[Wayland-bugs] [Bug 90526] Allow left-clicks during 2fg clickfinger

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=90526

            Bug ID: 90526
           Summary: Allow left-clicks during 2fg clickfinger
           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

Follow-up from Bug 90261.

If clickfinger is enabled, two fingers on the touchpad cause a right click. In
some cases, this is the wrong thing to do. e.g. moving the cursor with an index
finger, then clicking with a thumb at the bottom of the touchpad.

Observations from OS X:
* a thumb press is ignored for the finger count, so thumb + 1 fg -> left, thumb
+ 2fg -> right
* for two fingers, if they're too far apart only a single finger click is
triggered
* there appears to be either some zone at the bottom of the pad or some timeout
so that sometimes using second finger to click won't trigger a right click.
Couldn't figure out what the exact conditions were here.

Not sure what the exact distances are, they seem to change with the vertical
difference - East-West it's about 5-6cm, North-South it's closer to 3-4,
anything else is somewhere in between.

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