* library/bgerror.tcl: Added check for withdrawn state of . and

unsetting of transient bit for .bgerrorDialog if . is not
viewable; this protects against the application hanging on systems
like Windows, where transient windows are withdrawn with their
parents. [Bug: 4370].

1 files changed, 16 insertions, 1 deletions

diff --git a/library/bgerror.tcl b/library/bgerror.tcl
index 5f799c9..15f9448 100644
--- a/library/bgerror.tcl
+++ b/library/bgerror.tcl
@@ -4,7 +4,7 @@
 # posts a dialog box with the error message and gives the user a chance
 # to see a more detailed stack trace.
 #
-# RCS: @(#) $Id: bgerror.tcl,v 1.5 1999/04/16 01:51:25 stanton Exp $
+# RCS: @(#) $Id: bgerror.tcl,v 1.6 2000/04/10 23:19:58 ericm Exp $
 #
 # Copyright (c) 1992-1994 The Regents of the University of California.
 # Copyright (c) 1994-1996 Sun Microsystems, Inc.
@@ -23,6 +23,21 @@
 
 proc bgerror err {
     global errorInfo tcl_platform
+    
+    # Normally, the bgerror dialog is made transient with respect to "." (due
+    # to the implementation of tk_dialog).  On some systems (like Windows),
+    # when a window is withdraw or iconified, it's transient windows go with
+    # it.  Unfortunately, there is also a grab on the dialog (again because of
+    # the implementation of tk_dialog).  So if "." is withdrawn or iconified
+    # and the user gets a bgerror, the app will hang, for no apparent reason.
+    #
+    # One (somewhat hacky) way to address this is to un-transient the dialog 
+    # if "." is withdrawn or iconified.
+    after idle {
+	if { ![winfo viewable .bgerrorDialog] } {
+	    wm transient .bgerrorDialog {}
+	}
+    }
 
     # save errorInfo which would be erased in the catch below otherwise.
     set info $errorInfo ;