w]} {
+	set oldSeparator [$w cget -autoseparators]
+	if {$oldSeparator} {
+	    $w configure -autoseparators 0
+	    $w edit separator
+	    set compound 1
+	}
+	$w delete sel.first sel.last
+    }
+    $w insert insert $s
+    $w see insert
+    if {$compound && $oldSeparator} {
+	$w edit separator
+	$w configure -autoseparators 1
+    }
+}
+
+# ::tk::TextUpDownLine --
+# Returns the index of the character one display line above or below the
+# insertion cursor.  There are two tricky things here.  First, we want to
+# maintain the original x position across repeated operations, even though
+# some lines that will get passed through don't have enough characters to
+# cover the original column.  Second, don't try to scroll past the
+# beginning or end of the text.
+#
+# Arguments:
+# w -		The text window in which the cursor is to move.
+# n -		The number of display lines to move: -1 for up one line,
+#		+1 for down one line.
+
+proc ::tk::TextUpDownLine {w n} {
+    variable ::tk::Priv
+
+    set i [$w index insert]
+    if {$Priv(prevPos) ne $i} {
+	set Priv(textPosOrig) $i
+    }
+    set lines [$w count -displaylines $Priv(textPosOrig) $i]
+    set new [$w index \
+	    "$Priv(textPosOrig) + [expr {$lines + $n}] displaylines"]
+    if {[$w compare $new == end] \
+	    || [$w compare $new == "insert display linestart"]} {
+	set new $i
+    }
+    set Priv(prevPos) $new
+    return $new
+}
+
+# ::tk::TextPrevPara --
+# Returns the index of the beginning of the paragraph just before a given
+# position in the text (the beginning of a paragraph is the first non-blank
+# character after a blank line).
+#
+# Arguments:
+# w -		The text window in which the cursor is to move.
+# pos -		Position at which to start search.
+
+proc ::tk::TextPrevPara {w pos} {
+    set pos [$w index "$pos linestart"]
+    while {1} {
+	if {([$w get "$pos - 1 line"] eq "\n" && ([$w get $pos] ne "\n")) \
+		|| $pos eq "1.0"} {
+	    if {[regexp -indices -- {^[ \t]+(.)} \
+		    [$w get $pos "$pos lineend"] -> index]} {
+		set pos [$w index "$pos + [lindex $index 0] chars"]
+	    }
+	    if {[$w compare $pos != insert] || [lindex [split $pos .] 0]==1} {
+		return $pos
+	    }
+	}
+	set pos [$w index "$pos - 1 line"]
+    }
+}
+
+# ::tk::TextNextPara --
+# Returns the index of the beginning of the paragraph just after a given
+# position in the text (the beginning of a paragraph is the first non-blank
+# character after a blank line).
+#
+# Arguments:
+# w -		The text window in which the cursor is to move.
+# start -	Position at which to start search.
+
+proc ::tk::TextNextPara {w start} {
+    set pos [$w index "$start linestart + 1 line"]
+    while {[$w get $pos] ne "\n"} {
+	if {[$w compare $pos == end]} {
+	    return [$w index "end - 1c"]
+	}
+	set pos [$w index "$pos + 1 line"]
+    }
+    while {[$w get $pos] eq "\n"} {
+	set pos [$w index "$pos + 1 line"]
+	if {[$w compare $pos == end]} {
+	    return [$w index "end - 1c"]
+	}
+    }
+    if {[regexp -indices -- {^[ \t]+(.)} \
+	    [$w get $pos "$pos lineend"] -> index]} {
+	return [$w index "$pos + [lindex $index 0] chars"]
+    }
+    return $pos
+}
+
+# ::tk::TextScrollPages --
+# This is a utility procedure used in bindings for moving up and down
+# pages and possibly extending the selection along the way.  It scrolls
+# the view in the widget by the number of pages, and it returns the
+# index of the character that is at the same position in the new view
+# as the insertion cursor used to be in the old view.
+#
+# Arguments:
+# w -		The text window in which the cursor is to move.
+# count -	Number of pages forward to scroll;  may be negative
+#		to scroll backwards.
+
+proc ::tk::TextScrollPages {w count} {
+    set bbox [$w bbox insert]
+    $w yview scroll $count pages
+    if {$bbox eq ""} {
+	return [$w index @[expr {[winfo height $w]/2}],0]
+    }
+    return [$w index @[lindex $bbox 0],[lindex $bbox 1]]
+}
+
+# ::tk::TextTranspose --
+# This procedure implements the "transpose" function for text widgets.
+# It tranposes the characters on either side of the insertion cursor,
+# unless the cursor is at the end of the line.  In this case it
+# transposes the two characters to the left of the cursor.  In either
+# case, the cursor ends up to the right of the transposed characters.
+#
+# Arguments:
+# w -		Text window in which to transpose.
+
+proc ::tk::TextTranspose w {
+    set pos insert
+    if {[$w compare $pos != "$pos lineend"]} {
+	set pos [$w index "$pos + 1 char"]
+    }
+    set new [$w get "$pos - 1 char"][$w get  "$pos - 2 char"]
+    if {[$w compare "$pos - 1 char" == 1.0]} {
+	return
+    }
+    # ensure this is seen as an atomic op to undo
+    set autosep [$w cget -autoseparators]
+    if {$autosep} {
+	$w configure -autoseparators 0
+	$w edit separator
+    }
+    $w delete "$pos - 2 char" $pos
+    $w insert insert $new
+    $w see insert
+    if {$autosep} {
+	$w edit separator
+	$w configure -autoseparators $autosep
+    }
+}
+
+# ::tk_textCopy --
+# This procedure copies the selection from a text widget into the
+# clipboard.
+#
+# Arguments:
+# w -		Name of a text widget.
+
+proc ::tk_textCopy w {
+    if {![catch {set data [$w get sel.first sel.last]}]} {
+	clipboard clear -displayof $w
+	clipboard append -displayof $w $data
+    }
+}
+
+# ::tk_textCut --
+# This procedure copies the selection from a text widget into the
+# clipboard, then deletes the selection (if it exists in the given
+# widget).
+#
+# Arguments:
+# w -		Name of a text widget.
+
+proc ::tk_textCut w {
+    if {![catch {set data [$w get sel.first sel.last]}]} {
+        # make <<Cut>> an atomic operation on the Undo stack,
+        # i.e. separate it from other delete operations on either side
+	set oldSeparator [$w cget -autoseparators]
+	if {([$w cget -state] eq "normal") && $oldSeparator} {
+	    $w edit separator
+	}
+	clipboard clear -displayof $w
+	clipboard append -displayof $w $data
+	$w delete sel.first sel.last
+	if {([$w cget -state] eq "normal") && $oldSeparator} {
+	    $w edit separator
+	}
+    }
+}
+
+# ::tk_textPaste --
+# This procedure pastes the contents of the clipboard to the insertion
+# point in a text widget.
+#
+# Arguments:
+# w -		Name of a text widget.
+
+proc ::tk_textPaste w {
+    if {![catch {::tk::GetSelection $w CLIPBOARD} sel]} {
+	set oldSeparator [$w cget -autoseparators]
+	if {$oldSeparator} {
+	    $w configure -autoseparators 0
+	    $w edit separator
+	}
+	if {[tk windowingsystem] ne "x11"} {
+	    catch { $w delete sel.first sel.last }
+	}
+	$w insert insert $sel
+	if {$oldSeparator} {
+	    $w edit separator
+	    $w configure -autoseparators 1
+	}
+    }
+}
+
+# ::tk::TextNextWord --
+# Returns the index of the next word position after a given position in the
+# text.  The next word is platform dependent and may be either the next
+# end-of-word position or the next start-of-word position after the next
+# end-of-word position.
+#
+# Arguments:
+# w -		The text window in which the cursor is to move.
+# start -	Position at which to start search.
+
+if {[tk windowingsystem] eq "win32"}  {
+    proc ::tk::TextNextWord {w start} {
+	TextNextPos $w [TextNextPos $w $start tcl_endOfWord] \
+		tcl_startOfNextWord
+    }
+} else {
+    proc ::tk::TextNextWord {w start} {
+	TextNextPos $w $start tcl_endOfWord
+    }
+}
+
+# ::tk::TextNextPos --
+# Returns the index of the next position after the given starting
+# position in the text as computed by a specified function.
+#
+# Arguments:
+# w -		The text window in which the cursor is to move.
+# start -	Position at which to start search.
+# op -		Function to use to find next position.
+
+proc ::tk::TextNextPos {w start op} {
+    set text ""
+    set cur $start
+    while {[$w compare $cur < end]} {
+	set text $text[$w get -displaychars $cur "$cur lineend + 1c"]
+	set pos [$op $text 0]
+	if {$pos >= 0} {
+	    return [$w index "$start + $pos display chars"]
+	}
+	set cur [$w index "$cur lineend +1c"]
+    }
+    return end
+}
+
+# ::tk::TextPrevPos --
+# Returns the index of the previous position before the given starting
+# position in the text as computed by a specified function.
+#
+# Arguments:
+# w -		The text window in which the cursor is to move.
+# start -	Position at which to start search.
+# op -		Function to use to find next position.
+
+proc ::tk::TextPrevPos {w start op} {
+    set text ""
+    set cur $start
+    while {[$w compare $cur > 0.0]} {
+	set text [$w get -displaychars "$cur linestart - 1c" $cur]$text
+	set pos [$op $text end]
+	if {$pos >= 0} {
+	    return [$w index "$cur linestart - 1c + $pos display chars"]
+	}
+	set cur [$w index "$cur linestart - 1c"]
+    }
+    return 0.0
+}
+
+# ::tk::TextScanMark --
+#
+# Marks the start of a possible scan drag operation
+#
+# Arguments:
+# w -	The text window from which the text to get
+# x -	x location on screen
+# y -	y location on screen
+
+proc ::tk::TextScanMark {w x y} {
+    variable ::tk::Priv
+    $w scan mark $x $y
+    set Priv(x) $x
+    set Priv(y) $y
+    set Priv(mouseMoved) 0
+}
+
+# ::tk::TextScanDrag --
+#
+# Marks the start of a possible scan drag operation
+#
+# Arguments:
+# w -	The text window from which the text to get
+# x -	x location on screen
+# y -	y location on screen
+
+proc ::tk::TextScanDrag {w x y} {
+    variable ::tk::Priv
+    # Make sure these exist, as some weird situations can trigger the
+    # motion binding without the initial press.  [Bug #220269]
+    if {![info exists Priv(x)]} {
+	set Priv(x) $x
+    }
+    if {![info exists Priv(y)]} {
+	set Priv(y) $y
+    }
+    if {($x != $Priv(x)) || ($y != $Priv(y))} {
+	set Priv(mouseMoved) 1
+    }
+    if {[info exists Priv(mouseMoved)] && $Priv(mouseMoved)} {
+	$w scan dragto $x $y
+    }
+}