bug#1174: 23.0.60; Some UTF-8 mails displaying wrongly in Emacs 23

[Frank Schmitt <ich@frank-schmitt.net>]

Eli Zaretskii <eliz@gnu.org> writes:

>> > It was acatually the right hint.  ISTR there was a problem in Gnus with
>> > 8-bit encoded articles, but all I could find is
>> > <http://permalink.gmane.org/gmane.emacs.gnus.general/67112>.
>> 
>> Yes, this seems to be the same problem I am seeing. Any idea on how I
>> could further debug this? It is a real show-stopper for me.

Got it!

In lisp/gnus/nnimap.el there is 

(defun nnimap-demule (string)
  ;; BEWARE: we used to use string-as-multibyte here which is braindead
  ;; because it will turn accidental emacs-mule-valid byte sequences
  ;; into multibyte chars.  --Stef
  ;; Reverted, braindead got 7.5 out of 10 on imdb, so it can't be
  ;; that bad. --Simon
  (funcall (if (and (fboundp 'string-as-multibyte)
		    (subrp (symbol-function 'string-as-multibyte)))
	       'string-as-multibyte
	     'identity)
	   (or string "")))

which is called at several places. And this breaks it. If I change this
function so that string is not changed, my mails are displayed correctly.

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