Comments: Introduce the `cache_domain` argument for `WP_Comment_Query` to allow caching to a unique set of cache buckets.

See [18128] for `get_terms()` and [37572] for `WP_Term_Query`.

Props Chouby, rachelbaker.
Fixes #37419.
Built from https://develop.svn.wordpress.org/trunk@38117


git-svn-id: http://core.svn.wordpress.org/trunk@38058 1a063a9b-81f0-0310-95a4-ce76da25c4cd

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

@@ -151,6 +151,7 @@ class WP_Comment_Query {
 	 * @since 4.4.0 Order by `comment__in` was added. `$update_comment_meta_cache`, `$no_found_rows`,
 	 *              `$hierarchical`, and `$update_comment_post_cache` were added.
 	 * @since 4.5.0 Introduced the `$author_url` argument.
+	 * @since 4.6.0 Introduced the `$cache_domain` argument.
 	 * @access public
 	 *
 	 * @param string|array $query {
@@ -250,6 +251,8 @@ class WP_Comment_Query {
 	 *                                                   The parameter is ignored (forced to `false`) when
 	 *                                                   `$fields` is 'ids' or 'counts'. Accepts 'threaded',
 	 *                                                   'flat', or false. Default: false.
+ 	 *     @type string       $cache_domain              Unique cache key to be produced when this query is stored in
+	 *                                                   an object cache. Default is 'core'.
 	 *     @type bool         $update_comment_meta_cache Whether to prime the metadata cache for found comments.
 	 *                                                   Default true.
 	 *     @type bool         $update_comment_post_cache Whether to prime the cache for comment posts.
@@ -299,6 +302,7 @@ class WP_Comment_Query {
 			'meta_query' => '',
 			'date_query' => null, // See WP_Date_Query
 			'hierarchical' => false,
+			'cache_domain' => 'core',
 			'update_comment_meta_cache' => true,
 			'update_comment_post_cache' => false,
 		);

wp-includes/version.php

@@ -4,7 +4,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '4.6-beta3-38116';
+$wp_version = '4.6-beta3-38117';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.