Bug in the test function touch_arbitration_remove_tablet(): after litest_delete_device(tablet) for a tablet that is currently in proximity, we should get proximity events (and button release events where applicable), not just the device remove event.
See series starting here: https://lists.freedesktop.org/archives/wayland-devel/2018-February/036853.html
commit 44426b460c8fb20d392a9ddded273402e7c3750f Author: Peter Hutterer <peter.hutterer@who-t.net> Date: Mon Feb 5 11:27:09 2018 +1000 tablet: release the tablet state on device delete
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