Fix ExpansionTile Expanded/Collapsed announcement is interrupted by VoiceOver

[TahaTesser]

fixes ExpansionTile accessibility information doesn't read Expanded/Collapsed (iOS)

Code sample

expand to view the code sample

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(
      debugShowCheckedModeBanner: false,
      home: Scaffold(
        appBar: AppBar(
          title: const Text('ExpansionTile'),
        ),
        body: const ExpansionTile(
          title: Text("Title"),
          children: <Widget>[
            Placeholder(),
          ],
        ),
        floatingActionButton: FloatingActionButton(
          onPressed: () {},
          child: const Icon(Icons.add),
        ),
      ),
    );
  }
}

Before

before.mov

After

after.mov

Pre-launch Checklist

• I read the Contributor Guide and followed the process outlined there for submitting PRs.
• I read the Tree Hygiene wiki page, which explains my responsibilities.
• I read and followed the Flutter Style Guide, including Features we expect every widget to implement.
• I signed the CLA.
• I listed at least one issue that this PR fixes in the description above.
• I updated/added relevant documentation (doc comments with ///).
• I added new tests to check the change I am making, or this PR is test-exempt.
• I followed the breaking change policy and added Data Driven Fixes where supported.
• All existing and new tests are passing.

If you need help, consider asking for advice on the #hackers-new channel on Discord.

[TahaTesser]

cc: @math1man

[TahaTesser]

We agreed to fix this issue by delaying semantic announcement on iOS in #132264 (comment). While #122101 is open.

[goderbauer]

LGTM

[TahaTesser]

@QuncCccccc
Can you please also check why this is failing Google Testing? Thanks!

[QuncCccccc]

@QuncCccccc Can you please also check why this is failing Google Testing? Thanks!

For this one, it failed several familylink tests and the exception message shows test failed on this assert:

flutter/packages/flutter_test/lib/src/binding.dart

Line 1527 in f4ee956

assert(!timersPending, 'A Timer is still pending even after the widget tree was disposed.');

Same exception message as the PR 143443

[TahaTesser]

@QuncCccccc Can you please also check why this is failing Google Testing? Thanks!

For this one, it failed several familylink tests and the exception message shows test failed on this assert:

flutter/packages/flutter_test/lib/src/binding.dart

Line 1527 in f4ee956

assert(!timersPending, 'A Timer is still pending even after the widget tree was disposed.');

Same exception message as the PR 143443

Future.delayed seems to have cause this issue so I've replaced it with Timer and tests are green.

Can you please review the changes and approve if it looks good.

[QuncCccccc]

LGTM:)