VM often uses charset=unknown instead of iso-8859-15

[Mike FABIAN]

See also:

http://bugzilla.novell.com/show_bug.cgi?id=139625

When trying to send a mail with VM which could be encoded in
iso-8859-15, i.e. when the the mail contains German umlauts äöüßÄÜÖ
and the Euro symbol €, VM 7.19 running under GNU Emacs 21.3.1 uses
charset=unknown for the outgoing mail.

The reason is that there is no entry for "iso-8859-15" in
vm-mime-mule-charset-to-charset-alist in vm-vars.el:

(defvar vm-mime-mule-charset-to-charset-alist
  '(
    (latin-iso8859-1    "iso-8859-1")
    (latin-iso8859-2    "iso-8859-2")
    (latin-iso8859-3    "iso-8859-3")
    (latin-iso8859-4    "iso-8859-4")
    (cyrillic-iso8859-5 "iso-8859-5")
    (arabic-iso8859-6   "iso-8859-6")
    (greek-iso8859-7    "iso-8859-7")
    (hebrew-iso8859-8   "iso-8859-8")
    (latin-iso8859-9    "iso-8859-9")
    (japanese-jisx0208  "iso-2022-jp")
    (korean-ksc5601     "iso-2022-kr")
    (chinese-gb2312     "iso-2022-jp")
    (sisheng            "iso-2022-jp")
    (thai-tis620        "iso-2022-jp")
   )
  "Alist that maps MULE character sets to matching MIME character sets.")

The attached patch fixes the problem.

The patch also adds iso-8859-15 in two other places as well, to fix
the problem Egbert Eich <eich at suse.de> (CC:) is encountering, adding
it to vm-mime-mule-charset-to-charset-alist is enough.

But adding iso-8859-15 in the other two places is probably also
useful.

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-- 
Mike FABIAN   <mfabian at suse.de>   http://www.suse.de/~mfabian
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