Comment 7 for bug 474954

Backtrace with Inkscape revision 10523, Ubuntu 10.10 (with breakpoint on _XError):

--
Breakpoint 1, 0x0109b536 in _XError () from /usr/lib/libX11.so.6
(gdb) bt
#0 0x0109b536 in _XError () from /usr/lib/libX11.so.6
#1 0x0109815a in ?? () from /usr/lib/libX11.so.6
#2 0x0109889c in _XReply () from /usr/lib/libX11.so.6
#3 0x0221702b in XGrabDevice () from /usr/lib/libXi.so.6
#4 0x0199d749 in _gdk_input_grab_pointer (window=0xa5e5230, native_window=0x8aaba28, owner_events=0, event_mask=2110212,
    confine_to=0x0, time=64203805) at /build/buildd/gtk+2.0-2.22.0/gdk/x11/gdkinput-xfree.c:353
#5 0x0198b68b in _gdk_windowing_pointer_grab (window=0xa5e5230, native=0x8aaba28, owner_events=0, event_mask=2110212, confine_to=
    0x0, cursor=0x0, time=64203805) at /build/buildd/gtk+2.0-2.22.0/gdk/x11/gdkmain-x11.c:201
#6 0x0196acc9 in IA__gdk_pointer_grab (window=0xa5e5230, owner_events=0, event_mask=772, confine_to=0x0, cursor=0x0,
    time=64203805) at /build/buildd/gtk+2.0-2.22.0/gdk/gdkwindow.c:10329
#7 0x081dc6fa in sp_canvas_item_grab (item=0x9d6c920, event_mask=3844, cursor=0x0, etime=64203805) at display/sp-canvas.cpp:556
#8 0x085b2f3a in sp_select_context_root_handler (event_context=0x9d6a238, event=0xa612f78) at select-context.cpp:509
#9 0x0808fb97 in sp_event_context_virtual_root_handler (event_context=0x9d6a238, event=0xa612f78) at event-context.cpp:965
#10 0x0854a5c7 in sp_desktop_root_handler (event=0xa612f78, desktop=0x904adb0) at desktop-events.cpp:71
#11 0x0825d8a8 in sp_marshal_BOOLEAN__POINTER (closure=0x9dd6328, return_value=0xbfffeb6c, n_param_values=2, param_values=
    0xa5c6ef0, invocation_hint=0xbfffea00, marshal_data=0x854a590) at helper/sp-marshal.cpp:122
#12 0x01cba412 in g_closure_invoke (closure=0x9dd6328, return_value=0xbfffeb6c, n_param_values=2, param_values=0xa5c6ef0,
    invocation_hint=0xbfffea00) at /build/buildd/glib2.0-2.26.1/gobject/gclosure.c:766
#13 0x01cd0b85 in signal_emit_unlocked_R (node=<value optimised out>, detail=<value optimised out>, instance=0x9d6c920,
    emission_return=0xbfffeb6c, instance_and_params=0xa5c6ef0) at /build/buildd/glib2.0-2.26.1/gobject/gsignal.c:3252
#14 0x01cd1e2b in g_signal_emit_valist (instance=0x9d6c920, signal_id=197, detail=0, var_args=0xbfffebd0 "\004\354\377\277蒩\b)")
    at /build/buildd/glib2.0-2.26.1/gobject/gsignal.c:2993
#15 0x01cd2452 in g_signal_emit (instance=0x9d6c920, signal_id=197, detail=0)