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Add missing check in gdk_x11_device_manager_xi2_get_window(), returning NULL if no valid XI2Event* has been found. Calling code seems to be prepared to handle NULLs coming from this function, so it should be safe enough (e.g. check gdk_event_source_get_filter_window()). https://bugzilla.gnome.org/show_bug.cgi?id=700465
201410de