https://github.com/flutter/flutter/issues/53441

main.dart

import 'package:flutter/material.dart';

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

class MyApp extends StatelessWidget {
  // This widget is the root of your application.
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: MyHomePage(),
    );
  }
}

class MyHomePage extends StatefulWidget {
  MyHomePage({Key key}) : super(key: key);

  @override
  _MyHomePageState createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  final GlobalKey<NavigatorState> _navigatorKey = GlobalKey();

  @override
  Widget build(BuildContext context) {
    return Row(
      children: <Widget>[
        SizedBox(
          width: 200,
          child: Scaffold(
            body: Container(
              alignment: Alignment.center,
              padding: EdgeInsets.all(16),
              child: TextField(
                decoration: InputDecoration(hintText: 'Type here'),
                onChanged: (newValue) {
                  print('done. newValue: $newValue');
                  _navigatorKey.currentState.pushAndRemoveUntil(
                      MaterialPageRoute(builder: (_) => PageWithTextField()),
                      (route) => false);
                },
              ),
            ),
          ),
        ),
        Expanded(
          child: Navigator(
            key: _navigatorKey,
            onGenerateRoute: (settings) {
              assert(settings.name == Navigator.defaultRouteName);
              return MaterialPageRoute<void>(
                settings: settings,
                builder: (context) => EmptyPage(),
              );
            },
          ),
        ),
      ],
    );
  }
}

class EmptyPage extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
        appBar: AppBar(
          title: Text('Lorem'),
        ),
        body: const Center(
          child: Text('Nothing to see here.'),
        ));
  }
}

class PageWithTextField extends StatefulWidget {
  @override
  _PageWithTextFieldState createState() => _PageWithTextFieldState();
}

class _PageWithTextFieldState extends State<PageWithTextField> {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
        appBar: AppBar(
          title: Text('Lorem'),
        ),
        body: const Center(
          child: Text('Detail Page'),
        ));
  }
}