There's currently a bug that we continue showing the workspace minimap when the number of workspaces changes back to 1 during the session (ie. outside the overview). Fix that by also updating the workspaceThumbnails visibility when entering the overview. https://gitlab.gnome.org/GNOME/gnome-shell/-/issues/3819 Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/1741>
