Xwayland scrolling

This issue occurs when a seat has one non-discrete and one discrete scrolling device (i.e. a laptop with trackpad and a clicking-wheel mouse connected to it). Under some condition (see repro below), clicks from the scrolling wheel are being skipped by xwayland, when scrolling direction is changed (i.e. ↑↑↓↑, where last two clicks are ignored by the application).

To reproduce:

1. Run any wayland compositor with xwayland support on a laptop with mouse connected
2. Start xev on it
3. Produce some scrolling via touchpad
4. Now, scrolling with mouse will be skipped (see xev logs)

This issue is not reproducible on Xorg WM's, i.e. i3wm, so I might guess the bug is somewhere here: https://gitlab.freedesktop.org/xorg/xserver/-/blob/master/hw/xwayland/xwayland-input.c#L682-723