[Accessibility] PinnedHeaderSliver captures semantic focus before list is fully scrolled #179022
Description
Steps to reproduce
- Enable accessibility services (TalkBack or VoiceOver) on the device.
- Open a screen containing a CustomScrollView with a PinnedHeaderSliver and 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: AccessibilityTestPage()));
}
class AccessibilityTestPage extends StatelessWidget {
const AccessibilityTestPage({super.key});
@override
Widget build(BuildContext context) {
return Scaffold(
body: CustomScrollView(
slivers: <Widget>[
const SliverAppBar(
pinned: true,
expandedHeight: 100.0,
title: Text('Pinned Semantic Focus'),
backgroundColor: Colors.blue,
),
// The Pinned Header
const PinnedHeaderSliver(
child: ColoredBox(
color: Colors.amber,
child: ListTile(title: Text('Pinned Semantic Focus')),
),
),
// 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),
),
],
),
);
}
}demo.mp4
Screenshots or Video
Screenshots / Video demonstration
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Logs
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Flutter Doctor output
Doctor output
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