REG from 4.7: Windows /VS: Resolve mask of fonts is 0

Various font-related bugs can be observed in Qt 4.8:

• Qt Designer: Changed font properties of a widget are not saved/nor shown in preview
• Qt Creator: Saved Font settings are not applied to new editors/after restart

It looks like there is some regression in the resolve mask handling on Windows. The attached sample code prints:
[Qt version Font resolve mask]
4.7.4 FONT QFont( "Courier,15,-1,5,50,0,0,0,0,0" ) 3
4.8.0 FONT QFont( "Courier,15,-1,5,50,0,0,0,0,0" ) 0

It works on Linux and with MinGW32 , 32bit VS9, though .
It could arguably be a compiler bug of VS2010/64bit.