--- a/wp/wp-includes/widgets/class-wp-widget-calendar.php	Thu Sep 29 08:06:27 2022 +0200
+++ b/wp/wp-includes/widgets/class-wp-widget-calendar.php	Fri Sep 05 18:40:08 2025 +0200
@@ -66,7 +66,7 @@
 		echo '</div>';
 		echo $args['after_widget'];
 
-		self::$instance++;
+		++self::$instance;
 	}
 
 	/**