handleCancelBackGesture method
Called when a predictive back gesture is canceled, indicating that no navigation should occur.
The observer which was notified of this gesture's handleStartBackGesture is the same observer notified for this.
Currently, this is only used on Android devices that support the predictive back feature.
Implementation
@override
void handleCancelBackGesture() {
hook.handler.handleCancelBackGesture();
}