Mouse wheel inoperative when running on Linux in a VM

[timangus]

When running inside VMWare, mouse events (all of them) are identified as coming from a TouchPad QPointingDevice rather than as a mouse. Graphia exposes a different UI for zooming depending on the device type being used, which manifests as the mouse wheel doing nothing. By pure coincidence, setting the option Trackpad Pan Gesture Zooms on Options/Misc results in the correct function call being made so is a convenient workaround under this regime.

This is probably an upstream bug in Qt and/or VMWare, but worth mentioning here regardless.