水平模式下的颤动ButtonBar似乎不尊重MainAxisSize

import 'package:flutter/material.dart';

void main() {
  runApp(MyApp());
}

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(title: Text('ButtonBar Example')),
        body: Center(
          child: ButtonBar(
            mainAxisSize: MainAxisSize.max,
            children: [
              ElevatedButton(onPressed: () {}, child: Text('Button 1')),
              ElevatedButton(onPressed: () {}, child: Text('Button 2')),
              ElevatedButton(onPressed: () {}, child: Text('Button 3')),
            ],
          ),
        ),
      ),
    );
  }
}

import 'package:flutter/material.dart';

void main() {
  runApp(MyApp());
}

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(title: Text('ButtonBar Example')),
        body: Center(
          child: Flex(
            mainAxisSize: MainAxisSize.max,
            direction: Axis.horizontal,
            children: [
              ButtonBar(
                mainAxisSize: MainAxisSize.max,
                children: [
                  ElevatedButton(onPressed: () {}, child: Text('Button 1')),
                  ElevatedButton(onPressed: () {}, child: Text('Button 2')),
                  ElevatedButton(onPressed: () {}, child: Text('Button 3')),
                ],
              ),
            ],
          ),
        ),
      ),
    );
  }
}