plugin=diff is not implemented.
http://yellow.ribbon.to/~tuotehhou/index.php?%2BC%EF%BC%83%2BAction%EF%BC%9CT%EF%BC%9E%E3%83%87%E3%83%AA%E3%82%B2%E3%83%BC%E3%83%88
plugin=diff is not implemented.