Flutter 使小部件处于有状态状态会导致hasSize异常

下面的页面小部件抛出异常 运行'package:flutter/src/rendering/box. dart': box.dart:1 断言失败:第1965行位置12:'hasSize'

相关的导致错误的小部件是 脚手架

断言失败:1965行位置12:‘hasSize’

相关的导致错误的小部件是 FittedBox`

但是，一旦我使小部件变得无状态或删除FittedBox小部件，运行时错误就消失了.

class MyPage extends StatefulWidget {
  const MyPage({super.key});

  @override
  State<MyPage> createState() => _MyPageState();
}

class _MyPageState extends State<MyPage> {
  String _result = '';

  @override
  Widget build(BuildContext context) {
    Widget result = FittedBox(
      child: Text(_result),
    );

    Widget actionButton = ElevatedButton(
      onPressed: () {
        setState(() {
          _result = 'Text generated';
        });
      },
      child: const Text('Press me'),
    );

    Widget bottom = Container(
      height: 80,
      color: Colors.orange,
      alignment: Alignment.center,
      child: const Text("Footer"),
    );

    return Scaffold(
      appBar: AppBar(
        backgroundColor: Theme.of(context).colorScheme.inversePrimary,
        title: const Text('My App'),
      ),
      body: Padding(
        padding: const EdgeInsets.only(top: 20),
        child: Column(
          crossAxisAlignment: CrossAxisAlignment.end,
          children: [
            const Flexible(
              flex: 15,
              child: TextField(),
            ),
            Expanded(
              flex: 10,
              child: result,
            ),
            Container(
              height: 50,
              child: Text('Somre data'),
            ),
            const Expanded(
              flex: 56,
              child: Text('Some content'),
            ),
            bottom,
          ],
        ),
      ),
    );
  }
}

我遇到了一种情况，输出结果可以长达30个字符.我希望结果内容显示在一行和最大尺寸，同时遵循Flex属性指定的约束.