[Wayland-bugs] [Bug 90528] Add thumb detection

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=90528

            Bug ID: 90528
           Summary: Add thumb detection
           Product: Wayland
           Version: unspecified
          Hardware: Other
                OS: All
            Status: ASSIGNED
          Severity: normal
          Priority: medium
         Component: libinput
          Assignee: wayland-bugs at lists.freedesktop.org
          Reporter: peter.hutterer at who-t.net
            Blocks: 90526, 90527

For a thumb press on the T440s I get an ABS_MT_PRESSURE minimum of 100 to 110
(range [0, 255]), with the first one or sometimes two events being in the
80-100 range. Finger data is in the 60-90 range.

On an X220t, the thumb pressure is all over the place. This touchpad is quite
small, so the only way to use a thumb here is to only partially touch the
touchpad, so most thumb presses are actually in the 30-60 range.
Finger data is in the 50-90 range.

Based on those two touchpads: what may work is having a zone on the touchpad,
similar to touchpad buttons to label a thumb (or at least increase confidence
that it is a thumb).

We may need to limit thumb detection to certain touchpads over a specific size.

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