问AnimatedContainer对于不同的孩子的表现不同

EN

bool _value = true;

@override
Widget build(BuildContext context) {
  var flutterLogo = FlutterLogo(size: _value ? 400 : 200, colors: Colors.blue,);
  var container = Container(height: _value ? 400 : 200, color: Colors.blue,);

  return Scaffold(
    floatingActionButton: FloatingActionButton(
      onPressed: () => setState(() => _value = !_value),
    ),
    body: AnimatedContainer(
      duration: Duration(milliseconds: 1000),
      child: container, // putting flutterLogo here works fine
    ),
  );
}