title: A widget contained in more than one cell in a QGridLayout is not centered
body: <p>The question sais it all. </p>
  
  <p>I have a 5 x 3 grid.</p>
  
  <p>It looks like this </p>
  
  <pre><code>row 0:  buttonA--buttonA--buttonA   nothing   buttonB--buttonB--buttonB
  
  row 1:  empty row
  
  row 2:  buttonC  nothing  buttonD   nothing   buttonE  nothing  buttonF     
  </code></pre>
  
  <p>In the spaces where there is nothing in the whole column or row the minimumRowHeight and all of those settings would work. Right?</p>
  
  <p>Well. The button A and button B (and the rest), never get centered over those 3 cells they share. NEVER. doesn´t matter what i write on the parameters for the layout. </p>
  
  <p>I erased the code because it finally got it using a Vertical Layout, and inside, two horizontal layouts. Those get centered that way. But i would like to position them better.</p>
  
  <p>What doesn´t work is when adding a widget, using:</p>
  
  <p>addWidget( widget, 0,0 , 2,0 , Qt::AlignHCenter );   not even AlignCenter works.</p>
  
  <p>How to make it centered or aligned to the right?</p>
  
  <p>Thanks!</p>