Merge pull request #602 from markewallace/fix_587

Fix: NotificationService does not remove references to closed notifications

Author: zvonimirfras

src/notification/notification.service.ts

@@ -144,6 +144,10 @@ export class NotificationService implements OnDestroy {
 				setTimeout( () => {
 					this.applicationRef.detachView(notificationRef.hostView);
 					notificationRef.destroy();
+					const index = this.notificationRefs.indexOf(notificationRef);
+					if (index !== -1) {
+						this.notificationRefs.splice(index, 1);
+					}
 				}, 200);
 			}
 		}