title: RecyclerView SnapHelper fails to show first/last items
body: <p>I have a <code>RecyclerView</code> which is attached to a <code>LinearSnapHelper</code> to snap to center item. When I scroll to the first or last items, these items are not fully visible anymore. This problem is shown in the following image. How to solve it?</p>
  
  <p><a href="https://i.stack.imgur.com/PX3vR.gif" rel="noreferrer"><img src="https://i.stack.imgur.com/PX3vR.gif" alt="enter image description here"></a></p>