title: Qt: Overlapping semitransparent QgraphicsItem
body: <p>I've been working with QGraphicsView for a while and I am facing a requisite that I am not sure if it can be fulfilled by using this framework.</p>
  
  <p>Putting it as simple as possible, I have 2 overlapping RectItem with a semitransparent QBrush (the same one for both). Is it possible to prevent the overlapping area from becoming more opaque? I just want the whole area to have the same color (this will occur only if both rects are fully opaque, but sometimes that is not the case)</p>
  
  <p>I know it might seem a weird requisite, but the old graphics engine my colleagues used allowed it.</p>
  
  <p>Any ideas?</p>