After scale the view center is not under mouse, though resizing mode is set to AnchorUnderMouse

By default the Qt::WA_MouseTracking attribute is disabled, so that the MouseMove event is filtered out.

Do following steps:
1. Set the resizing mode to AnchorUnderMouse by calling setResizeAnchor()
2. Call setTransform() or scale()

Result:
The view center is not under mouse.

Possible fix:
Call setAttribute(Qt::WA_MouseTracking, true) when resizing mode is set to AnchorUnderMouse.

BTW:
I have reported another bug about VS addin, but it was incorrectly closed.
http://bugreports.qt.nokia.com/browse/QTBUG-6806
Jörg Bornemann says it's caused by incorrect vcproj, but I am 100% sure it's not.