title: QComboBox text color doesn't change as expected
body: <p>I have a simple QComboBox but I cannot figure out how to change the text color of the selected item. It stays black but it should be white. I used the color:white; properties but it seems to affect only the color of the popup item list. </p>
  
  <p>this is my current stylesheet:</p>
  
  <pre><code>background: rgb(61,61,61);
  color: rgb(255,255,255);
  selection-color: rgb(255, 255, 255);
  </code></pre>
  
  <p>the QComboBox keeps having this behaviour:</p>
  
  <p><img src="https://i.stack.imgur.com/cbdWx.png" alt="enter image description here"></p>
  
  <p><img src="https://i.stack.imgur.com/FD4rT.png" alt="enter image description here"></p>
  
  <p>as you can see the selected item still has an unspecified black color.</p>