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From: Jesper Harder <harder@ifa.au.dk>
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Subject: Re: bug in latest gnus when previewing certain message
Date: Fri, 30 May 2003 04:52:58 +0200
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Cc: bugs@gnus.org, "Vladimir Volovich" <vvv@vsu.ru>
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Dave Love <d.love@dl.ac.uk> writes:

> Jesper Harder <harder@myrealbox.com> writes:
>
>>> "Vladimir Volovich" <vvv@vsu.ru> writes:
>>>
>>>> using the latest gnus from cvs, i get the following error when trying to
>>>> view the attached (spam) message:
>>>>
>>>> Debugger entered--Lisp error: (args-out-of-range 650 650)
>>>>   mm-decode-coding-region(650 650 koi8-r)
>>>>   mail-decode-encoded-word-region(1 883)
>>
>> I think this change is the culprit:
>>
>> ,----
>> | 2003-05-02  Dave Love  <fx@gnu.org>
>> | 
>> | 	* rfc2047.el (rfc2047-q-encode-region, rfc2047-decode): Use
>> | 	mm-with-unibyte-current-buffer.
>> `----
>
> I don't see how that change could cause the error above.

It's some kind of bad interaction between narrowing and
`mm-with-unibyte-current-buffer'.  This example illustrates the
effect:

(with-temp-buffer
  (insert "From: ニシキノネット　FC事業部
Content-Type: text/plain; charset=ISO-2022-JP\n\n")
  (article-narrow-to-head)
  (mm-with-unibyte-current-buffer)
  (buffer-string))

=>
"From: ニシキノネット　FC事業部
Content-Type: text/plain"

Note how the last part of the text has been chopped off.  

If you edebug `rfc2047-decode' and step through Vladimirs example,
you'll see that this is also what's happening there.