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bug#2015: 23.0.60; Rmail decodes messages incorrectly


From: Chong Yidong
Subject: bug#2015: 23.0.60; Rmail decodes messages incorrectly
Date: Sat, 31 Jan 2009 10:37:16 -0500

> Rmail does not correctly decode quoted-printable messages.  For
> example, a message that has these headers:
>
>   Content-Type: text/plain; charset=WINDOWS-1252; delsp=yes;
>   format=flowed
>   Content-Transfer-Encoding: quoted-printable
>
> Shows a Windows-1252 character \226 as an octal escape, and says that
> the buffer's encoding is undecided-unix.
>
> In addition, Rmail before mbox merge would rewrite
> Content-Transfer-Encoding header into "8-bit", when it decoded the
> quoted-printable encoding, but the current Rmail does not.

IIUC, the new Rmail decodes quoted-printable messages during message
display, leaving the original message unchanged in the Rmail file.
That's why it does not change Content-Transfer-Encoding to "8bit".

I don't see why Rmail would fail to correctly decode a message with the
headers you provided.  Here's a shot in the dark: if you add the line

  (setq last-coding-system-used nil)

to line 2564 of rmail.el, just before the call to rmail-decode-region,
is there any improvement?






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