Ticket #44343: 44343.diff

src/wp-admin/includes/ajax-actions.php

@@ -565 +565 @@
                 );
         }
 
+        $dropdown_args = array(
+                'taxonomy'         => $taxonomy->name,
+                'hide_empty'       => 0,
+                'name'             => 'new' . $taxonomy->name . '_parent',
+                'orderby'          => 'name',
+                'hierarchical'     => 1,
+                'show_option_none' => '— ' . $taxonomy->labels->parent_item . ' —',
+        );
+
+        /**
+         * Filters the arguments for the taxonomy dropdown.
+         *
+         * @param array $dropdown_args
+         */
+        $dropdown_args = apply_filters( 'ajax_add_hierarchical_term_dropdown_args', $dropdown_args );
+
         ob_start();
 
-        wp_dropdown_categories(
-                array(
-                        'taxonomy'         => $taxonomy->name,
-                        'hide_empty'       => 0,
-                        'name'             => 'new' . $taxonomy->name . '_parent',
-                        'orderby'          => 'name',
-                        'hierarchical'     => 1,
-                        'show_option_none' => '— ' . $taxonomy->labels->parent_item . ' —',
-                )
-        );
+        wp_dropdown_categories( $dropdown_args );
 
         $sup = ob_get_clean();