[Notifications] Improve handling of centre

config/ags/notifications/handler.tsx

@@ -59,7 +59,11 @@ class Notifier implements Subscribable {
     private show ( id: number ) {
         this.set( id, Notification( {
             notification: this.notifications.get( id )!,
-            onHoverLost: () => this.hide( id ),
+            onHoverLost: () => { 
+                if ( !this.menuOpen ) {
+                    this.hide( id );
+                }
+            },
             setup: () => timeout( TIMEOUT_DELAY, () => {
                 if ( !this.menuOpen ) {
                     this.hide( id );
@@ -100,6 +104,9 @@ class Notifier implements Subscribable {
         this.hide( id );
         this.notifications.get( id )?.dismiss();
         this.notifications.delete( id );
+        if ( this.notifications.size == 0 ) {
+            this.menuOpen = false;
+        }
     }
 
     openNotificationMenu () {