title: QListView drop indicator styling
body: <p>I am using <code>QListView</code> to show a list of items that I can drag and drop to change their order.
  The problem is that:</p>
  
  <ul>
  <li>the drop indicator is just a very small line (1px thickness)</li>
  <li>the drop area is so narrow so one needs to be really accurate to drop an item correctly between two other items.</li>
  </ul>
  
  <p>I wonder if it is possible to change the styling of the drop indicator of <code>QListView</code> so the line is thicker and the drop area is wider.</p>