Marco Trevisan authored Sep 10, 2019 and Marco Trevisan committed Oct 02, 2019

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.

!769