libinput: Disable tap-and-drag

[Bill Spitzak]

The timeout can be avoided by sending tap+drag as
press/release/(wait)/press/drag. I don't have it here to test but I
remember hearing this is what some (all?) mac implementations do.

This requires libinput to also decide whether a click is a "double click"
or not, the fact that our software was doing it's own timeout rather than
use the system api is why I heard about this. Moving double click decision
into libinput certainly seems consistent with what is being done here, and
would avoid a big annoyance where different clients have different rules.
The fact that this "mouse gesture" is interpreted by clients on X is just
historical because X predates the double-click idea.

Searching on the web shows that recent versions of OS/X turned off
tap-and-drag, since all the discussion was from people asking how to turn
it back on. This indicates two things: first that somebody at Apple decided
that it was not desirable to a big enough set of users to change the
default, second that there is a non-zero set of users that *do* like it.




On Fri, Jan 8, 2016 at 9:14 AM, Cyril B. <lagoon42 at gmail.com> wrote:

> Peter Hutterer wrote:
>
>> thanks for doing this work. tbh, I'm not a big fan of having this as a
>> configuration option. IMO if you are using tapping as an interaction
>> method
>> on the touchpad, having tap-and-drag available is the natural extension
>> and
>> I don't see why we should disable it.
>>
>
> I have the same issue as Caibin: I simply cannot use tap-to-click as it
> is, as it triggers unwanted drags all the time. I even wonder how other
> people do not have the same problem: do they systematically (consciously or
> not) wait before moving the cursor after tapping?
>
> However, I'd like to point out that both Windows and OSX have tap-and-drag
> disabled by default. That means that many users are probably used to that
> behaviour, and may find it frustrating not being able to turn off
> tap-and-drag.
>
> Regarding decreasing the timeout, in my case I doubt it would work as my
> tap + move combination is done very quickly, as fast as a double-tap
> actually. I'm willing to try it though, but I'm not sure what constant
> should be modified in the code.
>
> Caibin: thanks for the work, I'll test your branch very soon.
>
> --
> Cyril B.
>
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