evolve: check for uncommited change earlier
Before this patch we were checking for uncommited change multiple times and
quite late for uncommited change. This patch moves the check at the beginning
of the evolve method to avoid these shortcomings.
This software was downloaded from
https://bitbucket.org/marmoute/mutable-history
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>
This software may be used and distributed according to the terms of the GNU
General Public License version 2 or any later version.
On Debian systems, the complete text of the GNU General Public License version
2 can be found in `/usr/share/common-licenses/GPL-2'.