bug#2497: 23.0.91; Fails to read UTF-8 on Win2k

[Stefan Monnier <monnier@iro.umontreal.ca>]

>> The guessing shouldn't give priority to buffer-file-coding-system.
>> Instead we have the set-coding-system-priority instead.

> Please give me some credit: I said ``the _default_value_ of
> buffer-file-coding-system''.  That default tells volumes about the
> coding-system priorities.

I'm sorry for my bad wording: what I wrote was only meant to describe
the way the code is currently expected to work (AFAIK).

>   M-: (coding-system-priority-list) RET
>   =>  (iso-latin-1 utf-8 iso-2022-7bit iso-2022-7bit-lock iso-2022-8bit-ss2 emacs-mule raw-text iso-2022-jp in-is13194-devanagari chinese-iso-8bit utf-8-auto utf-8-with-signature utf-16 utf-16be-with-signature utf-16le-with-signature utf-16be utf-16le japanese-shift-jis undecided)

> So UTF-8 is indeed ``pretty high'', but lower than the locale's
> default.

That seems to be the source of the problem.  utf-8 should always come
before latin-1 in that list, since utf-8 streams that are valid latin-1
streams are not uncommon, whereas latin-1 streams that are valid utf-8
streams are extremely rare.


        Stefan