GWeakRef can point to disposed object if g_object_run_dispose() is used

See #2265 (closed)

GTK likes to do that as part of gtk_widget_destroy() / gtk_container_destroy(), which then disposes all the child objects while there might still be other references to them and especially GWeakRefs.

Retrieving these objects from GWeakRef will then give a zombie object that might misbehave in various ways and is certainly not safe to use for anything.

GWeakRefs are cleared as part of g_object_unref(). Maybe that code can be safely copied to g_object_run_dispose(), maybe not. That needs some investigation.