How to make SliverAppBar overgrow inside NestedScrollView in Flutter? - flutter

Question

I am using a NestedScrollView with a SliverAppBar and a TabBar. The scrolling works well when scrolling down scrollable content like ListView or SingleChildScrollView, but whenever I try to scroll up and get the SliverAppBar to overgrow, nothing happens.
In the SliverPersistentHeaderDelegate of the SliverAppBar I am overwriting the following method like so:
#override
OverScrollHeaderStretchConfiguration get stretchConfiguration =>
OverScrollHeaderStretchConfiguration();
This is the class of the screen I am talking about:
class ProfileScreen extends ConsumerStatefulWidget {
const ProfileScreen({
super.key,
required this.userId
});
final String userId;
#override
ConsumerState<ProfileScreen> createState() => _ProfileScreenState();
}
class _ProfileScreenState extends ConsumerState<ProfileScreen> with
TickerProviderStateMixin {
late final TabController tabController;
#override
void initState() {
super.initState();
tabController = TabController(length: 3, vsync: this);
}
#override
void dispose() {
tabController.dispose();
super.dispose();
}
#override
Widget build(BuildContext context) {
final AsyncValue<List<BasicEventModel>> eventsAsync =
ref.watch(profileEventsProvider(widget.userId));
return AnnotatedRegion<SystemUiOverlayStyle>(
value: Themes.systemUiOverlayStyle(context),
child: Scaffold(
backgroundColor: Themes.color(context, light: Palette.white, dark:
Palette.gray900),
body: ExtendedNestedScrollView(
pinnedHeaderSliverHeightBuilder: () => topPadding + kToolbarHeight,
headerSliverBuilder: (context, innerBoxIsScrolled) => [
ProfileAppBar()
],
body: Column(
children: [
ProfileTabBar(controller: tabController),
Expanded(
child: TabBarView(
controller: tabController,
children: [
eventsAsync.when(
data: (List<BasicEventModel> events) =>
ProfileEventsList(events: events),
error: (Object e, StackTrace s) =>
_eventsText('profile_events_error'.tr()),
loading: () => const ProfileEventsShimmer()
),
// other Widgets for the other tabs
]
)
)
]
)
)
)
);
}
}