Listing service privacy

src/lib/listing/services/listing.service.ts

@@ -21,9 +21,9 @@ export class ListingService<E extends IListable> {
     private readonly _selected$ = new BehaviorSubject<(string | number)[]>([]);
 
     constructor(
-        private readonly _filterService: FilterService,
-        private readonly _searchService: SearchService<E>,
-        private readonly _entitiesService: EntitiesService<E>,
+        protected readonly _filterService: FilterService,
+        protected readonly _searchService: SearchService<E>,
+        protected readonly _entitiesService: EntitiesService<E>,
     ) {
         this.displayed$ = this._getDisplayed$;
         this.displayedLength$ = this.displayed$.pipe(getLength, shareDistinctLast());