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

[Eli Zaretskii]

> From: Chong Yidong <cyd@gnu.org>
> Date: Sun, 04 Nov 2012 02:00:05 +0800
> Cc: 12054@debbugs.gnu.org
> 
> "Drew Adams" <drew.adams@oracle.com> writes:
> 
> > So just what is the "most general read syntax for a char" now?
> 
> The literal representation of the character.  This should work on older
> Emacsen too, I think.

It doesn't, AFAIR: in Emacs before v23, an NBSP would be decoded into
a different internal representation depending on the encoding of the
file from which it is read.  That encoding could be explicit, using
the coding: cookie, or implicit, based on the current locale.  But in
any case, the result will only match NBSP in the same charset.  E.g.,
if \240 was decoded into a Latin-2 NBSP, it will not match a Latin-1
NBSP.