There's a regression in 1.19.1 which causes the cursor to jump when a
hold gesture is detected and then discarded because the motion event is
processed twice. In practice this is triggered by almost every flick of
finger across the touchpad where no finger previously touched it, and
thus results in jumps often enough that I frequently overshoot the
intended target of movement.

There's a proposed fix here:
https://gitlab.freedesktop.org/libinput/libinput/-/merge_requests/702
which I'm now testing and everything seems all right now.

(I'm tempted to mark this severity important, but I won't since it's
already in testing and desktop/mouse users are unaffected. I'm not
entirely sure if all touchpads are affected, but a safe bet is that this
indeed makes most laptops/touchpads very unpleasant.)