qwt zoomer::zoomed(QRectF) -->possible bug?!

Here is a strange behaviour which I am not sure but it looks like a possible bug.

Code:

---

connect(m_zoomer,SIGNAL(zoomed(QRectF)), this,SLOT(getZoomedArea(QRectF)));
 
 
void my2dPlot::getZoomedArea(QRectF newlyZoomedArea)
{
    QPointF a = newlyZoomedArea.topLeft();//(1535.7824557983249, -1.2464700495720682e-12)
    QPointF b = newlyZoomedArea.bottomRight();//(1572.0439921135721, 2.5595399250520858e-11)
    zoomedArea.setTopLeft(a);
    zoomedArea.setBottomRight(b);
}

---

As you can see from the numbers I got from debugging,

a is not a topleft but a bottomleft and
b is not a bottomright but a topright

Is it a bug? please reproduce

QRect::top/bottom are confusing because top is smaller than bottom. The reason behind it is, that in screen coordinates (0, 0) is topLeft. In most plots the coordinate system is mirrored.

Uwe