bug#10361: 24.0.92; mode-line major mode menu is one pixel high under gtk3

[dkh <dustin.hemmerling@gmail.com>]

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Please describe exactly what actions triggered the bug, and
the precise symptoms of the bug.  If you can, give a recipe
starting from `emacs -Q':



If Emacs crashed, and you have the Emacs process in the gdb debugger,
please include the output from the following gdb commands:
    `bt full' and `xbacktrace'.
For information about debugging Emacs, please read the file
/usr/share/emacs/24.0.92/etc/DEBUG.


In GNU Emacs 24.0.92.1 (i486-pc-linux-gnu, GTK+ Version 3.2.2)
 of 2011-12-19 on zelenka, modified by Debian
 (emacs-snapshot package, version 1:20111219-1)
Windowing system distributor `The X.Org Foundation', version 11.0.11102902
configured using `configure  '--build' 'i486-linux-gnu' '--host' 'i486-linux-gnu' '--prefix=/usr' '--sharedstatedir=/var/lib' '--libexecdir=/usr/lib' '--localstatedir=/var' '--infodir=/usr/share/info' '--mandir=/usr/share/man' '--with-pop=yes' '--enable-locallisppath=/etc/emacs-snapshot:/etc/emacs:/usr/local/share/emacs/24.0.92/site-lisp:/usr/local/share/emacs/site-lisp:/usr/share/emacs/24.0.92/site-lisp:/usr/share/emacs/site-lisp' '--without-compress-info' '--with-crt-dir=/usr/lib/i386-linux-gnu/' '--with-x=yes' '--with-x-toolkit=gtk3' '--with-imagemagick=yes' 'build_alias=i486-linux-gnu' 'host_alias=i486-linux-gnu' 'CFLAGS=-DDEBIAN -DSITELOAD_PURESIZE_EXTRA=5000 -g -O2''

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_CA.UTF-8
  value of $XMODIFIERS: nil
  locale-coding-system: utf-8-unix
  default enable-multibyte-characters: t

Major mode: Fundamental

Minor modes in effect:
  display-time-mode: t
  display-battery-mode: t
  tooltip-mode: t
  mouse-wheel-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  blink-cursor-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  column-number-mode: t
  line-number-mode: t
  global-visual-line-mode: t
  transient-mark-mode: t

Recent input:
<help-echo> <down-mouse-1> M-x e <backspace> r e p 
o SPC r SPC e m SPC a <backspace> b SPC <return>

Recent messages:
Loading /etc/emacs/site-start.d/50bbdb.el (source)...done
Loading /etc/emacs/site-start.d/50dictionaries-common.el (source)...
Skipping dictionaries-common setup for emacs-snapshot
Loading /etc/emacs/site-start.d/50dictionaries-common.el (source)...done
Loading /etc/emacs/site-start.d/50flim.el (source)...done
Loading /etc/emacs/site-start.d/50w3m-el.el (source)...done
Loading /etc/emacs/site-start.d/50w3m-el-snapshot.el (source)...done
OVERVIEW
For information about GNU Emacs and the GNU system, type C-? C-a.
Making completion list...

Load-path shadows:

When I click on the major mode name in the mode-line, the selection menu
drops downward.  Since I am using the tiling wm stumpwm, the emacs frame
takes up the entire screen, so the selection menu is squashed and the
text-display in the selection menu is one pixel high.  I had similar
results in wmaker, but since I can move the emacs frame up a bit from
the bottom of the screen I can see more of the selection menu.  This
does not occur if I click on a minor mode name.  I experience this if
installing Emacs 24 from an unofficial Debian package, and when built
from bazaar on Arch Linux.  This does not occur if I build with gtk2
support.
-- 
take care and control,
dkh