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In _clutter_actor_queue_redraw_with_clip, there was the possibility that the actor will add itself to the stage's redraw queue without keeping track of the allocated list member. In clutter_actor_unparent, the redraw queue entry was being invalidated before the mapped notify signal was being fired, meaning that queueing a redraw of an unmapped actor in the mapped notification callback could cause a crash. http://bugzilla.clutter-project.org/show_bug.cgi?id=2621