That seems.. harder to use than what I described because being precise with three fingers (eg precise enough to drag to the correct row in detail view) isn’t easy. Also gesture accuracy decreases as the number of tools (read: fingers) goes up.

In all cases, that is easier to implement in code than a stateful transition like I described since there is no state persisting beyond the gesture itself, it just needs gesture_start and gesture_end support (with the difficulty being in determine if a three-finger gesture has started or if it’s actually a three-finger gesture on its way into becoming a four-finger gesture).