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Resolves #151446 `DragGestureRecognizer` defines several private abstract methods that are implemented by its subclasses. In the **super_editor** package, we'd like to extend `PanGestureRecognizer` to make it more aggressive, so it can win the gesture arena when placed inside a `CustomScrollview`. However, since we can't override private methods, tweaking this single function would involve copying the entire `DragGestureRecognizer` interface and its `PanGestureRecognizer` implementation. <br> Methods that were updated in this PR: | Method | Rationale | |---|---| | `_hasSufficientGlobalDistanceToAccept` | This is the most important method for us. Overriding this method allows tweaking the PanGestureRecognizer to be more aggressive. | | `_considerFling` | In **super_editor** we use the PanGestureRecognizer, but we want the fling gesture to behave as if it was a VerticalDragRecognizer. We'll use the fling gesture just to scroll vertically. | | `_finalPosition` | I added a getter to be able to access it inside `_considerFling`. | | `_globalDistanceMoved` | I added a getter to be able to access it inside `_hasSufficientGlobalDistanceToAccept`. |