当按下页面或操作按钮可用时，Flutter Appbar标题不居中

AppBar(
  title: Text('My App', style: TextStyle(fontSize: 20)),
  centerTitle: true, // 确保这一行代码存在
)

AppBar(
  title: Text('Very Long Title That Causes Alignment Issues', overflow: TextOverflow.ellipsis),
  centerTitle: true,
)

AppBar(
  title: PreferredSize(
    preferredSize: Size.fromHeight(kToolbarHeight),
    child: Center(child: Text('My App')),
  ),
)

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('My App', style: TextStyle(fontSize: 20)),
          centerTitle: true,
        ),
        body: Center(child: Text('Hello World')),
      ),
    );
  }
}