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<!-- Thanks for filing a pull request! Reviewers are typically assigned within a week of filing a request. To learn more about code review, see our documentation on Tree Hygiene: https://github.com/flutter/flutter/blob/main/docs/contributing/Tree-hygiene.md --> Fix: #176362 Issue provided reproducible code related to exception being thrown when removing all items in an `AnimatedList` when some of the item were already being removed but had a long animation duration. In this PR: The `removeAllItems` method now correctly calculates the range of items to remove, excluding those already undergoing a removal animation. This prevents an assert from triggering when `removeAllItems` is called while other items are still being removed. <details open> <summary> Video example after fix </summary> https://github.com/user-attachments/assets/c7351702-b829-4e35-9978-b95f9f3ae8cd </details> <details open> <summary> Updated reproducible code </summary> ``` import 'package:flutter/material.dart'; void main() => runApp(const MyApp()); class MyApp extends StatelessWidget { const MyApp({super.key}); @override Widget build(BuildContext context) { return const MaterialApp(debugShowCheckedModeBanner: false, home: AnimatedListExample()); } } class AnimatedListExample extends StatefulWidget { const AnimatedListExample({super.key}); @override State<AnimatedListExample> createState() => _AnimatedListExampleState(); } class _AnimatedListExampleState extends State<AnimatedListExample> { final GlobalKey<AnimatedListState> _listKey = GlobalKey<AnimatedListState>(); final List<int> _items = List<int>.generate(10, (int index) => index); void _removeItem(int index) { final int removedItem = _items[index]; _listKey.currentState?.removeItem( index, (BuildContext context, Animation<double> animation) => SizeTransition( sizeFactor: animation, child: _buildItem(removedItem, animation, isRemoved: true), ), // 👇 Long delay so you can press "Remove All" while it’s still animating duration: const Duration(seconds: 10), ); _items.removeAt(index); } void _addItem() { final int addingItem = _items.length; _listKey.currentState?.insertItem(addingItem, duration: const Duration(seconds: 3)); _items.add(addingItem); } void _removeAll() { _listKey.currentState?.removeAllItems((BuildContext context, Animation<double> animation) { return SizeTransition( sizeFactor: animation, child: Container( color: Colors.red[100], child: const ListTile(title: Text('Removing...')), ), ); }, duration: const Duration(seconds: 2)); _items.clear(); } Widget _buildItem(int item, Animation<double> animation, {bool isRemoved = false}) { return SizeTransition( sizeFactor: animation, child: Card( margin: const EdgeInsets.symmetric(vertical: 4, horizontal: 8), child: ListTile( title: Text('Item $item'), trailing: !isRemoved ? IconButton( icon: const Icon(Icons.delete, color: Colors.red), onPressed: () { final int index = _items.indexOf(item); if (index != -1) { _removeItem(index); } }, ) : null, ), ), ); } @override Widget build(BuildContext context) { return Scaffold( appBar: AppBar( title: const Text('AnimatedList Example'), actions: <Widget>[ TextButton(onPressed: _addItem, child: const Text('Add')), TextButton( onPressed: _items.isNotEmpty ? _removeAll : null, child: const Text('Clear list'), ), ], ), body: AnimatedList( key: _listKey, initialItemCount: _items.length, itemBuilder: (BuildContext context, int index, Animation<double> animation) { return _buildItem(_items[index], animation); }, ), ); } } ``` </details> ## Pre-launch Checklist - [x] I read the [Contributor Guide] and followed the process outlined there for submitting PRs. - [x] I read the [Tree Hygiene] wiki page, which explains my responsibilities. - [x] I read and followed the [Flutter Style Guide], including [Features we expect every widget to implement]. - [x] I signed the [CLA]. - [x] I listed at least one issue that this PR fixes in the description above. - [x] 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]. **Note**: The Flutter team is currently trialing the use of [Gemini Code Assist for GitHub](https://developers.google.com/gemini-code-assist/docs/review-github-code). Comments from the `gemini-code-assist` bot should not be taken as authoritative feedback from the Flutter team. If you find its comments useful you can update your code accordingly, but if you are unsure or disagree with the feedback, please feel free to wait for a Flutter team member's review for guidance on which automated comments should be addressed. <!-- Links --> [Contributor Guide]: https://github.com/flutter/flutter/blob/main/docs/contributing/Tree-hygiene.md#overview [Tree Hygiene]: https://github.com/flutter/flutter/blob/main/docs/contributing/Tree-hygiene.md [test-exempt]: https://github.com/flutter/flutter/blob/main/docs/contributing/Tree-hygiene.md#tests [Flutter Style Guide]: https://github.com/flutter/flutter/blob/main/docs/contributing/Style-guide-for-Flutter-repo.md [Features we expect every widget to implement]: https://github.com/flutter/flutter/blob/main/docs/contributing/Style-guide-for-Flutter-repo.md#features-we-expect-every-widget-to-implement [CLA]: https://cla.developers.google.com/ [flutter/tests]: https://github.com/flutter/tests [breaking change policy]: https://github.com/flutter/flutter/blob/main/docs/contributing/Tree-hygiene.md#handling-breaking-changes [Discord]: https://github.com/flutter/flutter/blob/main/docs/contributing/Chat.md [Data Driven Fixes]: https://github.com/flutter/flutter/blob/main/docs/contributing/Data-driven-Fixes.md --------- Co-authored-by: chunhtai <47866232+chunhtai@users.noreply.github.com>