Marco Trevisan (Treviño) d416691896 boxpointer: Unset the sourceActor on destruction
A boxpointer sourceActor could be destroyed before the boxpointer itself.
In such case, unset the sourceActor reference, connecting to 'destroy' signal.

Fixes: https://gitlab.gnome.org/GNOME/gnome-shell/issues/1295
https://gitlab.gnome.org/GNOME/gnome-shell/merge_requests/576

(cherry picked from commit 2fd120162fe49bc85d7773435ac1412c512c5af4)
2019-06-26 17:02:36 +02:00
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