Manual:Hooks/NewDifferenceEngine/de-formal

Details

 * $title: the diff page title (nullable)
 * &$oldId: the actual old Id to use in the diff
 * &$newId: the actual new Id to use in the diff (0 means current)
 * $old: the ?old= param value from the url
 * $new: the ?new= param value from the url