Email text that confuses charset recognition in emacs

[Giorgos Keramidas <keramida@ceid.upatras.gr>]

Hi everyone,

I just noticed that the attached email message confuses the charset
detection machinery of Emacs, and it starts interpreting all text as
Japanese text -- even though most of the contents of the file are plain
us-ascii text.

I first noticed the problem when I received the attached message from
the `freebsd-current' mailing list, and the text looked Japanese in a
Gnus article buffer.  But saving the email text with `C-u M-g' to look
at the raw article text and re-opening the raw article text in Emacs
always shows Japanese text.

If I open the article text with `M-x find-file-literally', I can read
all of the English text, minus a few parts of the attribution line of
the email text.

The problem seems to start near this text in the email body:

| >>> In message <18DF99B0-6E66-4906-A233-7778451B8A92@felyko.com>, Rui Paulo
| >>> writes:
| >>>> 2013/04/15 9:55^[$B!"^[(BCy Schubert <Cy.Schubert@komquats.com> ^[$B$N%a%C%;!<%8^[
| >> (B:

I think it's because one of the intermediate mail relays (or even Gmail,
which got the final delivery for me) wrapper a line of text in the
middle of the byte sequence: "%8^[(B" one line before the last one.

In fact, joining the two last lines, and removing the bogusly inserted
text of "\n>> " restores the sequence to something that decodes properly
in Emacs:

    >>>> 2013/04/15 9:55^[$A!"^[(BCy Schubert <Cy.Schubert@komquats.com> ^[$A$N%a%C%;^[$B!<^[$A%8^[(B:

Since this is not a problem in what Emacs does with charset decoding of
the entire buffer, is it something we should try to fix in Gnus?  Is
there any way we can detect this sort of decoding problem at all?

I am running an Emacs snapshot built earlier this morning from this
version, by the way:

| 0416 18:10 saturn:~/git/emacs$ git log -1
| commit 3e440d19d12bc740010d9e98958d529260eea321
| Author: Michael Albinus <michael.albinus@gmx.de>
| Date:   Tue Apr 16 10:11:56 2013 +0200
|
|     * tramp.texi (Frequently Asked Questions): Precise, how to define
|     an own ControlPath.

Here's also the uuencoded "broken" text of the email/article buffer:

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