title: How does QWidget size when used as a window?
body: <p>Several examples on trolltech use QWidget rather than a QMainWindow as the main window for simple Qt applications.</p>
  
  <p>Now I need just a simple window with a single content widget (QGlWidget) that covers the entire client area.</p>
  
  <p>However, when I show a QWidget window with a single content window it automatically resizes itself to be tiny.</p>
  
  <p>If I create the QWidget parent window without a child It is a nice large default size.</p>
  
  <p>I don't want to resort to using Layouts for a single child window :/</p>