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From: Colin Walters <walters@cis.ohio-state.edu>
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Subject: Re: weird error message about X-Face:
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Simon Josefsson <jas@extundo.com> writes:

> Is it related to this one?
> 
> 2001-06-24  Simon Josefsson  <jas@extundo.com>
> 
> 	* rfc2047.el (rfc2047-fold-region): The check to skip WSP
> 	insertion when breaking lines looked for " \t" instead of "[ \t]".
> 	(rfc2047-encode-message-header): Fold lines even if
> 	no QP encoding is done.

I believe so.  The following patch seems to fix the problem for me.

As I see it, the problem was that rfc2047-fold-region was destroying
the space following the colon in the header.  I think it makes more
sense to just fold the header _value_.  Just (skip-chars-forward "^:")
is sufficient to skip over the header name, right?

2001-07-05  Colin Walters  <walters@cis.ohio-state.edu>

	* rfc2047.el (rfc2047-encode-message-header): Don't include the
	header name when folding.

--- rfc2047.el.~6.14.~	Fri Jun 29 02:51:27 2001
+++ rfc2047.el	Thu Jul  5 17:30:11 2001
@@ -138,7 +138,8 @@
 		     (point-min) (point-max)
 		     (car message-posting-charset)))
 		;; No encoding necessary, but folding is nice
-		(rfc2047-fold-region (point-min) (point-max)))
+		(rfc2047-fold-region (save-excursion
+				       (skip-chars-forward "^:")) (point-max)))
 	    ;; We found something that may perhaps be encoded.
 	    (setq method nil
 		  alist rfc2047-header-encoding-alist)