title: QVideoWidget is new window after leaving fullscreen
body: <p>I want my video player to show the <code>QVideoWidget</code> fullscreen when double clicking. I have created a new class, inherited the <code>QVideoWidget</code> class and I then overwritten the <code>mousDoubleClickEvent</code>. </p>
  
  <pre><code>//Mouse event in new VideoWidget Class
  void VideoWidget::mouseDoubleClickEvent(QMouseEvent *event)
  {
      if( isFullScreen() )
          showNormal();
      else
          setFullScreen( true ); //Show in fullscreen
  }
  </code></pre>
  
  <p>The VideoWidget is used in my main window where (later) all other widgets are placed.</p>
  
  <pre><code>void MainWindow::setupUi()
  {
      QWidget* centralWidget = new QWidget( this );
      QHBoxLayout* centralLayout = new QHBoxLayout( centralWidget );
  
      videoWidget = new VideoWidget( this );
  
      setCentralWidget( centralWidget );
      centralLayout-&gt;addWidget( videoWidget );
  }
  </code></pre>
  
  <p>The problem is now that whenver I enter the full screen mode by double click and exit again by double click, the video widget is no longer in the MainWindow. It is a new window. How do I place it back to its old position again?</p>
  
  <p>Edit:
  The <code>videoWidget</code> seems to be in a new window AND in my <code>centralLayout</code>. But when I close the new window it disappears in my <code>centralLayout</code> too.</p>