带制表符的Flutter表单导航--切换表单字段时如何避免不需要的空格

import 'package:flutter/material.dart';

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

class MyApp extends StatelessWidget {
  final List<Tab> myTabs = <Tab>[
    Tab(text: 'Tab 1'),
    Tab(text: 'Tab 2'),
    Tab(text: 'Tab 3'),
  ];

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: DefaultTabController(
        length: myTabs.length,
        child: Scaffold(
          appBar: AppBar(
            bottom: TabBar(
              tabs: myTabs,
            ),
          ),
          body: TabBarView(
            children: myTabs.map((Tab tab) {
              return Center(child: Text(tab.text));
            }).toList(),
          ),
        ),
      ),
    );
  }
}

import 'package:flutter/material.dart';

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

class MyApp extends StatelessWidget {
  final List<Tab> myTabs = <Tab>[
    Tab(text: 'Tab 1'),
    Tab(text: 'Tab 2'),
    Tab(text: 'Tab 3'),
  ];

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: DefaultTabController(
        length: myTabs.length,
        child: Scaffold(
          appBar: AppBar(
            bottom: TabBar(
              tabs: myTabs,
            ),
          ),
          body: TabBarView(
            children: myTabs.map((Tab tab) {
              return Center(
                child: TextFormField(
                  focusNode: FocusNode(),
                  decoration: InputDecoration(
                    labelText: tab.text,
                  ),
                ),
              );
            }).toList(),
          ),
        ),
      ),
    );
  }
}