MediaWiki theme: Add separator when toolbar items break on narrow
MediaWiki theme: Add separator when toolbar items break on narrow

Bug: T92315
Change-Id: Iee97c1f105e1f2f2f90bc3c65468189661738b84

wikimedia/oojs-ui,wikimedia/oojs-ui,wikimedia/oojs-ui,wikimedia/oojs-ui