title: RecyclerView setOverScrollMode doesn't work
body: <p>My <code>RecyclerView</code> seems to be ignoring <code>setOverScrollMode</code>. The value is set to <code>View.OVER_SCROLL_IF_CONTENT_SCROLLS</code> and I see the overscroll glow in 5.1.1, but the content can't scroll. </p>
  
  <p>Any ideas, what I can check?</p>