Ticket #30127: 30127.diff

src/wp-includes/taxonomy.php

@@ -2407 +2407 @@
                 $force_default = $args['force_default'];
         }
 
+        /**
+         * Fires when deleting a term, before any modifications are made to posts or terms.
+         *
+         * @since 4.1.0
+         *
+         * @param int $term Term ID
+         * @param string $taxonomy Taxonomy Name
+         */
+        do_action( 'before_delete_term', $term, $taxonomy );
+
         // Update children to point to new parent
         if ( is_taxonomy_hierarchical($taxonomy) ) {
                 $term_obj = get_term($term, $taxonomy);