Webview_flutter canGoBack problem in Separate Window about flutter HOT 6 CLOSED

import 'package:flutter/material.dart';
import 'package:webview_flutter/webview_flutter.dart';

void main() {
  runApp(const MaterialApp(home: TabsView()));
}

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

  @override
  _TabsViewState createState() => _TabsViewState();
}

class _TabsViewState extends State<TabsView> {
  int _currentIndex = 0;
  int tabIndex = 0;

  void onTabTapped(int index) {
    setState(() {
      _currentIndex = index;
    });
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: Stack(
        ///  Added Stack Widget
        children: [
          Offstage(
            offstage: _currentIndex != 0,
            child: const First(),
          ),
          Offstage(
            offstage: _currentIndex != 1,
            child: const Second(),
          ),
        ],
      ),
      bottomNavigationBar: BottomNavigationBar(
        type: BottomNavigationBarType.fixed,
        selectedItemColor: Colors.deepOrange[800],
        backgroundColor: Colors.grey[300],
        unselectedItemColor: Colors.grey[800],
        currentIndex: _currentIndex,
        onTap: onTabTapped,
        items: const [
          BottomNavigationBarItem(
            icon: Icon(Icons.home),
            label: 'Webview 1',
          ),
          BottomNavigationBarItem(
            icon: Icon(Icons.web),
            label: 'Webview 2',
          ),
        ],
      ),
    );
  }
}

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

  @override
  State<First> createState() => _FirstState();
}

class _FirstState extends State<First> {
  late final WebViewController _controller1;

  @override
  void initState() {
    super.initState();

    _controller1 = WebViewController()
      ..setJavaScriptMode(JavaScriptMode.unrestricted)
      ..loadRequest(Uri.parse('https://stackoverflow.com'));
  }

  Future<bool> _goBackCall1(BuildContext context) async {
    if (await _controller1.canGoBack()) {
      _controller1.goBack();
      return Future.value(false);
    } else {
      // SystemNavigator.pop();
      return Future.value(true);
    }
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: const Text("Flutter WebView1"),
      ),
      body: PopScope(
        canPop: false,
        onPopInvoked: (bool didPop) {
          if (didPop) {
            print('didPop call: $didPop');
            return;
          }
          _goBackCall1(context);
        },
        child: SafeArea(
          child: Stack(
            children: [
              WebViewWidget(controller: _controller1),
            ],
          ),
        ),
      ),
    );
  }
}

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

  @override
  State<Second> createState() => _SecondState();
}

class _SecondState extends State<Second> {
  late final WebViewController _controller2;

  @override
  void initState() {
    super.initState();

    _controller2 = WebViewController()
      ..setJavaScriptMode(JavaScriptMode.unrestricted)
      ..loadRequest(Uri.parse('https://google.com'));
  }

  Future<bool> _goBackCall2(BuildContext context) async {
    if (await _controller2.canGoBack()) {
      _controller2.goBack();
      return Future.value(false);
    } else {
      // SystemNavigator.pop();
      return Future.value(true);
    }
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: const Text("Flutter WebView2"),
      ),      
      body: PopScope(
        canPop: false,
        onPopInvoked: (bool didPop) {
          if (didPop) {
            print('didPop call: $didPop');
            return;
          }
          _goBackCall2(context);
        },
        child: SafeArea(
          child: Stack(
            children: [
              WebViewWidget(controller: _controller2),
            ],
          ),
        ),
      ),
    );
  }
}