Jonas Ådahl a598917e07 evdev: Provide the relative pointer motion event deltas
Compositors need more detailed information about motion events. Make it
possible to retrieve this information when running the evdev backend by
adding the information to the backend specific event struct.

https://bugzilla.gnome.org/show_bug.cgi?id=752752
2016-02-16 18:24:23 +08:00
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