Disabling and then enabling scrolling prevents the viewport from expanding

[khoadng]

Video

Screen.Recording.2023-04-18.at.20.20.47.mov

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

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

  @override
  State<SimpleExample> createState() => _SimpleExampleState();
}

class _SimpleExampleState extends State<SimpleExample> {
  var enableScroll = true;
  var expanded = false;

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
          title: Text(enableScroll ? "Scrolling Enable" : "Scrolling Disable")),
      floatingActionButton: FloatingActionButton(
        onPressed: () => setState(() => enableScroll = !enableScroll),
        child: Icon(Icons.add),
      ),
      bottomSheet: BottomSheet(
        onClosing: () {},
        builder: (context) => Container(
          height: 80,
          child: AppBar(title: Text(expanded ? "Expanded" : "Shrunk")),
        ),
      ),
      body: ExprollablePageView(
        physics: enableScroll ? null : NeverScrollableScrollPhysics(),
        onViewportChanged: (metrics) =>
            setState(() => expanded = metrics.isExpanded),
        itemCount: 5,
        itemBuilder: (context, page) {
          return ListView.builder(
            physics: enableScroll ? null : NeverScrollableScrollPhysics(),
            itemCount: 100,
            controller: PageContentScrollController.of(context),
            itemBuilder: (context, index) =>
                ListTile(title: Text(index.toString())),
          );
        },
      ),
    );
  }
}