[Accessibility] SliverResizingHeader captures semantic focus before list is fully scrolled #179687
Description
Links
This issue is similar to #179022 and will be fixed once PR #179023 is merged.
FYI @Renzo-Olivares .
Steps to reproduce
- Enable accessibility services (TalkBack or VoiceOver) on the device.
- Open a screen containing a
CustomScrollViewwith aSliverResizingHeaderand a list of items (e.g., SliverList). - Scroll down the list so that the top items are off-screen.
- Navigate backwards (swipe left / previous item gesture) to scroll up toward the top of the list.
Expected results
The list should be fully scrolled to the top (displaying the very first item) before the semantic focus moves to the widget preceding the list or the pinned header. The user should be able to navigate through all remaining list items before leaving the list context.
Actual results
The PinnedHeaderSliver takes the semantic focus immediately when navigating up, effectively "skipping" the remaining items at the top of the list or preventing the list from scrolling all the way back to the start.
Code sample
Code sample
import 'package:flutter/material.dart';
void main() => runApp(const MaterialApp(home: MyApp()));
class MyApp extends StatelessWidget {
const MyApp({super.key});
@override
Widget build(BuildContext context) {
return Scaffold(
body: CustomScrollView(
slivers: <Widget>[
const SliverAppBar(
pinned: true,
expandedHeight: 100.0,
title: Text('Sample App'),
backgroundColor: Colors.blue,
),
const SliverResizingHeader(
minExtentPrototype: SizedBox(height: 50),
maxExtentPrototype: SizedBox(height: 150),
child: ColoredBox(
color: Colors.green,
child: ListTile(title: Text('Resizable Header')),
),
),
// The List
SliverList(
delegate: SliverChildBuilderDelegate((BuildContext context, int index) {
return ListTile(title: Text('Item $index'), subtitle: const Text('Scroll down then navigate back up'));
}, childCount: 50),
),
],
),
);
}
}Screenshots or Video
Screenshots / Video demonstration
sliver_resizing_header.mp4
Flutter Doctor output
Doctor output
[✓] Flutter (Channel master, 3.40.0-1.0.pre-105, on macOS 15.7.2 24G325 darwin-arm64, locale fr-FR) [4,7s]
• Flutter version 3.40.0-1.0.pre-105 on channel master at /Users/emmanuel_lefebvre/fvm/versions/master
• Upstream repository https://github.com/flutter/flutter.git
• Framework revision 6519f99911 (10 hours ago), 2025-12-10 00:18:27 -0500
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• Platform android-36, build-tools 35.0.1
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• Chrome (web) • chrome • web-javascript • Google Chrome 143.0.7499.41
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