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cfdca246f2
I've overseen quite an important case in commit
98a5cb37d9: Repicking only when actors get
destroyed is not enough, we actually need to repick when actors go
hidden/unmapped.
While we could also listen to notify::mapped just like we listen to
notify::reactive, it seems better to avoid using property notifications
here due to the usage of g_object_freeze/thaw_notify() in ClutterActor.
It can lead to the stage receiving a notify::mapped with mapped = true
for a pointer actor, which really shouldn't happen (just like
notify::reactive with reactive = true shouldn't happen).
Fixes: https://gitlab.gnome.org/GNOME/gnome-shell/-/issues/5124
Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/2333>