Reverse CustomScrollview inside a NestedScrollView does scroll in the wrong direction

[KorbinianMossandl]

Steps to Reproduce

I did create a NestedScrollView with a SliverAppBar and a Tabview that consists of CustomScrollViews which are set to reverse = true. Everything works and looks as expected, except that the CustomScorllViews scroll in the opposite direction of the drag/swipe. The SliverAppBar is scrolling correctly. In other words the SliverAppBar and the CustomScrollViews do scroll in different directions.

Please consider this code snippet to reproduce the issue:

    return Scaffold(
      body: NestedScrollView(
        reverse: false,
        headerSliverBuilder: (BuildContext context, bool innerBoxIsScrolled) {
          return <Widget>[
            SliverOverlapAbsorber(
              handle: NestedScrollView.sliverOverlapAbsorberHandleFor(context),
              child: SliverAppBar(
                pinned: true,
                expandedHeight: 80,
                forceElevated: innerBoxIsScrolled,
                flexibleSpace: LayoutBuilder(builder:
                    (BuildContext context, BoxConstraints constraints) {
                  return FlexibleSpaceBar(
                    title: Text("Test"),
                  );
                }),
              ),
            ),
          ];
        },
        body: DefaultTabController(
          length: 3,
          child: TabBarView(
            children: [1, 2, 3].map((int index) {
              return SafeArea(
                top: false,
                bottom: false,
                child: Builder(
                  builder: (BuildContext context) {
                    return CustomScrollView(
                      reverse: true,
                      key: PageStorageKey<String>(index.toString()),
                      slivers: <Widget>[
                        SliverOverlapInjector(
                          handle:
                              NestedScrollView.sliverOverlapAbsorberHandleFor(
                                  context),
                        ),
                        SliverList(
                          delegate: SliverChildBuilderDelegate(
                            (BuildContext context, int index) {
                              return ListTile(title: Text("Item $index"));
                            },
                          ),
                        ),
                      ],
                    );
                  },
                ),
              );
            }).toList(),
          ),
        ),
      ),
    );

This bug also exists in the original NestedScrollView, but since google seems to ignore those issues i was hoping you could solve this problem in your extension?

[zmtzawqlp]

please tell your purpose to set reverse

[ManojMMWWIndia]

You may need to use it in chatting scenario. Where you want to show recent chat text at the bottom.