handle deleting instances

Author: AhmedAbdoElhawary

lib/features/sorting/shell/view/shell_sort_page.dart

@@ -9,20 +9,14 @@ final _notifierProvider = StateNotifierProvider<SortingNotifier, SortingNotifier
   (ref) => ShellSortNotifier(),
 );
 
-class ShellSortPage extends ConsumerStatefulWidget {
+class ShellSortPage extends StatefulWidget {
   const ShellSortPage({super.key});
 
   @override
-  ConsumerState<ShellSortPage> createState() => _ShellSortPageState();
+  State<ShellSortPage> createState() => _ShellSortPageState();
 }
 
-class _ShellSortPageState extends ConsumerState<ShellSortPage> {
-  @override
-  void deactivate() {
-    ref.invalidate(_notifierProvider); // deletes current instance and resets
-    super.deactivate();
-  }
-
+class _ShellSortPageState extends State<ShellSortPage> {
   @override
   Widget build(BuildContext context) {
     return SortingPage(instance: _notifierProvider, title: StringsManager.shellSort);