Pinch zoom zooms too much
Submitted by Bastien Nocera
Pinch zoom seems to be zooming too quickly compared to how much I've moved my fingers on the screen.
If I put my fingers on two points on the screen, and start scaling them, the zoom is increased more than I've moved my fingers (the points that were under my fingers are "out" of my fingers by a couple of centimetres).
Version: git master