cketcham 99932525e9 Improve handling of touch input for Slider with multiple thumbs
This changes the logic of picking the correct thumb on touch down. The closest thumb will be picked unless there are two thumbs in the same spot. In that case it will wait for enough movement in the x direction to determine which thumb to pick.

PiperOrigin-RevId: 292353858
2020-01-31 11:13:06 -05:00
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