如何强制TabBarView采用最小高度以适应其内容？

import 'package:flutter/material.dart';

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

class TabBarDemo extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: DefaultTabController(
        length: 3,
        child: Scaffold(
          appBar: AppBar(
            bottom: TabBar(
              tabs: [
                Tab(icon: Icon(Icons.directions_car)),
                Tab(icon: Icon(Icons.directions_transit)),
                Tab(icon: Icon(Icons.directions_bike)),
              ],
            ),
            title: Text('Tabs Demo'),
          ),
          body: Column(children: [
            Text('Header Widget'),
            Expanded(
              child: TabBarView(
                children: [
                  Column(
                    mainAxisSize: MainAxisSize.min,
                    children: [
                      Icon(Icons.directions_car),
                      Icon(Icons.directions_car),
                    ],
                  ),
                  Icon(Icons.directions_transit),
                  Icon(Icons.directions_bike),
                ],
              ),
            ),
            Text('Footer Widget')
          ]),
        ),
      ),
    );
  }
}