title: QML - How to know if a child has keyboard focus
body: <p>I think I know how to use FocusScopes and how to handle keyboard focus.</p>
  
  <p>But I can't find a clever way to figure out if one of my child items
  or theirs or anyone below me has keyboard focus.</p>
  
  <p>The documentation for <strong>FocusScope</strong> says:</p>
  
  <blockquote>
    <p>When a focus scope receives active focus, the contained element with
    focus set (if any) also gets the active focus. If this element is also
    a FocusScope, the proxying behavior continues. Both the focus scope
    and the sub-focused item will have activeFocus property set.</p>
  </blockquote>
  
  <p>A FocusScope therefore <strong>will have activeFocus set to false</strong>
  when the focus was given to a contained FocusScope. Is there a way to figure out if that was the case? How can I know if at least a contained FocusScope received the focus?</p>