topic: make revsets like foo#stack[-1] work too
We remove base commit when n < 0 because it's confusing to see base (which
technically isn't a commit inside the stack) at both 0 and -n.
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Copyright 2011 Peter Arrenbrecht <peter.arrenbrecht@gmail.com>
Logilab SA <contact@logilab.fr>
Pierre-Yves David <pierre-yves.david@ens-lyon.org>
Patrick Mezard <patrick@mezard.eu>
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