In mobile view (via Extension MobileFrontend) the collapse and expand bullets are not shown ... only the empty-bullet (grey) is visible.
is there any posibility to get this working?
Topic on Extension talk:CategoryTree
Should work since MediaWiki 1.31 phab:T171767
oh - okay --- we use MW 1.27.5 at the moment ... so we have to wait until we plan and do an update :)