GNU bug report logs - #12054
24.1; regression? font-lock no-break-space with nil nobreak-char-display

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From: Stefan Monnier <monnier <at> IRO.UMontreal.CA>
To: "Drew Adams" <drew.adams <at> oracle.com>
Cc: 'Eli Zaretskii' <eliz <at> gnu.org>, cyd <at> gnu.org, 12054 <at> debbugs.gnu.org
Subject: bug#12054: 24.1; regression? font-lock no-break-space with nil nobreak-char-display
Date: Sat, 03 Nov 2012 16:36:42 -0400

> OK, so then do you think this should DTRT?
> (font-lock-add-keywords nil '(("\\(\302\240\\)+" (0 'foo t))) 'APPEND)

That will match if your buffer contains a \302 byte or a \240 byte.
"contains" is different from "is represented internally".

The internal representation should normally stay hidden and only appear
if you use dangerous things like string-as-multibyte or call
set-buffer-multibyte in a non-empty buffer.

> I'm guessing it shouldn't, because IIUC the buffer in fact contains only the
> single raw byte \240 and not the multibyte sequence of two raw bytes \302 and
> \240.

AFAIK your buffer contains none of that.  It contains a NBSP character,
which is not a byte.


        Stefan

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