Ticket #20299: 20299-2.patch

wp-includes/revision.php

@@ -446 +446 @@
 
 
 function _set_preview($post) {
-
+        global $post_preview_id;
         if ( ! is_object($post) )
                 return $post;
 
@@ -460 +460 @@
         $post->post_content = $preview->post_content;
         $post->post_title = $preview->post_title;
         $post->post_excerpt = $preview->post_excerpt;
+        
+        $post_preview_id = $preview->ID;
+        add_filter( 'get_post_metadata', '_get_preview_meta', 10, 4 );
 
         return $post;
 }
 
+/**
+ * Private filter for getting metadata for the preview.
+ *
+ * @package WordPress
+ * @subpackage Post_Revisions
+ * @since 3.6.0
+ *
+ * @uses get_meta_data()
+ *
+ * @param unknown $value null
+ * @param int $object_id ID of the object metadata is for
+ * @param string $meta_key Optional. Metadata key. If not specified, retrieve all metadata for
+ *              the specified object.
+ * @param bool $single Optional, default is false. If true, return only the first value of the
+ *              specified meta_key. This parameter has no effect if meta_key is not specified.
+ *
+ * @return string|array Single metadata value, or array of values
+ */
+function _get_preview_meta( $value, $object_id, $meta_key, $single ) {
+        global $post_preview_id;
+
+        if ( !$meta_key )
+                return $value;
+
+        if ( ! in_array( $meta_key, get_versioned_meta_keys() ) )
+                return $value;
+
+        $meta_cache = wp_cache_get( $post_preview_id, 'post_meta' );
+        if ( ! $meta_cache ) {
+                $meta_cache = update_meta_cache( 'post', array( $object_id ) );
+                $meta_cache = $meta_cache[$post_preview_id];
+        }
+        if ( isset( $meta_cache[ $meta_key ] ) )
+                return array_map( 'maybe_unserialize', $meta_cache[ $meta_key ] );
+
+        return $value;
+}
+
 function _wp_get_post_revision_version( $post ) {
         if ( is_array( $post ) ) {
                 if ( ! isset( $post['post_name'] ) ) {