add callback

libs/ui/src/lib/assistant/assistant.component.ts

@@ -154,6 +154,11 @@ export class GfAssistantComponent implements OnChanges, OnInit {
     private destroyRef: DestroyRef
   ) {
     addIcons({ closeCircleOutline, closeOutline, searchOutline });
+    this.destroyRef.onDestroy(() => {
+      if (this.preselectionTimeout) {
+        clearTimeout(this.preselectionTimeout);
+      }
+    });
   }
 
   @HostListener('document:keydown', ['$event'])
@@ -552,12 +557,6 @@ export class GfAssistantComponent implements OnChanges, OnInit {
     this.isOpen = aIsOpen;
   }
 
-  public ngOnDestroy() {
-    if (this.preselectionTimeout) {
-      clearTimeout(this.preselectionTimeout);
-    }
-  }
-
   private getCurrentAssistantListItem() {
     return this.assistantListItems.find(({ getHasFocus }) => {
       return getHasFocus;