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fixes [Secondary `TabBar` indicator height token is missing ](https://github.com/flutter/flutter/issues/124965) ### Code sample <details> <summary>expand to view the code sample</summary> ```dart import 'package:flutter/material.dart'; void main() => runApp(const MyApp()); class MyApp extends StatelessWidget { const MyApp({super.key}); @override Widget build(BuildContext context) { return MaterialApp( debugShowCheckedModeBanner: false, home: DefaultTabController( length: 2, child: Scaffold( appBar: AppBar( title: const Text('Sample'), bottom: const TabBar.secondary( tabs: <Widget>[ Tab(icon: Icon(Icons.directions_car)), Tab(icon: Icon(Icons.directions_transit)), ], ), ), floatingActionButton: FloatingActionButton( onPressed: () {}, child: const Icon(Icons.add), ), ), ), ); } } ``` </details>
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