title: QTabWidget refusing to auto-resize
body: <p>I'm attempting to have the following layout in qtcreator:</p>
  
  <pre><code>QWidget
    QSplitter
      QStackedWidget
        ...
      QStackedWidget
        QWidget (page)
          QTabWidget
  </code></pre>
  
  <p>Every single control that has a <code>sizePolicy</code> is set to <code>Expanding</code>. Despite this, neither the tab widget nor anything else I drop on that page widget gets autosized.</p>
  
  <p>I'm new to Qt, so forgive me if this is an obvious fix. Thanks.</p>