[Wayland-bugs] [Bug 93504] Reduce/remove two-finger scrolling threshold

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=93504

--- Comment #15 from Peter Hutterer <peter.hutterer at who-t.net> ---
ok, this patch breaks (swipe) gestures pretty badly, I'll have to recall that.
it's hard now to trigger a gesture without scroll events, something that will
become a problem when gestures actually do something on the desktop. We'll need
to find a different solution here.

The main problem is: for a swipe gesture, the fingers are effectively in the
same position as for a two-finger scroll event. If the fingers are set down in
separate event frames (likely) we transition from 1 to 2 to 3 fingers in the
gesture state machine. When we hit two fingers we go to scrolling and send the
current state before transitioning to 3 fingers and stopping the scrolling
again.
Pinch gestures can be similarly affected if the two top fingers are set down
before the thumb.

I think we'll need a scroll cancel event to work around this.

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