[Wayland-bugs] [Bug 101435] use BTN_TOOL_TRIPLETAP for three-finger touch detection on 2-slot touchpads

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=101435

            Bug ID: 101435
           Summary: use BTN_TOOL_TRIPLETAP for three-finger touch
                    detection on 2-slot touchpads
           Product: Wayland
           Version: unspecified
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: libinput
          Assignee: wayland-bugs at lists.freedesktop.org
          Reporter: peter.hutterer at who-t.net

From: https://bugzilla.redhat.com/show_bug.cgi?id=1455443

Summary: synaptics 2-slot touchpads give us pointer jumps when the third finger
is down. The data we get is garbage, sometimes the two touches swap slots,
sometimes we get two x/y positions within the same frame for the same slot,
etc.
As a result, three-finger taps are unreliable.

This wasn't the case with synaptics because it merely relied on
BTN_TOOL_TRIPLETAP and didn't use the same motion detection we have in
libinput.

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