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bug#8657: 24.0.50; Emacs code that seems to use `*-single-char-property-

From: Katsumi Yamaoka
Subject: bug#8657: 24.0.50; Emacs code that seems to use `*-single-char-property-change' incorrectly
Date: Tue, 07 Feb 2012 07:56:54 +0900
User-agent: Gnus/5.130002 (真 Gnus v0.2) Emacs/24.0.93 (i686-pc-cygwin)

Chong Yidong wrote:
> Eli Zaretskii <eliz@gnu.org> writes:
>>> The behavior might have changed at some point in time, explaining the
>>> above code.
>> Or maybe the author was confusing next-single-char-property-change
>> with next-single-property-change.
>> In any case, those tests are redundant, because
>> next-single-char-property-change already returns point-max when it
>> finds no change in properties.

> I went ahead and fixed them accordingly.

But in XEmacs next-single-char-property-change will return nil
if no property change is found.  So I've modified the gnus-sum.el
code into:

  (if (featurep 'xemacs)
      (or (next-single-char-property-change end 'invisible)
    (next-single-char-property-change end 'invisible))

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