[Wayland-bugs] [Bug 94989] touchpad (on X220) less precise when moving in from the edges

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=94989

--- Comment #21 from Peter Hutterer <peter.hutterer at who-t.net> ---
(In reply to Michael Biebl from comment #20)
> The problem still persists though. Sliding in from the bottom, I only get
> movement of the cursor after 1cm or so. Sliding from top to bottom I get
> movement of the cursor all the way.

yep, that's intended. the bottom 10mm are reserved for the buttons (left vs
right) and we discard movement when a finger is set down inside that button
area. The reason is quite simple: when you press the touchpad to click, your
finger shape changes and you'd get a movement before the button press which
could cause you to miss the target. see this link for some details:
https://wayland.freedesktop.org/libinput/doc/latest/clickpad_softbuttons.html

when you move into the area from the top then we don't discard the motion.
the only way around this is changing over to clickfinger behaviour.

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