diff highlighting patterns

[Volker Kuhlmann]

> It might work OK, but it would probably be both more efficient, simpler, and
> more maintanable to have separate patterns and use the opening lines to
> seect which one to activate.

You mean basically making a different "language"?

I'd like added lines in blue and deleted lines in red. Unified and
normal diffs are conflicting because one uses '^---' for added lines,
the other for removed lines.

> >To fine-tune the patterns for the various diff formats, it seems to be
> >necessary to make body patterns dependent on the first 1 or 2 lines of
> >the file. Is that possible by using parent patterns, or does it make the
> >whole thing terribly inefficient?

Volker

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