[Bug report] The provided ScrollController is currently attached to more than one ScrollPosition.

[MichalNemec]

Version

6.0.0

Platforms

macOS, Web, Windows

Device Model

Macbook air m1 2020

flutter info

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• No issues found!

How to reproduce?

Make nestedscrollview with controller make tabs keep alive content of tabs is customscrollview see errors when hovering over scrollbar.

Logs

Error: 'The provided ScrollController is currently attached to more than one ScrollPosition.
The Scrollbar requires a single ScrollPosition in order to be painted.
When the scrollbar is interactive, the associated ScrollController must only have one ScrollPosition attached.The provided ScrollController must be unique to one ScrollView widget.' has been skipped to due to duplication occurence within 3000 ms.

Example code (optional)

TabBar get _tabBar => TabBar(
        controller: _tabController,
        tabs: const [
          Tab(
            text: 'foo',
          ),
          Tab(
            text: 'bar',
          ),
        ],
      );

ExtendedNestedScrollView(
            physics: AlwaysScrollablePhysics(),
            floatHeaderSlivers: true,
            onlyOneScrollInBody: true,
            controller: scrollController,
            headerSliverBuilder: (BuildContext context, bool innerBoxIsScrolled) {
              return <Widget>[
                  SliverAppBar(
                    title: Text('title'),
                  ),
                SliverAppBar(
                  pinned: true,
                  bottom: PreferredSize(
                    preferredSize: const Size.fromHeight(50 + 40),
                    child: Column(
                      children: [
                        Padding(
                          padding: const EdgeInsets.symmetric(horizontal: 16.0, vertical: 4),
                          child: TextField(
                            decoration: InputDecoration(
                              hintText: 'search',
                            ),
                          ),
                        ),
                        _tabBar,
                      ],
                    ),
                  ),
                ),
              ];
            },
            body: TabBarView(
              controller: _tabController,
              physics: const NeverScrollableScrollPhysics(),
              children: const [
                Tab1(),
                Tab2(),
              ],
            ),
          ),


class Tab1 extends ConsumerStatefulWidget {
  const Tab1({super.key});

  @override
  State<Tab1> createState() => _Tab1State();
}

class _FollowingTabState extends State<Tab1> with AutomaticKeepAliveClientMixin<Tab1> {
  bool _shouldKeepAlive = true;

  @override
  bool get wantKeepAlive => _shouldKeepAlive;

  @override
  void dispose() {
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    super.build(context);
    return CustomScrollView(
      physics: scrollingPhysics(),
      slivers: [
        SliverList(
          delegate: SliverChildBuilderDelegate(
            (context, index) {
              return ListTile(
                leading: Container(
                  padding: const EdgeInsets.all(8),
                  width: 100,
                  color: Colors.red,
                  child: const Placeholder(),
                ),
                title: Text('tab1 ${index + 1}', textScaleFactor: 2),
              );
            },
            childCount: 50,
          ),
        ),
      ],
    );
  }
}

class Tab2 extends ConsumerStatefulWidget {
  const Tab2({super.key});

  @override
  State<Tab2> createState() => _Tab2State();
}

class _FollowingTabState extends State<Tab2> with AutomaticKeepAliveClientMixin<Tab2> {
  bool _shouldKeepAlive = true;

  @override
  bool get wantKeepAlive => _shouldKeepAlive;

  @override
  void dispose() {
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    super.build(context);
    return CustomScrollView(
      physics: scrollingPhysics(),
      slivers: [
        SliverList(
          delegate: SliverChildBuilderDelegate(
            (context, index) {
              return ListTile(
                leading: Container(
                  padding: const EdgeInsets.all(8),
                  width: 100,
                  color: Colors.red,
                  child: const Placeholder(),
                ),
                title: Text('tab2 ${index + 1}', textScaleFactor: 2),
              );
            },
            childCount: 50,
          ),
        ),
      ],
    );
  }
}

How to create Nested scrollview with kept alive tabs and have scrollbar there in any way that it just works?