When a screen switch is triggered by PointerKeys, the device for
NewCurrentScreen is the keyboard. Submitting pointer events for this
keyboard (without valuators) has no effect as GPE ignores the event.
Force the dequeuing through the XTest device attached to this device.
Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>
Reviewed-by: Daniel Stone <daniel@fooishbar.org>