Coding system of compressed PO files is not recognized

[Sven Joachim]

It seems that Emacs has a problem detecting the correct encoding of
compressed PO files.  Attached is a compressed PO file "de.po.gz" in
utf-8 encoding which Emacs failed to display correctly.  The German
umlauts were displayed as octal sequences.  This problem does not
occur if the file is either uncompressed or renamed to some other name
which does not indicate a PO file, e.g. "junk.gz".


In GNU Emacs 22.0.50.1 (i486-pc-linux-gnu, X toolkit, Xaw3d scroll bars)
  of 2006-03-02 on debian, modified by Debian
X server distributor `The X.Org Foundation', version 11.0.60900000
configured using `configure '--build' 'i486-linux-gnu' '--host' 'i486-linux-gnu' '--prefix=/usr' '--sharedstatedir=/var/lib' '--libexecdir=/usr/lib' 
'--localstatedir=/var' '--infodir=/usr/share/info' '--mandir=/usr/share/man' '--with-pop=yes' 
'--enable-locallisppath=/etc/emacs-snapshot:/etc/emacs:/usr/local/share/emacs/22.0.50/site-lisp:/usr/local/share/emacs/site-lisp:/usr/share/emacs/22.0.50/site-lisp:/usr/share/emacs/site-lisp:/usr/share/emacs/22.0.50/leim' 
'--with-x=yes' '--with-x-toolkit=athena' '--with-toolkit-scroll-bars' 'CFLAGS=-DDEBIAN -g -O2 -Wno-pointer-sign' 'build_alias=i486-linux-gnu' 
'host_alias=i486-linux-gnu''

Important settings:
   value of $LC_ALL: C
   value of $LC_COLLATE: C
   value of $LC_CTYPE: nil
   value of $LC_MESSAGES: nil
   value of $LC_MONETARY: nil
   value of $LC_NUMERIC: nil
   value of $LC_TIME: nil
   value of $LANG: de_DE
   locale-coding-system: nil
   default-enable-multibyte-characters: t

Major mode: Fundamental

Minor modes in effect:
   tooltip-mode: t
   auto-compression-mode: t
   tool-bar-mode: t
   mouse-wheel-mode: t
   menu-bar-mode: t
   file-name-shadow-mode: t
   global-font-lock-mode: t
   font-lock-mode: t
   blink-cursor-mode: t
   unify-8859-on-encoding-mode: t
   utf-translate-cjk-mode: t
   line-number-mode: t

Recent input:
C-x d t m p <tab> <return> <down> <down> <down> <down>
<down> <down> <down> <return> M-x r e p o r t - e m
a c s - b u g <return>

Recent messages:
(emacs -Q)
For information about the GNU Project and its goals, type C-h C-p.
Loading dired...
Loading regexp-opt...done
Loading dired...done
Loading jka-compr...done
uncompressing de.po.gz...
Loading po...done
uncompressing de.po.gz...done
Loading emacsbug...done

de.po.gz
Description: application/gzip