notificationContext property
override
The BuildContext that should be used when dispatching ScrollNotifications.
This context is typically different that the context of the scrollable widget itself. For example, Scrollable uses a context outside the Viewport but inside the widgets created by ScrollBehavior.buildOverscrollIndicator and ScrollBehavior.buildScrollbar.
Implementation
@override
BuildContext? get notificationContext => _gestureDetectorKey.currentContext;