GNU bug report logs - #35383
27.0.50; Complete process of decoding Gnus group names

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From: Katsumi Yamaoka <yamaoka <at> jpl.org>
To: Eric Abrahamsen <eric <at> ericabrahamsen.net>
Cc: 35383 <at> debbugs.gnu.org
Subject: bug#35383: 27.0.50; Complete process of decoding Gnus group names
Date: Wed, 24 Apr 2019 17:06:19 +0900

[Message part 1 (text/plain, inline)]

Hi,

I found that certain kinds[1] of Japanese mails (like the
attached text part) saved in a nnml group get corrupted when
viewing.  The root cause is this:

(defvar nnmail-file-coding-system 'undecided
  "Coding system used in nnmail.")

The default value used to be `raw-text'.
Because `nnml-file-coding-system' inherits it, when viewing
an article from a file `nnmail-find-file' reads and decodes
the contents, and then `gnus-display-mime'[1] decodes it again.
IIUC `gnus-display-mime' expects a raw article, so any back end
should not decode the first fetched data, I think.  This helps:

(setq nnml-file-coding-system 'raw-text)

Note that the backlog or the `gnus-original-article-buffer'
keeps an corrupted article, so (setq gnus-keep-backlog nil) and
each time killing the original buffer will make it easy to debug.

[1] a single text/plain part with format=flowed spec, or
    a multipart message containing a text/plain part, etc.
[2] The default value of `gnus-display-mime-function'.

Regards,

[Message part 2 (text/plain, inline)]

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処に住む処やぶら小路の藪柑子パイポパイポパイポのシューリンガン
シューリンガンのグーリンダイグーリンダイのポンポコピーのポンポコ
ナーの長久命の長助

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