Horizontal MouseWheels are not delivered to the image on Windows

Hi all,

short notice only. When I turn on #showEvents on HandMorph in Squeak under Windows, I can see MouseWheelEvents are delivered by the VM for vertical gestures, but not for horizontal gestures. Instead of horizontal wheel events, the gestures are mapped to arrow keyboard events. Maybe someone is familiar with this implementation and knows a simple way to fix it. :-)

Best,

Christoph