pretest crashes on vm-visit-folder

[robert marshall]

I'm using the mail reader vm (version 7.19), start up emacs -Q, add
the vm directory to the load path M-x vm-visit-folder and selected a
mail folder and then used v (bound to vm-visit-folder) to visit
another folder and I get the following crash (22.0.90 didn't have this problem)

gdb emacs 
GNU gdb 6.3-5mdk (Mandriva Linux release 2006.0)
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This GDB was configured as "i586-mandriva-linux-gnu"...Using host libthread_db 
library "/lib/tls/libthread_db.so.1".

DISPLAY = :0.0
TERM = dumb
Breakpoint 1 at 0x80ef945: file emacs.c, line 464.
Breakpoint 2 at 0x8107f99: file sysdep.c, line 1383.
(gdb) run -Q
Starting program: /develop/emacs-prerelease/emacs-22.0.91/src/emacs -Q
Reading symbols from shared object read from target memory...done.
Loaded system supplied DSO at 0xffffe000
[Thread debugging using libthread_db enabled]
[New Thread -1218828608 (LWP 15892)]
[Switching to Thread -1218828608 (LWP 15892)]
Breakpoint 3 at 0x80cd4fc: file xterm.c, line 7827.
Detaching after fork from child process 15911.

Program received signal SIGSEGV, Segmentation fault.
0x080eed0a in update_frame_tool_bar (f=0x88697b0) at gtkutil.c:3799
3799              GtkImage *wimage = GTK_IMAGE (chlist->data);
(gdb) xbacktrace
"read-file-name" (0x8a02b9b)
"byte-code" (0x8855823)
"vm-keyboard-read-file-name" (0x8a02b9b)
"vm-read-file-name" (0x8a02b9b)
"list" (0x8382625)
"let" (0x83814fd)
"save-excursion" (0x838a24d)
"call-interactively" (0x87909d1)
(gdb) bt full
#0  0x080eed0a in update_frame_tool_bar (f=0x88697b0) at gtkutil.c:3799
        wvbox = Variable "wvbox" is not available.

Lisp Backtrace:
"read-file-name" (0x8a02b9b)
"byte-code" (0x8855823)
"vm-keyboard-read-file-name" (0x8a02b9b)
"vm-read-file-name" (0x8a02b9b)
"list" (0x8382625)
"let" (0x83814fd)
"save-excursion" (0x838a24d)
"call-interactively" (0x87909d1)

In GNU Emacs 22.0.91.1 (i686-pc-linux-gnu, GTK+ Version 2.8.3)
 of 2006-12-01 on faure.chezmarshall.freeserve.co.uk
X server distributor `Mandriva Linux (X.Org X11 6.9.0, patch level 
5.10.20060mdk)', version 11.0.60900000
configured using `configure '--with-x-toolkit=gtk''

Important settings:
  value of $LC_ALL: nil
  value of $LC_COLLATE: en_GB
  value of $LC_CTYPE: en_GB
  value of $LC_MESSAGES: en_GB
  value of $LC_MONETARY: en_GB
  value of $LC_NUMERIC: en_GB
  value of $LC_TIME: en_GB
  value of $LANG: en_GB
  locale-coding-system: iso-8859-1
  default-enable-multibyte-characters: t