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

From: Drew Adams
Subject: bug#12054: 24.1; regression? font-lock no-break-space with nil nobreak-char-display
Date: Wed, 25 Jul 2012 22:43:29 -0700

emacs -Q
(defface foo '((t (:background "Yellow"))) "" :group 'faces)

(setq nobreak-char-display nil)

(font-lock-add-keywords nil '(("[\240]+" (0 'foo t))) 'APPEND)
Insert a no-break space:
C-x 8 RET no-break-space (or C-q 240 RET)
Turn font-lock-mode off, then back on.
With point before the no-break-space, C-u C-x =.  That shows that the
character is indeed a no-break-space, and there is no face on it.
In Emacs 22, the char is shown clearly in face foo.  Am I missing
The same recipe with non-breaking-hyphen highlights that character fine.
What is different about no-break-space?  Shouldn't it be treated
similarly?  This works in Emacs 22 but stops working in Emacs 23.
Normal?  Regression?

In GNU Emacs 24.1.1 (i386-mingw-nt5.1.2600)
 of 2012-06-10 on MARVIN
Windowing system distributor `Microsoft Corp.', version 5.1.2600
Configured using:
 `configure --with-gcc (4.6) --cflags

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