Flutter Riverpod 在使用冻结副本更新状态时触发重建，即使没有任何更改

这一切都是关于在引擎盖下使用identical(old, current)来比较各州.identical为其本身提出了以下内容:

/// Check whether two references are to the same object.
///
/// Example:
/// ```dart
/// var o = new Object();
/// var isIdentical = identical(o, new Object()); // false, different objects.
/// isIdentical = identical(o, o); // true, same object
/// isIdentical = identical(const Object(), const Object()); // true, const canonicalizes
/// isIdentical = identical([1], [1]); // false
/// isIdentical = identical(const [1], const [1]); // true
/// isIdentical = identical(const [1], const [2]); // false
/// isIdentical = identical(2, 1 + 1); // true, integers canonicalizes
/// ```
external bool identical(Object? a, Object? b);

以下是一个完整的复制运行示例:

void main() => runApp(const ProviderScope(child: MyApp()));

@Freezed(genericArgumentFactories: true)
class Model with _$Model {
  const factory Model({required int id}) = _Model;
}

class Manager {
  static StateProvider<Model> modelProvider = StateProvider<Model>((ref) {
    Stream.periodic(const Duration(seconds: 1)).take(1000).listen((event) {
      ref.read(modelProvider.notifier).update((state) {
        final cloneState = state.copyWith();
        // const cloneState = Model(id: 1); //The print true in both cases
        print("${state == cloneState}"); //This print true
        print("identical: ${identical(state, cloneState)}"); //This print false
        return cloneState;
      });
    });

    return const Model(id: 1);
  });
}

class MyApp extends ConsumerWidget {
  const MyApp();

  @override
  Widget build(BuildContext context, WidgetRef ref) {
    var model = ref.watch(Manager.modelProvider);
    print("model change......................"); //print every second
    return MaterialApp(home: Text(model.id.toString()));
  }
}

我对该示例进行了一些修改，但本质保持不变.只有通过应用‘const’，我们才能实现不重建.