Editor: Limit display of tags on classic editor.

On the classic editor, limit the search of tags and non-hierarchical taxonomies to twenty results. This in turn prevents an unbounded database query via an AJAX request.

Props pikamander2, costdev, azouamauriac, audrasjb.
Fixes #55052.



git-svn-id: https://develop.svn.wordpress.org/trunk@53089 602fd350-edb4-49c9-b593-d223f7449a82

src/js/_enqueues/admin/tags-suggest.js

@@ -63,7 +63,8 @@
 				$.get( window.ajaxurl, {
 					action: 'ajax-tag-search',
 					tax: taxonomy,
-					q: term
+					q: term,
+					number: 20
 				} ).always( function() {
 					$element.removeClass( 'ui-autocomplete-loading' ); // UI fails to remove this sometimes?
 				} ).done( function( data ) {

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

@@ -158,6 +158,7 @@ function wp_ajax_ajax_tag_search() {
 			'name__like' => $s,
 			'fields'     => 'names',
 			'hide_empty' => false,
+			'number'     => isset( $_GET['number'] ) ? (int) $_GET['number'] : 0,
 		)
 	);