title: QGraphicsPixmapItem not showed in QGraphicsScene in deployed mode
body: <p>With the following code, on my workstation (QtCreator an "manually" running) all works fine. But on an other pc with no Qt installation my application don't show the QGraphicsPixmapItem.</p>
  
  <pre>
  image = new QGraphicsPixmapItem(QPixmap(urlFile));
  image->setZValue(-5000.0);
  scene->setSceneRect(QRectF(0, 0, image->pixmap().width() + 200, image->pixmap().height() + 200));
  scene->addItem(image);
  view->setMaximumWidth(image->pixmap().width() + 200);
  view->setMaximumHeight(image->pixmap().height() + 200);
  
  qreal centerX = (scene->width() / 2.0) - (image->pixmap().width() /2.0);
  qreal centerY = (scene->height() / 2.0) - (image->pixmap().height() /2.0);;
  image->setOffset(QPointF(centerX, centerY));
  </pre>
  
  <p>Do you know why ?</p>