GcalEventWidget currently doesn't track the preview popover, and that can easily crash Calendar upon destruction. Track that, and unparent on dispose. Closes: https://gitlab.gnome.org/GNOME/gnome-calendar/-/issues/986
GcalEventWidget currently doesn't track the preview popover, and that can easily crash Calendar upon destruction. Track that, and unparent on dispose. Closes: https://gitlab.gnome.org/GNOME/gnome-calendar/-/issues/986