[Bug: 21.4.18] gnus 5.10.7 not rendering Latin-1 headers

[Aidan Kehoe]

 Ar an fichiú lá de mí Feabhra, scríobh Reiner Steib>: 

 > Stephen, I don't understand this finger pointing.  It doesn't bring us
 > any further.  If you look at Gnus' ChangeLog you won't find any
 > changes aiming to stop supporting no-MULE XEmacs.  There are only very
 > few XEmacs specific changes in that area, AFAICS.  Most of these were
 > patches from Aidan WRT latin-unity (I don't know if those are
 > responsible for Mike's problems or not).  

All my Gnus code that touches on latin-unity is wrapped in this (it’s in the
mm-xemacs-find-mime-charset-1 function):

(defmacro mm-xemacs-find-mime-charset (begin end)
  (when (featurep 'xemacs)
    `(and (featurep 'mule) (mm-xemacs-find-mime-charset-1 ,begin ,end))))

So on non-Mule systems, it won’t be touched, and there shouldn’t be
behavioural changes from the old code, which is as it should be.

On fr.lettres.langue.francaise, there are subject lines like this from a
participant using Gnus v5.10.7 on XEmacs 21.4.17 (from
http://groups.google.com/groups?selm=m2wte3cbiw.fsf@baba.ba ):

=?us-ascii?Q?=3D=3Fiso-8859-1=3Fq=3FRe=3A=5FEtymon=5F=5B=3DE9?=
 =?us-ascii?Q?tait=5F=3A=5FRe=3A=5Fquestion=5Fd'un=5Fd=3DE9butant=5Fen=5Fd?=
 =?us-ascii?Q?actylographie=5D=3F=3D?=

Which is broken, clearly (it’s a double encoding which shouldn’t be
happening). 

However, I can’t reproduce that double encoding with 21.4.17, the latest
XEmacs package Gnus (and xemacs -vanilla) , and nor can I reproduce the
described problem with RFC 2047-encoded user names not being decoded, they
work fine for me (even ISO-8859-15 encoded names are decoded, which is
probably broken.) If someone can come up with a more detailed recipe, I’ll
be happy to look into it.

 > If support of no-MULE XEmacs has been broken, it wasn't done on purpose
 > and as I wrote in my previous mail, I'm all for fixing it if someone
 > gives us an idea how to fix it.

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