incorrect changeset diff for files containing html

http://bitbucket.org/tortoisehg/thg/changeset/4dc1120f899c

displays one   in the source as space and a '<' as literal '<'

Looks like payload (diff data) is parsed in ways it shouldn't.

Compare with
http://bitbucket.org/tortoisehg/thg/changeset/4dc1120f899c/raw/thg-4dc1120f899c.diff

(which looks correct)