Description of problem:

Usually, an alt-rightclick inside a window brings up a window management context menu, the "Minimize / Maximize / Move to another desktop / etc." menu.

Under the current version of metacity, using this combination causes the window manager to crash and restart.

Version-Release number of selected component (if applicable):

metacity-2.30.0-1.fc13.x86_64

How reproducible:

100%

Steps to Reproduce:
1. Alt-rightclick in any window.
2. Crash.
  
Actual results:

(gdb) cont

Program received signal SIGABRT, Aborted.
0x0000003caf033955 in raise (sig=<value optimized out>)
    at ../nptl/sysdeps/unix/sysv/linux/raise.c:64
64	  return INLINE_SYSCALL (tgkill, 3, pid, selftid, sig);
(gdb) info thr
* 1 Thread 0x7f83fe962920 (LWP 29153)  0x0000003caf033955 in raise (
    sig=<value optimized out>) at ../nptl/sysdeps/unix/sysv/linux/raise.c:64
(gdb) bt
#0  0x0000003caf033955 in raise (sig=<value optimized out>)
    at ../nptl/sysdeps/unix/sysv/linux/raise.c:64
#1  0x0000003caf035135 in abort () at abort.c:92
#2  0x0000003cb0861ea4 in g_assertion_message () from /lib64/libglib-2.0.so.0
#3  0x000000000042ead4 in gdk_rectangle_intersect ()
#4  0x000000000044e0d6 in gdk_rectangle_intersect ()
#5  0x000000000044e615 in gdk_rectangle_intersect ()
#6  0x000000000043d663 in gdk_rectangle_intersect ()
#7  0x00000000004201cf in gdk_rectangle_intersect ()
#8  0x00000000004629f6 in gdk_rectangle_intersect ()
#9  0x0000003cb805dce6 in ?? () from /usr/lib64/libgdk-x11-2.0.so.0
#10 0x0000003cb805fdd8 in ?? () from /usr/lib64/libgdk-x11-2.0.so.0
#11 0x0000003cb806030e in ?? () from /usr/lib64/libgdk-x11-2.0.so.0
#12 0x0000003cb083bd02 in g_main_context_dispatch ()
   from /lib64/libglib-2.0.so.0
#13 0x0000003cb083fae8 in ?? () from /lib64/libglib-2.0.so.0
#14 0x0000003cb083fff5 in g_main_loop_run () from /lib64/libglib-2.0.so.0
#15 0x000000000042c27d in gdk_rectangle_intersect ()
#16 0x0000003caf01ed2d in __libc_start_main (main=<value optimized out>, 
    argc=<value optimized out>, ubp_av=<value optimized out>, 
    init=<value optimized out>, fini=<value optimized out>, 
    rtld_fini=<value optimized out>, stack_end=0x7fff32260e18)
    at libc-start.c:226
#17 0x000000000040f409 in gdk_rectangle_intersect ()
#18 0x00007fff32260e18 in ?? ()
#19 0x000000000000001c in ?? ()
#20 0x0000000000000001 in ?? ()
#21 0x00007fff322627d7 in ?? ()
#22 0x0000000000000000 in ?? ()