[Wayland-bugs] [Bug 103208] One-finger movement on touchpad registered as two-finger scrolling with edge exclusion zone is touched

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=103208

--- Comment #4 from Peter Y. Chuang <peteryuchuang at gmail.com> ---
With respect to bug 95417, I think that's fair to let 2fg scrolling function
around the edge area. The problem I have is that anything on the edge zone
becomes part of a 2fg-scrolling movement even when nothing moves on the edge
zone.

I'm not a programmer, so I don't know how to fix this, but I suppose (and I may
be completely wrong on this) this may not require a hardware-specific
exception.

1. In a real 2fg-scrolling, both finger should move in the same direction. So
if the touch input on the edge zone is stationary, it should be treated as a
palm, and hence be ignored.

2. In a real 2fg-scrolling, the two fingers should be reasonably close to each
other. So if, e.g., the left edge is touch while the other finger is moving
aound the middle area, the input on the left edge should be treated as a palm,
and hence be ignored.

3. Maybe, just maybe, there's a way to detect palm around the edges properly,
so that we can do away with the edge zones altogether.

Just a few thoughts... not sure if any of the above makes any sense.

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