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bug#6974: Emacs doesn't like Swedish ä (on w32)

From: Andreas Röhler
Subject: bug#6974: Emacs doesn't like Swedish ä (on w32)
Date: Fri, 03 Sep 2010 18:23:33 +0200
User-agent: Mozilla/5.0 (X11; U; Linux i686; de; rv: Gecko/20100711 Thunderbird/3.0.6

Am 03.09.2010 15:49, schrieb Eli Zaretskii:
Date: Fri, 03 Sep 2010 11:46:00 +0200
From: Andreas Röhler<address@hidden>
CC: address@hidden

The most probable reason for Emacs not to decode the file correctly
(as UTF-8) is that the file includes some bytes that are invalid UTF-8
sequences.  What happens if you force UTF-8 with "C-x RET c" before
visiting the file with "C-x C-f"?

All fine at the first glance than.

However, re-opening the newly saved buffer repeats the wrong display.

Sure, because the problem that caused Emacs to decode the file as
raw-text is still in the file.

Also when saving, it always prompts for coding-system, suggests raw-text

Expected, since there are problematic characters in the file.  Try

  M-: (unencodable-char-position (point-min) (point-max) 'utf-8) RET

It should show you the first position in the buffer where you have a
character that cannot be encoded by UTF-8.  If all the characters can
be encoded by UTF-8, this will evaluate to nil.

With buffer narrowed to the code from screen-shot it says:

3993 (#o7631, #xf99)

Setting buffer-file-coding-system explicitly to utf-8-unix, followed by
a save, doesn't change the wrong display after new opening.

And it shouldn't.

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