QDateEdit reacts to mouse scroll wheel even when the mouse left the QDateEdit widget (Mac OS X)

I want to use a scrollable QDateEdit, but it should stop reacting to mouse scroll wheel when the mouse pointer left the QDateEdit widget.

Click inside a QDateEdit, now move the mouse pointer over any non scrollable widget, like a label or window background, scroll the mouse wheel - the QDateEdit changes the date.

This is particularly nasty when combined with MagicMouse, which has all its surface as a scroll wheel, and creates lots of unintentional scrolling.