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From: Richard Stallman <rms@gnu.org>
Newsgroups: gmane.emacs.bugs
Subject: Re: whitespace includes U+3000
Date: Tue, 27 Jun 2006 06:34:41 -0400
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    > Are emacs whitespace detectors aware of Unicode characters like
    > U+3000?

    No.  The current Emacs treat only TAB and SPACE as
    "whitespace" characters.

It would be very easy to fix this by setting the syntax table entries
for those characters--if there are not too many of them.  So why not
fix it?