title: QScrollArea issue with vertical scroll
body: <p>I have read few pages about QScrollArea, and I couldn't solve my issue. I have the next code:</p>
  
  <pre><code>QDialog *window = new QDialog;
  window-&gt;resize(300, 300);
  
  for(int i = 0; i &lt; 50; ++i)
  {
      QLabel *label = new QLabel(window);
      label-&gt;move(10, i * 15);
      label-&gt;setText("Text");
  }
  
  QScrollArea *area = new QScrollArea;
  area-&gt;setWidget(window);
  area-&gt;show();
  </code></pre>
  
  <p>It seems that the vertical scroll from QScrollArea doesn't appear. I can't use QVBoxLayout because on my QDialog I don't have only QLabels aligned vertically ( this is just a simplified version of my QDialog ).</p>