4de65bd836
When using a tablet tool in relative mode motion compression may apply. Doing so drops the axes from the event, leading to a segfault later when we're trying to broadcast_axis() an event without axes. Fix this by making sure we copy the axes over during motion compression. All but the wheel are absolute so we can just take them from the new event but if we do have wheel data add them together and where the wheel changes direction skip motion compression. We can take a few shortcuts here because the clutter implementation guarantees exactly CLUTTER_INPUT_AXIS_LAST axes so we only need to put in warning checks in case that ever changes. Closes: https://gitlab.gnome.org/GNOME/mutter/-/issues/3766 Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/4117>