alwaysVisible trumps other UI show/hide rules

Overrule this UI logic
if (content.scrollHeight is content.clientHeight) or (
          @pane.outerHeight(true) >= content.scrollHeight and contentStyleOverflowY isnt SCROLL)
        do @pane.hide
        @isActive = false
      else if @el.clientHeight is content.scrollHeight and contentStyleOverflowY is SCROLL
        do @slider.hide
      else
        do @slider.show