readOnly textField - cannot copy text

main.dart

import 'package:flutter/material.dart';

void main() => runApp(MyApp());

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Demo',
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: Scaffold(
        body: Padding(
          padding: EdgeInsets.all(24),
          child: Center(
            child: TextField(
              readOnly: true,
              controller: TextEditingController(text:
              'line 1\n'
              '\n'
              '\n'
              'line last'
              ),
            ),
          ),
        ),
      ),
    );
  }
}