addParent method
Implementation
@override
ModularRoute addParent(covariant ParallelRoute parent) {
// ignore: invalid_use_of_visible_for_overriding_member
final newRoute = super.addParent(parent) as ParallelRoute;
return newRoute.copyWith(
customTransition: customTransition ?? parent.customTransition,
transition: transition ?? parent.transition,
duration: duration ?? parent.duration,
);
}