The 'checkerboardRasterCacheImages' of 'MaterialApp' not working on master channel #106946
Description
The code below should show the chessboard when running, but it doesn't now.
import 'package:flutter/material.dart';
void main() {
runApp(const MaterialApp(
checkerboardRasterCacheImages: true,
home: Scaffold(
body: Example(),
),
));
}
class Example extends StatefulWidget {
const Example({Key? key}) : super(key: key);
@override
State<Example> createState() => _ExampleState();
}
class _ExampleState extends State<Example> with TickerProviderStateMixin {
late final AnimationController _controller = AnimationController(vsync: this, duration: const Duration(seconds: 1));
late final Animation<Offset> _position = _controller.drive(
Tween(begin: const Offset(0.0, 0.0), end: const Offset(1, 1.0)));
@override
void initState() {
super.initState();
_controller.reset();
_controller.forward();
_controller.addStatusListener((status) {
if (status == AnimationStatus.completed) {
_controller.reset();
_controller.forward();
}
});
}
@override
Widget build(BuildContext context) {
return Column(
children: <Widget>[
Container(height: 100),
SlideTransition(
position: _position,
child: Opacity(
opacity: 0.9,
child: Container(
child: Column(
children: <Widget>[
Container(
width: 200,
height: 200,
color: Colors.red,
child: const Text('A'),
),
],
),
),
),
),
],
);
}
}The reason is that this line of code uses the wrong field.
https://github.com/flutter/engine/blob/main/flow/layers/layer_raster_cache_item.cc#L155
Here is the patch for it flutter/engine#34424
cc @flar @JsouLiang
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