Testcase for enableFilter bug in Flutter's DropdownMenu

main.dart

// Copyright 2019 the Dart project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license
// that can be found in the LICENSE file.

import 'package:flutter/material.dart';

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

class Entry {
  final String label;

  const Entry(this.label);
}

final List<Entry> entries = [Entry("A"), Entry("B"), Entry("C")];

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

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      debugShowCheckedModeBanner: false,
      theme: ThemeData(
        colorSchemeSeed: Colors.blue,
      ),
      home: const MyHomePage(title: 'Flutter Demo Home Page'),
    );
  }
}

class MyHomePage extends StatefulWidget {
  final String title;

  const MyHomePage({
    super.key,
    required this.title,
  });

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

class _MyHomePageState extends State<MyHomePage> {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text(widget.title),
      ),
      body: Center(
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: [
            Text('DropdownMenu test'),
            DropdownMenu<Entry>(
              label: Text('Test Label'),
              dropdownMenuEntries: entries
                  .map(
                      (e) => DropdownMenuEntry<Entry>(value: e, label: e.label))
                  .toList(),
              enableFilter: true,
              initialSelection: entries[0],
            ),
          ],
        ),
      ),
    );
  }
}