title: Style the QTreeView/QTreeWidget item in edit state
body: <p>I want to style using <code>QSS</code> the line edit that appears when I edit a <code>QTreeView/QTreeWidget</code> item.</p>
  
  <p>Here is an example:</p>
  
  <p><img src="https://i.stack.imgur.com/0meqT.png" alt="enter image description here"></p>
  
  <p>This is a standard <code>QTreeWidget</code> with <code>QTreeView::item { min-height: 25px; }</code> style applied to it.</p>
  
  <p>My question is: Is it possible to have the line edit that appears when I double click the item the same size as the item itself? Or maybe of a certain height in pixels?</p>
  
  <p><em>Note:</em> I wouldn't want to use a custom delegate for this, I would like to do it in <code>QSS</code> only.</p>