plugin=diff is not implemented.
http://tuotehhou.y.ribbon.to/index.php?%2BSL%2BGrid%E3%81%AB%E3%82%B9%E3%82%AF%E3%83%AD%E3%83%BC%E3%83%AB%E3%83%90%E3%83%BC%E3%82%92%E4%BB%98%E3%81%91%E3%82%8B
plugin=diff is not implemented.