title: Preventing Menu from exceeding screen size
body: <p>I've got a very large list of Menu-Items added to a Menu element, leading to the menu growing to a size bigger than even the screen height.
  Besides splitting the items into more sub-menues, I have been unable to find any solution to prevent this from happening, since neither the Layout-Manager nor the maximum size of the Menu-Element seem to adress this.</p>
  <p>I would prefer a kind of multi-column menu or scrollable menu instead, but as far as I can tell there is no implementation of either kind. I'm open to any ideas on how to archieve this.</p>