96e02c61dc
fixes [`PopupMenuItem` adds redundant padding when using `ListItem`](https://github.com/flutter/flutter/issues/128553) ### Description - Fixed redundant `ListTile` padding when using `CheckedPopupMenuItem` or `PopupMenuItem` with the `ListTile` child for complex popup menu items as suggested in the docs. - Updated default horizontal padding for popup menu items. ### Code sample <details> <summary>expand to view the code sample</summary> ```dart 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), ), ), ], ), ), ), ), ); } } ``` </details> ### Before  - Default horizontal padding is the same as M2 (16.0), while the specs use a smaller value (12.0) - `ListTile` nested by default in `CheckedPopupMenuItem` has redundant padding - `PopupMenuItem` using `ListTile` as a child for complex menu items contains redundant padding.  ### After - Default horizontal padding is updated for Material 3. - `PopupMenuItem` & `CheckedPopupMenuItem` override `ListTile` padding (similar to how `ExpansionTile` overrides `ListTile` text and icon color. 
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