title: notifyItemInserted() not working as I was expecting
body: <p>What I need to do is inserting item to the top of <code>RecyclerView</code>. I have adapter which persists <code>List</code> of my items and when I want to add to the top of <code>RecyclerView</code> I'm simply using this code:</p>
  
  <pre><code>mItems.add(0, item);
  notifyItemInserted(0)
  </code></pre>
  
  <p>Unfortunately it's just reloading last item of <code>RecyclerView</code>. Of course when I change <code>notifyItemInserted</code> to <code>notifyDataSetChanged()</code> everything works fine. Why is <code>notifyItemInserted</code> not appropriate?</p>