gestures: average motion by active touches, not moved touches
When two fingers move slowly, an event frame may only have one finger motion, followed by a frame with the other finger's motion. If we only divide by the number of dirty touches, the speed of the gesture increases whenever that happens. Reported-by:Hans de Goede <hdegoede@redhat.com> Signed-off-by:
Peter Hutterer <peter.hutterer@who-t.net> Reviewed-by:
Hans de Goede <hdegoede@redhat.com>