import 'package:flutter/material.dart';

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

class MyApp extends StatelessWidget {
  const MyApp({super.key});

  @override
  Widget build(BuildContext context) {
    return MaterialApp(home: const MyHomePage());
  }
}

class MyHomePage extends StatefulWidget {
  const MyHomePage({super.key});

  @override
  State<MyHomePage> createState() => _MyHomePageState();
}

final _initialText = List.generate(
  500,
  (int index) => '${index + 1} abcdefg hijklmnop qrs tuv',
).join('\n');

class _MyHomePageState extends State<MyHomePage> {
  final _controller = TextEditingController(text: _initialText);

  @override
  void dispose() {
    _controller.dispose();
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(title: Text('TextField Bug on Web')),
      body: TextField(controller: _controller, maxLines: null),
    );
  }
}