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Clutter actors unset their parent on dispose, after emitting the ::destroy signal, however this could cause ::parent-set signal emission. Since we assume that after the destruction has been completed the actor isn't valid anymore, and that during the destroy phase we do all the signal / source disconnections, this might create unwanted behaviors, as in the signal callbacks we always assume that the actor isn't in disposed yet. To avoid this, don't emit ::parent-set signal if the actor is being destroyed. Update the actor-destroy test to verify this behavior. https://gitlab.gnome.org/GNOME/mutter/merge_requests/769