Comment 7 for bug 558039

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Looks like good for english text (may be for western) but
folding white space should be treated as null string ('') in
iso-2022-jp encoded japanese (and other RFC 2047 encoded
MIME subject, I believe). u' '.join() must be u''.join() in
these languages. You must alway check if the part of the
header is mime encoded or not when joining. :-(