89db7bbb12
Dummy menus may emit ::open-state-changed multiple times for the same state. Avoid doing that so that the PopupMenuManager is happy not having to handle reentrancy. Closes: https://gitlab.gnome.org/GNOME/gnome-shell/-/issues/5064 Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/2178>