title: QMessageBox .gif file is not visible
body: <p>I have a <code>QMessageBox</code> and I put an animated gif on this Dialog with <code>QLabel</code> and inside <code>QMovie</code> instead of an icon. But there is a problem with the gif. When I refresh the screen somehow <code>QMessageBox</code> is working but the gif is not visible anymore.</p>
  
  <pre><code>QMessageBox msgBox(this);       
  msgBox.setWindowTitle("Warning");
  msgBox.setText("      This element is UNDER CONSTRUCTION!");
  QLabel* label = new QLabel(&amp;msgBox);                
  label-&gt; setWindowFlags(Qt::FramelessWindowHint);
  QPixmap p("Resources/Images/General/construct.gif");
  
  label-&gt;setPixmap(p);
  label-&gt;setFixedHeight(40);
  label-&gt;setFixedWidth(45);
  
  QMovie *movie = new QMovie("Resources/Images/General/construct.gif");
  label-&gt;setMovie(movie);
  movie-&gt;start();    
  
  label-&gt;show();
  
  QAbstractButton *myYesButton = msgBox.addButton("I accept risk!", QMessageBox::YesRole);
  QAbstractButton *myNoButton  = msgBox.addButton("Cancel", QMessageBox::NoRole);         
  msgBox.exec();
  
  if(msgBox.clickedButton() == myNoButton) return;
  </code></pre>