Boris Feld <boris.feld@octobus.net> [Fri, 02 Jun 2017 19:07:35 +0200] rev 2548
effectflag: fix content change detection for filtered revs
In some cases (like amended an obsolete changeset), computing the diff and
comparing them need to work with filtered revisions. We need to use unfiltered
change contexts to safely compute diffs.