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Some touchscreens seem to oscillate heavily for a while after touching the screen. Implement support for sampling the screen until we get two consecutive values that are close enough. Signed-off-by: Imre Deak <[email protected]> Signed-off-by: Juha Yrjola <[email protected]> Signed-off-by: David Brownell <[email protected]> Signed-off-by: Dmitry Torokhov <[email protected]>