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0139c69c84
Previously, the Slider used a drag gesture recognizer to move the head of the slider, but when the slider was in a vertical scroller, the recognizer would wait until the user moved the pointer by enough pixels to disambiguate between sliding the slider and scrolling the scroller. That worked fine for actual drags, but the slider should also move when the user taps the track. This patch introduces a tap recognizer to handle that behavior. To avoid the slider's drag and tap recognizers from competing with each other in the arena, this patch introduces the notion of a GestureArenaTeam, which lets several recognizers combine to form one entry in the arena. If that entry wins, the team picks the first of its recognizers as the winner, avoiding latency. Fixes #7454
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