plugin=diff is not implemented.
http://yellow.ribbon.to/~tuotehhou/index.php?%2BCSharp%2B%E3%82%B8%E3%82%A7%E3%83%8D%E3%83%AA%E3%83%83%E3%82%AF%E3%81%AE%E3%83%91%E3%83%95%E3%82%A9%E3%83%BC%E3%83%9E%E3%83%B3%E3%82%B9
plugin=diff is not implemented.