如何在flutter中移除包含主页的backstack

import 'package:flutter/material.dart';

void main() {
  runApp(MyApp());
}

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: HomePage(),
    );
  }
}

class HomePage extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('Home'),
      ),
      body: Center(
        child: RaisedButton(
          child: Text('Remove backstack'),
          onPressed: () {
            Navigator.pushReplacement(
              context,
              MaterialPageRoute(builder: (context) => NewPage()), // 替代当前的主页
            );
          },
        ),
      ),
    );
  }
}

class NewPage extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('New Page'),
      ),
      body: Center(
        child: RaisedButton(
          child: Text('Remove backstack'),
          onPressed: () {
            Navigator.popUntil(
              context,
              ModalRoute.withName('/'), // 移除backstack中包含主页的所有页面
            );
          },
        ),
      ),
    );
  }
}