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From: Richard Stallman <rms@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: Changes 2009-07-15/16 in branch?
Date: Mon, 27 Jul 2009 13:41:04 -0400
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Cc: adrian.b.robert@gmail.com, emacs-devel@gnu.org, monnier@iro.umontreal.ca,
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To: YAMAMOTO Mitsuharu <mituharu@math.s.chiba-u.ac.jp>
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In-reply-to: <wltz0yke0h.wl%mituharu@math.s.chiba-u.ac.jp> (message from
	YAMAMOTO Mitsuharu on Mon, 27 Jul 2009 12:20:46 +0900)
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Xref: news.gmane.org gmane.emacs.devel:113237
Archived-At: <http://permalink.gmane.org/gmane.emacs.devel/113237>

    What I'm concerning about with respect to the GNU policy is the
    "alpha-component" (or maybe "alpha-channel" is more familiar) support,
    which was added only for Cocoa.  Alpha-component/alpha-channel
    controls translucency of colors by specifying how opaque it is.

Is this a feature users might actually want to use?
I don't see what it is good for.
Can someone explain what a user might want to do with this?