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From: Richard Stallman <rms@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: bug of display-table & make-glyph-code
Date: Sun, 09 Sep 2007 21:12:45 -0400
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Xref: news.gmane.org gmane.emacs.devel:78372
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    The number of bits left over in a glyph code for the face number
    is vastly reduced on the unicode-2 branch, so as soon as we
    merge that to the trunk, the problem will certainly be
    visible on trunk.

    The solution is to find some other way to merge a face with a
    char-code to make a glyph code.  We have discussed this some
    time ago.

I asked Handa if he could please work on this
in unicode-2.