locale is ignored for displaying text (no charset conversion)?

It seems that mutt is ignoring the locale setting when displaying text:

My terminals have native ISO-8859-1 (latin1) and locale is set properly.
But mails with a different character set are not converted into ISO-8859-1
when displaying. For example, UTF-8 is displayed binary and not in
ISO-8859-1. This looks like:

From: framstag@rus.uni-stuttgart.de
To: framstag@rus.uni-stuttgart.de
Subject: F*EX-upload: zzA¼A?A*zz
Date: Wed, 2 Jul 2008 19:18:44 +0200 (CEST)

framstag has uploaded the file
"zzA¼A?A*zz"
(2009 kB) for you.

The relevant headers of this mail are:

Subject: F*EX-upload: =?UTF-8?Q?zz=C3=A4=C3=BC=C3=9F=C2=A0zz?=
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: quoted-printable

This mail should be displayed as:

From: framstag@rus.uni-stuttgart.de
To: framstag@rus.uni-stuttgart.de
Subject: F*EX-upload: zzäüß*zz
Date: Wed, 2 Jul 2008 19:18:44 +0200 (CEST)

framstag has uploaded the file
"zzäüß*zz"
(2009 kB) for you.


My setup is:

Mutt 1.5.18 (2008-05-17)
System: Linux 2.6.24-18-generic (i686)
ncurses: ncurses 5.6.20071124 (compiled with 5.6)
Compile options:
(...)
-ENABLE_NLS -LOCALES_HACK +HAVE_WC_FUNCS +HAVE_LANGINFO_CODESET +HAVE_LANGINFO_YESEXPR
+HAVE_ICONV -ICONV_NONTRANS -HAVE_LIBIDN +HAVE_GETSID -USE_HCACHE

framstag@fex:/sw/src/mutt-1.5.18: locale | grep LC_CTYPE
LC_CTYPE="en_US"

framstag@fex:/sw/src/mutt-1.5.18: locale -k LC_CTYPE | grep charmap
charmap="ISO-8859-1"


--
Ullrich Horlacher Informationssysteme und Serverbetrieb
Rechenzentrum E-Mail: horlacher@rus.uni-stuttgart.de
Universitaet Stuttgart Tel: ++49-711-685-65868
Allmandring 30 Fax: ++49-711-682357
70550 Stuttgart (Germany) WWW: http://www.rus.uni-stuttgart.de/

Ulli Horlacher <framstag@rus.uni-stuttgart.de> wrote:

> My terminals have native ISO-8859-1 (latin1) and locale is set properly.
> But mails with a different character set are not converted into ISO-8859-1
> when displaying. For example, UTF-8 is displayed binary and not in
> ISO-8859-1.

I have it :-)

When I start mutt with -n option (do not read system-muttrc) the text is
displayed in the correct character set.

I have a really heavy modified system-muttrc with a lot of changes to the
default (grow up in all those years).

I searched for all occurences of "ISO" and "charset" and this one was the
bad one:

charset-hook "" iso-8859-1

I do not remember exactly when and why I have added this line to my
muttrc, but without this line mutt now displays text with the correct
charset encoding.


--
Ullrich Horlacher Informationssysteme und Serverbetrieb
Rechenzentrum E-Mail: horlacher@rus.uni-stuttgart.de
Universitaet Stuttgart Tel: ++49-711-685-65868
Allmandring 30 Fax: ++49-711-682357
70550 Stuttgart (Germany) WWW: http://www.rus.uni-stuttgart.de/