Is there a summary what exactly is hard about it? For the text syncing part there is an excellent free library from Google: http://code.google.com/p/google-dif

Is there a summary what exactly is hard about it? For the text syncing part there is an excellent free library from Google: http://code.google.com/p/google-diff-match-patch/ http://code.google.com/p/google-diff-match-patch/