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XWayland high-resolution scroll wheel support

Peter Hutterer requested to merge whot/xserver:wip/hi-res-scrolling into master

For details on the protocol see the Wayland merge request.

For us what matters is basically: we rely on wl_pointer.axis_v120 and prefer those events where available. This automatically covers non-wheel events with the existing code paths since they'll never get a v120 event. The only special case is where we get a v120 with a zero value, it indicates the current frame is a legacy-only frame and we can discard the information.

WIP because we need to line up all the pieces everywhere but there's a Fedora 32 COPR for testing.

cc @ofourdan, @pq, @jadahl, @carlosg

Edited by Peter Hutterer

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