d416691896
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)