Ticket #23973: 23973.patch

wp-includes/revision.php

@@ -65 +65 @@
  *
  * @since 3.6
  * @access private
+ * @uses apply_filters() Calls '_wp_post_revision_meta_keys'
  * @return array An array of meta keys that should be revisioned.
  */
 function _wp_post_revision_meta_keys() {
-        return array(
+        $meta_keys = array(
                 '_wp_format_url',
                 '_wp_format_quote',
                 '_wp_format_quote_source',
@@ -77 +78 @@
                 '_wp_format_audio',
                 '_wp_format_video',
         );
+        return apply_filters( '_wp_post_revision_meta_keys', $meta_keys );
 }
 
 /**