* Ralf Fassel <[email protected]>
| In my setting process-coding-system-alist is nil, but
| 'default-process-coding-system' is (iso-latin-9-unix . iso-latin-9-unix).  
| So what is really sent to w3m is latin-9, but w3m is told to process the
| input as UTF-8.  This replaces the latin-9 non-ASCII chars by " ".
>
| If I temporarily set
|   (default-process-coding-system '(utf-8 . utf-8))
| then the Presentation buffer contains the correct decoded mail message.
>
| IMHO 'vm-mime-display-internal-w3m-text/html' should temporarily adjust
| the default-process-coding-system to match what w3m is told to expect.

In GNU Emacs, this works for me (don't know for Xemacs):

--- vm-8.2.0b/lisp/vm-mime.el~  2011-12-27 23:19:28.000000000 +0100
+++ vm-8.2.0b/lisp/vm-mime.el   2015-01-30 13:12:45.488159066 +0100
@@ -2719,7 +2719,9 @@
     part))
 
 (defun vm-mime-display-internal-w3m-text/html (start end layout)
-  (let ((charset (or (vm-mime-get-parameter layout "charset") "us-ascii")))
+  (let* ((charset (or (vm-mime-get-parameter layout "charset") "us-ascii"))
+        (cds (coding-system-from-name charset))        
+        (default-process-coding-system (if cds (cons cds cds) 
default-process-coding-system)))
     (shell-command-on-region
      start (1- end)
      (format "w3m -dump -T text/html -I %s -O %s" charset charset)

Diff finished.  Fri Jan 30 13:12:51 2015


HTH
R'

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