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Fixes #38926 This patch implements the iOS behavior pointed out by @dkwingsmt at #38926 , which is also consistent with the performance of my settings application on the iPhone. ### iOS behavior (horizontal or vertical drag) ## Algorithm When dragging: delta(combined) = max(i of n that are positive) delta(i) - max(i of n that are negative) delta(i) It means that, if two fingers are moving +50 and +10 respectively, it will move +50; if they're moving at +50 and -10 respectively, it will move +40. ~~TODO~~ ~~Write some test cases~~