QPropertyAnimation of a QGraphicsTextItem with a frame make the text shaky

plover

I'm animating a QGraphicsTextItem that I've added a frame around. During the animation the text seems to shake slightly inside the frame, which is very annoying.

An example code:

class MovingFrameText : public QGraphicsTextItem
{
   Q_OBJECT;
  public:
     MovingFrameText( ): QGraphicsTextItem(0)
     {
        setPlainText ( "Shaky ");
        QFont f =  font();
        f.setPixelSize(40);
        setFont(f);
        setFlags(QGraphicsItem::ItemIsMovable);
     }

     QRectF boundingRect() const
     {
        return QGraphicsTextItem::boundingRect().adjusted(-2,-2,+2,+2);
     }

     void paint(QPainter *painter,const QStyleOptionGraphicsItem *option,QWidget *widget)
     {
        QGraphicsTextItem::paint(painter,option,widget);
        painter->setPen(Qt::black);
        painter->drawRect(boundingRect());
     }

};

int main(int argc, char *argv[])
{
  QApplication app(argc,argv);

  MovingFrameText t;
  t.setPos(640,680);

  QGraphicsScene scene;
  scene.addItem(&t);

  QGraphicsView view(&scene);
  view.resize(640, 680);
  view.show();

  auto moveAnimation = new QPropertyAnimation( &t,  "pos" );
  moveAnimation->setDuration( 10000 );
  moveAnimation->setStartValue( QPointF(640, 680) );
  moveAnimation->setEndValue(  QPointF(0, 0) );
  moveAnimation->setEasingCurve( QEasingCurve::Linear );
  moveAnimation->start(QAbstractAnimation::DeleteWhenStopped);

  return app.exec();
}

Is there any way to fix this and make the animation smooth? I've tried to find a solution online for some time now, and I can't seem to find any.

plover

Two decent solutions at: https://stackoverflow.com/questions/52853322/qpropertyanimation-of-a-qgraphicstextitem-with-a-frame-make-the-text-shaky