extra space in subject with tmail

if the subject of a mail is something like: Subject: =?iso-8859-1?Q?V=E0ries_cos?= =?iso-8859-1?Q?es?=

An extra space is inserted between "cos" and "es" so we have "cos es" instead of "coses". It is wrong as we can see in http://www.faqs.org/rfcs/rfc2047... (just look at the sample that says "White space between adjacent 'encoded-word's is not displayed.")

The problem is in quote.rb (in actionmailer-2.2.2/lib/action_mailer/vendor/tmail-1.2.3/tmail/quoting.rb).

I just changed a couple of lines and it seems to work. This is the diff:

62a63

from_charset = nil 64c65

< before = $1

      before = (from_charset && $2 && $1.strip=="") ? "" : $1