[Wayland-bugs] [Bug 90990] AlpsPS/2 ALPS DualPoint TouchPad scrolling is jumpy

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=90990

--- Comment #2 from Peter Hutterer <peter.hutterer at who-t.net> ---
ok, afaict what's happening here is that you set the finger down, then move it
and edge scrolling doesn't trigger until you pass the built-in motion threshold
(5mm). When you pass it, the first scroll event includes the full motion so far
but it's accelerated too which causes that massive jump.

I guess that leaves three options:
* reduce the initial threshold, but would likely cause the same jump even at
3mm and I don't want to go below that
* don't release the full distance but just the last delta when we hit the
threshold. this would add a dead zone to scrolling
* replay the motion history in full once the threshold is hit. this would only
add a slight delay to scrolling

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