bba799a70c
We hide our own "New Window" item if the app itself includes a "new-window" action. That means that the separator between the built-in item and desktop actions introduces a small inconsistency depending on whether a "New Window" item is provided by the desktop action or ourselves. There's no good reason for that from a user's perspective, so remove the separator. Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/1948>