libinput and scrolling threshold/deadspot

[Mads]

> On Fri, Nov 06, 2015 at 01:31:06PM +0100, Mads wrote:
> 
>> Hi!
>> 
>> Using xf86-input-libinput 0.15.0 and libinput 1.1.0, are there any way 
>> to
>> tweak the size of the scrolling deadspot? That is, how many pixels of
>> movement libinput ignores before starting a scroll event (e.g. two 
>> fingers
>> vertical scrolling, how long you have to drag before the scrolling
>> starts)...
>> 
>> Great work with libinput 1.1, I've gone from evdev/synaptics to 
>> libinput on
>> all of my devices now, couldn't be happier :) The scrolling deadspot 
>> thing
>> is the only nitpick I have left...
> 
> It's not configurable and currently fixed at 2mm. The main issue is 
> that we
> need some sort of finger movement before we can start scrolling to 
> determine
> whether the gesture is a two-finger scroll or a pinch movement. We're
> already biased towards scrolling in some corner-cases but some of the
> threshold remains. Any suggestions on how to fix this are appreciated.
> 
> Cheers,
> Peter

I applied Hans Goedes "[PATCH libinput] touchpad: reduced the 2fg scroll 
threshold to 1mm" to libinput 1.1.0, and (I hope it's not placebo but) 
the scrolling behaviour seems a lot better :) Hope this will make it to 
libinput 1.1.1!

- Mads