[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

Peter Hutterer <peter.hutterer at who-t.net> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         Depends on|                            |95417
             Status|NEEDINFO                    |ASSIGNED

--- Comment #3 from Peter Hutterer <peter.hutterer at who-t.net> ---
Linking to bug 95417 here because we introduced that behaviour there. There is
a problem with 2fg scrolling and edge palm detection: our edge palm detection
triggers when a finger is within the edge zone and either stays there or moves
vertically within that zone. see this link for an illustration of the process:
http://wayland.freedesktop.org/libinput/doc/latest/palm_detection.html

for 2-finger scrolling, the vertical motion is almost guaranteed. especially on
small touchpads (but not exclusively so), having one finger in the edge zone is
not that uncommon. so we purposely ignore palm edge fingers for 2-finger
scrolling and treat the finger normally.

Not sure what to do here, having this as a hardware-specific exception would
make this a lot harder to maintain.


Referenced Bugs:

https://bugs.freedesktop.org/show_bug.cgi?id=95417
[Bug 95417] Disable edge palm detection during 2fg scrolling
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