title: QTreeWidget icon
body: <p>I'm developing an <code>Qt</code> application and I was displaying some data in <code>QTreeWidget</code> widget, but I needed it to adjust it to fit it's content so I changed the <code>QTreeWidget</code> to a custom widget from this post : <a href="https://stackoverflow.com/questions/32476006/how-to-make-an-expandable-collapsable-section-widget-in-qt">How to make an expandable/collapsable section widget in QT</a></p>
  
  <p>However I really don't like the arrow icon </p>
  
  <p><a href="https://i.stack.imgur.com/76PUq.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/76PUq.png" alt="enter image description here"></a></p>
  
  <p>And I would like to have the previous icon from <code>QTreeWidget</code></p>
  
  <p><a href="https://i.stack.imgur.com/d9stf.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/d9stf.png" alt="enter image description here"></a></p>
  
  <p>Is that some standard default icon I could easily switch to? If so where do I found it?</p>