[Qt-interest] move() a widget and mapTo()

[Giacomo]

Hi to all.

I am experiencing a strange behaviour.

In my Qt 4.5.3 application I call move() on a widget and move it by one pixel.
after move(), widget->mapTo(widget->parentWidget(), newpos) shows a delta 
x (or y) of 2 instead of 1 pixel only.

The code 

qDebug() << "widget topLeft() BEFORE: " << w->geometry().topLeft() << " 
mappedTo(): " << w->mapTo(MangoWidget::instance(), w->geometry().topLeft());
	
w->setGeometry(QRect(newTopLeft, w->geometry().size()));

	 qDebug() << "widget topLeft() AFTER: "  << w->geometry().topLeft() << " 
mappedTo(): " << w->mapTo(MangoWidget::instance(), w->geometry().topLeft());


produces output:

widget topLeft() BEFORE:  QPoint(12,23)  mappedTo():  QPoint(374,368)                                                                                               
widget topLeft() AFTER:  QPoint(11,23)  mappedTo():  QPoint(372,368)   

As you can see widget position changes of 1 pixel 12->11 but the mapped 
position changes of 2 pixels (374->372)

Thanks in advance for any hint.

Giacomo