SigSev using Xim input mode, in gtk 3.16.7


I am experiencing a bug (from synapse package), from which with my low skills, I finally manage to get more info:

Program received signal SIGSEGV, Segmentation fault.
0x00007ffff64407d2 in _gdk_window_has_impl (window=window entry=0x0) at /build/gtk+3.0-pIzeMy/gtk+3.0-3.16.7/./gdk/gdkwindow.c:593
593    /build/gtk+3.0-pIzeMy/gtk+3.0-3.16.7/./gdk/gdkwindow.c: Aucun fichier ou dossier de ce type.
#0  0x00007ffff64407d2 in _gdk_window_has_impl (window=window entry=0x0) at /build/gtk+3.0-pIzeMy/gtk+3.0-3.16.7/./gdk/gdkwindow.c:593
#1  0x00007ffff647179e in gdk_x11_window_get_xid (window=0x0) at /build/gtk+3.0-pIzeMy/gtk+3.0-3.16.7/./gdk/x11/gdkwindow-x11.c:5527
#2  0x00007fffd7bc1fb7 in gtk_im_context_xim_filter_keypress (context=0x79f180, event=0x12b50a0)
    at /build/gtk+3.0-pIzeMy/gtk+3.0-3.16.7/./modules/input/gtkimcontextxim.c:673
#3  0x00007ffff68c3043 in gtk_im_multicontext_filter_keypress (context=0xa1acd0, event=0x12b50a0)
    at /build/gtk+3.0-pIzeMy/gtk+3.0-3.16.7/./gtk/gtkimmulticontext.c:359
#4  0x000000000041b0ea in synapse_gui_controller_real_key_press_event (base=0xa0ccc0, event=0x12b50a0)
    at /home/kwaadpepper/wprojects/synapse-firefox-plugin/src/ui/controller.vala:84
---Type <return> to continue, or q <return> to quit---%

This is occurring in Kubuntu for info, but using xim input mode in general.

I got this using
gdb -ex run -ex bt synapse

It works fine using GTK_IM_MODULE='' synapse, so meaning using cedilla, or fcitx for which I tested ok.
I really think it is a gtk bug, that is why i prefer to ask here before maybe filling a bug, i don't know if this is a known bug, and i think it is not related to synapse itself.

Thanks for your consideration.

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