[Wayland-bugs] [Bug 99703] Trackpad accidental two-finger touch stops cursor movement too early

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=99703

            Bug ID: 99703
           Summary: Trackpad accidental two-finger touch stops cursor
                    movement too early
           Product: Wayland
           Version: unspecified
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: libinput
          Assignee: wayland-bugs at lists.freedesktop.org
          Reporter: dinechin at redhat.com

On macOS and Windows, when you move the cursor around at high enough speed, an
accidental second finger touch on the trackpad does not stop the cursor.
Instead, the second finger is ignored, and cursor movement continues. This is
very comfortable, as it allows one to rest fingers on the trackpad while doing
large mouse movements, e.g. crossing the screen.

Linux, however, immediately switches to two-finger touch (i.e. scroll) as soon
as you touch the trackpad, irrespective of current cursor speed. This results
in frequent, inconvenient, accidental missed targets or random scrolls where
the intent was really mouse movement. This is especially annoying for people
who switch back and forth between Linux and other platforms.

If the cursor is presently moving at high enough speed, it is unlikely that the
person wants to immediately convert that movement to fast scrolling in the same
direction. It seems much more likely that the second finger is simply touching
the trackpad because it's a natural resting position.

Suggestion: Define a speed threshold above which an incoming second touch is
ignored. This could be an option if some people really prefer the current
behaviour.

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