GeisTouches from direct devices should be in window coordinates
GeisTouches provided by gesture events (GEIS_EVENT_GESTURE_BEGIN, GEIS_EVENT_GESTURE_UPDATE and GEIS_EVENT_GESTURE_END) should be in window coordinates if they come from a direct device (e.g. touchscreens) and in input device coordinates when from indirect devices (e.g. touchpads/trackpads).