Flutter Web：堆栈和耀斑问题

我试图在 Flutter Web（开发频道 - v1.13.2）上创建一个简单的网页，但出现了这个奇怪的问题。当我尝试在堆栈小部件中放置耀斑动画时，该堆栈小部件分别有 2 个附加小部件、一个背景和一个居中文本，耀斑似乎没有出现。但是当我移除背景容器时，耀斑可以正常工作并且位置完美。这是代码；

    import 'package:flutter/material.dart';
    import "package:flare_flutter/flare_actor.dart";

    void main() => runApp(MyApp());

    class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(
        primarySwatch: Colors.green,
      ),
      home: MyHomePage(title: 'Flutter Demo Home Page'),
    );
  }
}

class MyHomePage extends StatefulWidget {
  MyHomePage({Key key, this.title}) : super(key: key);

  final String title;

  @override
  _MyHomePageState createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  @override
  Widget build(BuildContext context) {
    return new Scaffold(
      body: new Stack(
        children: <Widget>[
          new Container(
            decoration: new BoxDecoration(
                image: new DecorationImage(
                    image: new AssetImage('images/bckg.jpeg'),
                    fit: BoxFit.cover)),
          ),
          new Center(
            child: new Text('TEST',
                style: new TextStyle(
                    color: Colors.white,
                    fontSize: 200.0,
                    fontWeight: FontWeight.bold,
                    letterSpacing: 5.0)),
          ),
          new Align(
            alignment: Alignment.bottomCenter,
            child: new ConstrainedBox(
              constraints: new BoxConstraints(
                maxHeight: 100,
                maxWidth: 100,
              ),
              child: new FlareActor("images/arrowdown.flr",
                  color: Colors.white,
                  alignment: Alignment.center,
                  fit: BoxFit.contain,
                  animation: "idle"),
            ),
          )
        ],
      ),
    );
  }
}

我想你正在看到this bug https://github.com/flutter/flutter/issues/44845。看看是否RepaintBoundary同时，解决方法对您有用。