Tetrix example does not resize correctly when switching display alignment in WinCE

The Qt-Widgets Tetrix example does not resize correctly when switching from vertical to horizontal display alignment. (e.g. sliding the phone open)
The window is resized to a small bar that stretches over the complete screen width. This happens only when the frame is not moved before switching the display alignment.
Switching back to vertical will correctly resize the window to its original size, starting in horizontal alignment will start the example maximized.
Attached are screen shots of starting Tetrix in 480x800, 800x480 and switching from 480x800 to 800x480 where the bug appears.