QDialog on Linux: resizing the dialog shifts the dialog position

Hello,

I went from Qt 4.8 to Qt 5.1.0

When I scale a QDialog with setFixedSize(), then position of the dialog changes too. This also affected Qt 4.8, but not that heavily, the problem seems to have become more important in Qt 5.1.0.

The problem only affects Linux, Windows and Mac work fine

Refer to the demo app that illustrates this