plugin=diff is not implemented.
http://yellow.ribbon.to/~tuotehhou/index.php?%2BWinForm%2BKeyPress%E3%81%A7Ctrl%E3%81%AE%E6%8A%BC%E4%B8%8B%E3%82%92%E6%A4%9C%E5%87%BA%E3%81%99%E3%82%8B
plugin=diff is not implemented.