[Wayland-bugs] [Bug 104569] Touchpad two-finger scrolling is 2x the velocity of cursor movement

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=104569

--- Comment #5 from Peter Hutterer <peter.hutterer at who-t.net> ---
You're observing this on the libinput level or in the applications? You need to
verify this first on the libinput level, running libinput debug-events and then
comparing the motion deltas with the pointer axis deltas from a comparable
two-finger scroll events.

I just stared at the code for a while and it is virtually the same minus the
acceleration applied to finger motion. Compare tp_gesture_post_pointer_motion()
and tp_gesture_handle_state_scroll(), they're almost identical. The only speed
difference would happen for very slow motions where the pointer has
deceleration applied but scrolling doesn't.

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