[SliverAppBar][Semantics] Voice over gets stuck when sliver app bar is collapsed. #60331
Description
Internal: b/158621034
When you have an app with a SliverAppBar and a SliverList body, and you're using voiceover on iOS, scrolling to the bottom of the list and then back up will get the voice over stuck in the status bar.
Additionally, an extra "Heading" node seems to be added.
Steps to Reproduce
Using the following example app:
import 'package:flutter/material.dart';
void main() {
runApp(Demo());
}
class Demo extends StatelessWidget {
@override
Widget build(BuildContext context) {
return MaterialApp(
home: Scaffold(
body: CustomScrollView(
slivers: [
SliverAppBar(
pinned: true,
expandedHeight: 200,
flexibleSpace: Container(height: 100),
),
SliverList(
delegate: SliverChildListDelegate([
for (var i = 0; i < 50; i ++)
Text('This is text. ' * 45),
]),
),
],
),
),
);
}
}- Open the above app with voiceover enabled on an iOS device.
- Swipe to the right to navigate to the very bottom of the list.
- Swipe back up to the header, while it is still collapsed.
- Notice that the voice over tool gets stuck in the status bar, even when you swipe left and right, you can not get back to the page.
Expected results:
Swiping left to navigate back up the list will put you back in AppBar.
Actual results:
Voice Over gets stuck in the status bar, back button, nor text in list, can not be navigated to.
Video of bug (error state begins at the ~8 second mark):
https://photos.app.goo.gl/bYAsCBz4ixdZmCcg9
Flutter Doctor
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