REST API: Fix _fields filtering of registered rest fields.

Use rest_is_field_included when determining which additional fields to include to permit filtering by nested field properties.

Props Dudo, kadamwhite, TimothyBlynJacobs.
Fixes #49648.

Built from https://develop.svn.wordpress.org/trunk@47511


git-svn-id: http://core.svn.wordpress.org/trunk@47286 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/rest-api/endpoints/class-wp-rest-controller.php

@@ -451,7 +451,7 @@ abstract class WP_REST_Controller {
 				continue;
 			}
 
-			if ( ! in_array( $field_name, $requested_fields, true ) ) {
+			if ( ! rest_is_field_included( $field_name, $requested_fields ) ) {
 				continue;
 			}
 

wp-includes/version.php

@@ -13,7 +13,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '5.5-alpha-47510';
+$wp_version = '5.5-alpha-47511';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.