Carlos Garnacho dd60fa2bc6 backends: Use slot from cancel events
As it does seem from a read to libinput code, TOUCH_CANCEL events
actually do contain slot information, and are emitted per-slot.
This means we can avoid iterating over the slots ourselves, they
are still expected to be sent altogether.

https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/1486
2020-10-23 18:48:18 +00:00
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