d5f868bb25
When the `QuickMenuToggle` was a discrete button, it could be set to toggle mode, but the inner buttons no longer reacts as expected. Bind the `toggle-mode` property between the `QuickMenuToggle` and its contents so they behave as single toggle when enabled. Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/2664>