Fix PopupMenuItem & CheckedPopupMenuItem has redundant ListTile padding and update default horizontal padding for Material 3 - #131609

import 'package:flutter/material.dart';

/// Flutter code sample for [PopupMenuButton].

// This is the type used by the popup menu below.
enum SampleItem { itemOne, itemTwo, itemThree }

void main() => runApp(const PopupMenuApp());

class PopupMenuApp extends StatelessWidget {
  const PopupMenuApp({super.key});

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      theme: ThemeData(useMaterial3: true),
      home: const PopupMenuExample(),
    );
  }
}

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

  @override
  State<PopupMenuExample> createState() => _PopupMenuExampleState();
}

class _PopupMenuExampleState extends State<PopupMenuExample> {
  SampleItem? selectedMenu;

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(title: const Text('PopupMenuButton')),
      body: Center(
        child: SizedBox(
          width: 150,
          height: 100,
          child: Align(
            alignment: Alignment.topLeft,
            child: PopupMenuButton<SampleItem>(
              initialValue: selectedMenu,
              // Callback that sets the selected popup menu item.
              onSelected: (SampleItem item) {
                setState(() {
                  selectedMenu = item;
                });
              },
              itemBuilder: (BuildContext context) =>
                  <PopupMenuEntry<SampleItem>>[
                const PopupMenuItem<SampleItem>(
                  value: SampleItem.itemOne,
                  child: Text('PopupMenuItem'),
                ),
                const CheckedPopupMenuItem<SampleItem>(
                  checked: true,
                  value: SampleItem.itemTwo,
                  child: Text('CheckedPopupMenuItem'),
                ),
                const PopupMenuItem<SampleItem>(
                  value: SampleItem.itemOne,
                  child: ListTile(
                    leading: Icon(Icons.cloud),
                    title: Text('ListTile'),
                    contentPadding: EdgeInsets.zero,
                    trailing: Icon(Icons.arrow_right_rounded),
                  ),
                ),
              ],
            ),
          ),
        ),
      ),
    );
  }
}