Fix broken counting of orders inside order project

backend/app/plugins/wiaas/includes/order/class-wiaas-order-project.php

@@ -31,11 +31,23 @@ class Wiaas_Order_Project {
 			'show_admin_column' => true,
 			'query_var'         => true,
 			'rewrite'           => array( 'slug' => 'shop_order_project' ),
+			'update_count_callback' => array(__CLASS__, 'update_count_callback')
 		);
 
 		register_taxonomy( 'shop_order_project', array( 'shop_order' ), $args );
 	}
 
+	/**
+	 * Callback to handle counting of number of orders inside every project
+	 * This does not work out of the box for orders since they are marked as private post type
+	 *
+	 * @param array $project_ids
+	 */
+	public static function update_count_callback($project_ids) {
+		// Update counts
+		_update_generic_term_count( $project_ids, get_taxonomy('shop_order_project') );
+	}
+
 	/**
 	 * Retrieves available order projects
 	 * @return array List of available order projects