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From: Eli Zaretskii <eliz@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: tabulated-list-init-header and glyphless-char-display
Date: Fri, 08 Apr 2011 20:17:44 +0300
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tabulated-list-init-header assumes without testing that u+25b2 and
u+25bc will be displayed as themselves.  But with various values of
glyphless-char-display-control, this may not be true.  Also, on text
terminals these characters generally cannot be displayed, which makes
the entire header line ugly, if not bug-like.