Comment 11 for bug 438463

Alright, seeing as how I couldn't get a backtrace on gdk_x_error I've done as best I can and instead put a break in at the GDK Warning immediately before hand. If I step through from this point the BadWindow error is raised as soon as gdk_x11_drawable_get_xid return. Backtrace:

Breakpoint 2, IA__gdk_x11_drawable_get_xid (drawable=0x0)
    at /tmp/buildd/gtk+2.0-2.18.2/gdk/x11/gdkdrawable-x11.c:952
952 /tmp/buildd/gtk+2.0-2.18.2/gdk/x11/gdkdrawable-x11.c: No such file or directory.
 in /tmp/buildd/gtk+2.0-2.18.2/gdk/x11/gdkdrawable-x11.c
(gdb) bt
#0 IA__gdk_x11_drawable_get_xid (drawable=0x0)
    at /tmp/buildd/gtk+2.0-2.18.2/gdk/x11/gdkdrawable-x11.c:952
#1 0x00007fffe83f4b15 in window_is_xembed () at canberra-gtk-module.c:371
#2 dispatch_sound_event () at canberra-gtk-module.c:436
#3 dispatch_queue () at canberra-gtk-module.c:794
#4 0x00007fffe83f51d3 in idle_cb (userdata=0x0) at canberra-gtk-module.c:802
#5 0x00007ffff495a847 in gdk_threads_dispatch (data=0x81f100)
    at /tmp/buildd/gtk+2.0-2.18.2/gdk/gdk.c:506
#6 0x00007ffff1e7512a in g_main_context_dispatch () from /lib/libglib-2.0.so.0
#7 0x00007ffff1e78988 in ?? () from /lib/libglib-2.0.so.0
#8 0x00007ffff1e78e5d in g_main_loop_run () from /lib/libglib-2.0.so.0
#9 0x00007ffff4d24c07 in IA__gtk_main ()
    at /tmp/buildd/gtk+2.0-2.18.2/gtk/gtkmain.c:1216
#10 0x0000000000432ca4 in main (argc=1, argv=0x7fffffffe918) at ephy-main.c:782

Could be insufficient checking in libcanberra?