While a button is held SS5 hardware will give us single-finger packets
with x, y, and pressure equal to zero. This causes annoying jumps in
pointer position if a touch is released while the button is held. Handle
this by claiming zero contacts to ensure that no position events are
provided to the user.
Reviewed-by: NPali Rohár <pali.rohar@gmail.com>
Tested-by: NMichal Hocko <mhocko@suse.com>
Signed-off-by: NBen Gamari <ben@smart-cactus.org>
Signed-off-by: NDmitry Torokhov <dmitry.torokhov@gmail.com>