How to resolve the issue of Flutter Scrollbar not functioning properly with scrollController?

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There are several potential solutions to resolve the issue of Flutter Scrollbar not functioning properly with scrollController:

1. Ensure that the Scrollbar widget is wrapped around the ListView or ScrollView that is linked to the scrollController.
2. Check that the scrollController is properly initialized and associated with the ListView or ScrollView.
3. Verify that the Scrollbar is not obscured or hidden by any other widget on the screen.
4. Use the isAlwaysShown property of the Scrollbar widget to force it to always appear, even when not actively scrolling.
5. If none of the above solutions work, consider using a custom scrollbar widget that can be more easily customized and manipulated.