When an ApplicationMenuItem becomes active, scroll the application scroll box so that it becomes visible. This stopped working when the gnome-shell API changed from getActive()/setActive() to the active GObject property. Closes https://gitlab.gnome.org/GNOME/gnome-shell-extensions/-/issues/562 Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell-extensions/-/merge_requests/391>