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[Android][a11y] TalkBack double-scrolls and skips items when the focused node scrolls into cacheExtent #194260
Description
Steps to reproduce
- Run the code sample below on an Android device or emulator with TalkBack enabled.
- Swipe right through
Item 0,Item 1,Item 2, andItem 3(the last visible item on screen). - Swipe right once more on
Item 3to trigger a scroll.
Expected results
The list scrolls once and TalkBack moves focus to Item 4.
Actual results
The list scrolls twice in a row and TalkBack jumps from Item 3 straight to Item 7, skipping Item 4, Item 5, and Item 6.
May be related to #173080
Code sample
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(
home: Scaffold(
body: SafeArea(
child: LayoutBuilder(
builder: (BuildContext context, BoxConstraints constraints) {
final double itemHeight = constraints.maxHeight * 0.25;
return CustomScrollView(
slivers: <Widget>[
SliverList.builder(
itemCount: 80,
itemBuilder: (BuildContext context, int index) {
return Container(
height: itemHeight,
alignment: Alignment.topLeft,
padding: const EdgeInsets.all(16),
child: Semantics(
container: true,
child: Text('Item $index'),
),
);
},
),
],
);
},
),
),
),
);
}
}
Activity
puneetkukreja98 commentedon Oct 13, 2026
@LouiseHsu Thanks for reporting this issue. I tested this on the latest stable and master on a physical Pixel 10 running Android 17, but was unable to reproduce the behavior. Could you please share your flutter doctor -v output along with your Android device version details?
Video:
screen-20261013-135300-1791879752872.mp4.2.mp4
flutter doctor -v stable:
flutter doctor -v master:
LouiseHsu commentedon Oct 13, 2026
this bug seems to happen exclusively when each element takes up more than 20-25% of the viewport, and my emulator was a smaller pixel 7. Ive updated the test code to be relative to device viewport. please try again!
puneetkukreja98 commentedon Oct 14, 2026
@LouiseHsu Thanks for updating the code sample. However, I am still unable to reproduce the issue on both master and stable.
@saurabh-mirajkar could you please test this once on your physical pixel 7?
saurabh-mirajkar commentedon Oct 14, 2026
I'm unable to reproduce the behaviour on either a Pixel 7 emulator or a physical Pixel 6 using the supplied code sample and reproduction video with the latest stable release.
stable
emulator-pixel-7.webm
physical-pixel-6.mp4
LouiseHsu commentedon Oct 15, 2026
Ugh sorry one more time. I was trying to clean up the repro code, but I think just having the entire code snippet is worth it. Please try again :) I tested this on a Pixel 7.
2 remaining items
mboetger commentedon Oct 20, 2026
Assigning to @LouiseHsu since #194411 has been posted.
[Android][a11y] Set visibleToUser=false for hidden semantics nodes (f…
[Android][a11y] Set visibleToUser=false for hidden semantics nodes (f…
github-actions commentedon Nov 10, 2026
This thread has been automatically locked since there has not been any recent activity after it was closed. If you are still experiencing a similar issue, please open a new bug, including the output of
flutter doctor -vand a minimal reproduction of the issue.