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This PR properly resets the drag state when losing the gesture arena or when the recognizer stops tracking the current pointer. The _dragState enum was reset properly, but I had forgotten to also reset the `_start`, this caused an issue when the recognizer won the gesture arena the next time, as it tries to detect a drag given the old `_start` in `acceptGesture`, but the `_dragState` has been reset causing an assertion to trigger.