See http://irclog.perlgeek.de/darcs/2010-09-02#i_2776068
We don't want to completely minimise the context because the result
could be quite huge (no tags), but minimising to the latest common tag
sounds fairly sane and easy to do.
This would make it easy to apply patches that are sent against repos
that are more advanced than ours, but which don't necessarily depend on
those advancements.
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