[PATCH libinput 00/14] gestures: add three-finger pinch

[Peter Hutterer]

This patchset adds support for three- and four-finger pinch gestures.
Patches 01 through to 10 are just prep work, the rest is the actual meat.

The one thing I'm quite unhappy about it is explained in patch 14 - on most
touchpads we can't distinguish between a three-finger pinch or swipe
gesture, the datastream is identical. That happens whenever the index and
middle finger are the first to be put on the touchpad. 

I've considered disabling this for 2-slot touchpads, but since they comprise
the majority of touchpads that's not particularly useful. I guess it remains
to be seen if misdetection of gestures is a real issue.

Cheers,
  Peter