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b1587f0716
When the top window actor is destroyed, we need to make sure that all its references are removed or it could be picked again in next windows sync, causing crashes. Since the window might or might not be destroyed when removed (depending weather animations are in progress over it or not), it's just safer to wait it to be destroyed before cleaning up any of its reference. https://bugzilla.gnome.org/show_bug.cgi?id=791006