bug#4122: 23.1; GTK menu contents don't change

[Robin Green]

After opening a file, the contents of the Buffer menu do not change - the menu 
still begins with *scratch* and *messages*. However, if you actually click with 
the mouse on the *messages* menu item, you do NOT get sent to the *messages* 
buffer - you get sent to some other buffer. Likewise, in a new major mode, each 
menu displays either the old contents of the menu that was in that position in 
the menubar in the previous major mode, or nothing (an empty menu). Likewise, 
if you select some text with the mouse, the "Cut" and "Copy" items in the Edit 
menu do not become enabled, as they should.

All of this evidence suggests that, after the original menubar is created, new 
menus can be added or removed, but any alterations to menus do not take effect 
on the display. However, as shown by the example of clicking on the *messages* 
menu item in the Buffers menu, emacs appears to be reacting AS IF the altered 
version of the menu was being displayed, even though it isn't.

I am running on Fedora Linux rawhide (i.e. the development version, 
pre-Fedora-12), with the following gtk2 package:
gtk2-2.17.6-4.fc12.i686


In GNU Emacs 23.1.1 (i686-pc-linux-gnu, GTK+ Version 2.17.6)
 of 2009-08-11 on fedora
Windowing system distributor `The X.Org Foundation', version 11.0.10402000
configured using `configure  '--with-x-toolkit=gtk' '--without-makeinfo' 
'--with-x''

Important settings:
  value of $LC_ALL: nil
  value of $LC_COLLATE: nil
  value of $LC_CTYPE: nil
  value of $LC_MESSAGES: nil
  value of $LC_MONETARY: nil
  value of $LC_NUMERIC: nil
  value of $LC_TIME: nil
  value of $LANG: en_US.UTF-8
  value of $XMODIFIERS: nil
  locale-coding-system: utf-8-unix
  default-enable-multibyte-characters: t

Major mode: Fundamental

Minor modes in effect:
  tooltip-mode: t
  tool-bar-mode: t
  mouse-wheel-mode: t
  menu-bar-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  blink-cursor-mode: t
  global-auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  line-number-mode: t
  transient-mark-mode: t

Recent input:
<help-echo> <help-echo> <help-echo> C-x C-f <backspace> 
<backspace> <backspace> <backspace> <backspace> <backspace> 
<backspace> <backspace> <backspace> <backspace> <backspace> 
<backspace> <backspace> <backspace> <backspace> <backspace> 
<backspace> <backspace> m i <tab> <return> <help-echo> 
<help-echo> <help-echo> <help-echo> <help-echo> <help-echo> 
<help-echo> <help-echo> <help-echo> <help-echo> <help-echo> 
<help-echo> <help-echo> <help-echo> <help-echo> <help-echo> 
<help-echo> <menu-bar> <help-menu> <about-emacs> <help-echo> 
<help-echo> <help-echo> <help-echo> <help-echo> <help-echo> 
<help-echo> <help-echo> <help-echo> <menu-bar> <help-menu> 
<send-emacs-bug-report>

Recent messages:
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For information about GNU Emacs and the GNU system, type C-h C-a.