Incorrect behavior of QPinchGesture::scaleFactor(),totalScaleFactor(),lastScaleFactor() in OSX

QPinchGesture::totalScaleFactor() always returns 1;
QPinchGesture::scaleFactor() and QPinchGesture::lastScaleFactor() return same value, the one that should be returned by totalScaleFactor().

The same interface functions return correct (expected) values on Windows 8.1.