didPush method
The Navigator pushed route.
The route immediately below that one, and thus the previously active
route, is previousRoute.
Implementation
@override
void didPush(Route route, Route? previousRoute) {
MaskController.instance.isNavigationTransitioning = true;
MaskController.instance.clearMasks();
DevRev.updateTransitioningState(true);
_attachCompletionListener(route);
super.didPush(route, previousRoute);
}