highlight: convert text to local before passing to pygmentize (issue1341) Example case: Display file written in iso-8859-1 with current HGENCODING utf-8. At the moment only an Error page appears because pygmentize chokes on the replacement chars. Alternatives: 1) Turn off highlighting and avoid UnicodeDecodeError for files that are not in HGENCODING. 2) [this patch] use util.tolocal to display these files. Alternative 2) seems ok, as this only concerns display and readability. See also: fe38b0a3a928, apparently put aside during refactor of highlight. Add test for UnicodeDecodeError with iso-8859-1 file contents.