Enhance WP_Query ordering by adding new fields to the orderby array. Included 'post__in', 'post_name__in', 'post_parent__in', and 'include' to improve query flexibility and support additional ordering scenarios.

Author: ramonjd

src/wp-includes/class-wp-query.php

@@ -2527,6 +2527,10 @@ public function get_posts() {
 				'ID',
 				'rand',
 				'relevance',
+				'post__in',
+				'post_name__in',
+				'post_parent__in',
+				'include',
 			);
 
 			$orderby_array               = array();