gestureRecognizers property Null safety
Which gestures should be consumed by the web view.
It is possible for other gesture recognizers to be competing with the web view on pointer events, e.g if the web view is inside a ListView the ListView will want to handle vertical drags. The web view will claim gestures that are recognized by any of the recognizers on this list.
When this set is empty or null, the web view will only handle pointer events for gestures that were not claimed by any other gesture recognizer.
final Set<Factory<OneSequenceGestureRecognizer>>? gestureRecognizers;