[AC21.5R21.4] Fix crash when using window manager to delete dialog

[Stephen J. Turnbull]

APPROVE COMMIT 21.5 RECOMMEND 21.4

Applies to 21.4 HEAD with offset -2.

Per recent discussion on XEmacs Beta.

chibi:git-integration steve$ cvs diff lwlib
Index: lwlib/ChangeLog
===================================================================
RCS file: /pack/xemacscvs/XEmacs/xemacs/lwlib/ChangeLog,v
retrieving revision 1.90
diff -u -r1.90 ChangeLog
--- lwlib/ChangeLog	17 Nov 2006 02:50:22 -0000	1.90
+++ lwlib/ChangeLog	17 May 2007 14:55:02 -0000
@@ -0,0 +1,5 @@
+2007-05-17  Stephen J. Turnbull  <stephen at xemacs.org>
+
+	* lwlib-Xaw.c (wm_delete_window): Iterate over children of shell
+	(there may be more than one) to find our widget.
+

Index: lwlib/lwlib-Xaw.c
===================================================================
RCS file: /pack/xemacscvs/XEmacs/xemacs/lwlib/lwlib-Xaw.c,v
retrieving revision 1.13
diff -u -r1.13 lwlib-Xaw.c
--- lwlib/lwlib-Xaw.c	2 May 2006 15:30:32 -0000	1.13
+++ lwlib/lwlib-Xaw.c	17 May 2007 14:55:02 -0000
@@ -599,11 +599,14 @@
     abort ();
   XtSetArg (al [0], XtNchildren, &kids);
   XtGetValues (shell, al, 1);
-  if (!kids || !*kids)
-    abort ();
-  widget = kids [0];
-  if (! XtIsSubclass (widget, dialogWidgetClass))
-    abort ();
+  if (!kids || !*kids) abort ();
+
+  for (widget = *kids;
+       widget && ! XtIsSubclass (widget, dialogWidgetClass);
+       widget = *++kids)
+    ;
+  if (!widget) abort ();
+
   id = lw_get_widget_id (widget);
   if (! id) abort ();