GNU bug report logs - #8657
24.0.50; Emacs code that seems to use `*-single-char-property-change' incorrectly

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Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

From: "Drew Adams" <drew.adams <at> oracle.com>
To: <bug-gnu-emacs <at> gnu.org>
Subject: 24.0.50; Emacs code that seems to use `*-single-char-property-change'
	incorrectly
Date: Wed, 11 May 2011 13:54:57 -0700

`(next|previous)-single-char-property-change' behaves differently in a
couple of ways from `(next|previous)-single-property-change', besides
the difference of overlay vs text properties.
 
In particular, IIUC, the return value can never be nil.
Yet I see code such as this:
 
gnus-summary-show-thread:
(or (next-single-char-property-change end 'invisible) (point-max))
 
comint-next-prompt:
(setq pos (next-single-char-property-change pos 'field))
(cond (or (null pos)...
 
Isn't this incorrect?

In GNU Emacs 24.0.50.1 (i386-mingw-nt5.1.2600)
 of 2011-05-10 on 3249CTO
Windowing system distributor `Microsoft Corp.', version 5.1.2600
configured using `configure --with-gcc (4.5) --no-opt --cflags
-Ic:/build/include'
 

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