title: QLabel in QScrollArea
body: <p>If you check out scrollareawidgetcontents there is an "error" sign.</p>
  
  <p><img src="https://i.stack.imgur.com/tAzlp.png" alt="qt designer scroll area error"></p>
  
  <p>Scroll area has size policy set to:</p>
  
  <ul>
  <li>horizontal: expanding</li>
  <li>vertical: fixed</li>
  </ul>
  
  <p>Scroll area widget contents has size policy set to:</p>
  
  <ul>
  <li>horizontal: expanding</li>
  <li>vertical: expanding</li>
  </ul>
  
  <p>If I try to add a Label with size policy:</p>
  
  <ul>
  <li>horizontal: expanding</li>
  <li>vertical: ignored</li>
  </ul>
  
  <p>The label is not scrollable.</p>
  
  <p>What I want to achieve with this is a scrollable non-editable text area.</p>
  
  <p>My concrete questions:</p>
  
  <ul>
  <li>why does that scrollareawidgetcontents error show up?</li>
  <li>how to achieve what I want to achieve?</li>
  </ul>