[Wayland-bugs] [Bug 98799] "Clickfinger" behavior interferes with normal operation with a thumb is resting on the bottom of the touchpad

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=98799

            Bug ID: 98799
           Summary: "Clickfinger" behavior interferes with normal
                    operation with a thumb is resting on the bottom of the
                    touchpad
           Product: Wayland
           Version: 1.5.0
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: libinput
          Assignee: wayland-bugs at lists.freedesktop.org
          Reporter: pointedstick at zoho.com

I have an HP Spectre x360 (Kaby Lake) with a touchpad, running Fedora 25, GNOME
3.22, Wayland, and libinput 1.5.1 (release 1.fc25).

When I set the touchpad clicking behavior to "Areas", I am able to rest my
thumb on the bottom edge of the pad without it interfering with touchpad
operation, as described in
https://wayland.freedesktop.org/libinput/doc/latest/clickpad_softbuttons.html.
In particular, when the thumb is resting there, I can use my index finger to
move the pointer without removing my thumb.

However, when I change the click behavior to "Clickfinger" to enable two-finger
right-clicking, suddenly the thumb's presence interferes with operation, and
when the thumb is on the bottom of the pad, sometimes causes basic index finger
cursor movement feel "stickier" and not trigger sometimes, or two-finger
scrolling to be incorrectly triggered. Thumb ignoring seems to be vastly more
reliable with "Areas" mode.

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