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c695234c5c
Remember whether ABS_X or ABS_Y were reported before the SYN event and only
update the old_vals[0, 1] if we got data for them.
Touchpads that reported pressure data before x/y would otherwise update
old_x/y with bogus values, leading to jumps when the first x/y coordinates
were actually reported.
Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>
(cherry picked from commit d9809d7edd)