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_ndiff_classes is used in _string_history_diff to generate css class names for each line based on whether it is an addition or deletion.

Re: moving the call to cgi.escape to the very end....

Yeah, I think what you suggest is probably safe. At the worst it would mean that difflib would produce a different set of changes (because of the way difflib resynchronises after a change). This relies on the cgi.escape making minimal changes. Would you like me to rework the patch?

- Toby (but not logged into sourceforge from this machine)