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Re: tabulated-list-init-header and glyphless-char-display

From: Chong Yidong
Subject: Re: tabulated-list-init-header and glyphless-char-display
Date: 2011年4月10日 11:47:58 -0400
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/23.1 (gnu/linux) 
Eli Zaretskii <address@hidden> writes:
>> Hmm... so IIUC we distinguish between "glyphless" and "without a font".
>> Where do we explain the difference between the two, and is there a good
>> reason to distinguish the two cases?
>
> No, "glyphless" and "without a font" are (and should be) synonyms.
> Except that on a text terminal, "without a font" means "cannot be
> encoded for the current terminal encoding".
That's apparently not how glyphless-char-display works. The docstring
is a bit ambiguous, but glyphless-char-display actually *defines* the
characters that cannot be displayed in an ordinary way. For instance,
if you do (aset glyphless-char-display ?a 'empty-box), that tells Emacs
that "a" is a glyphless character, and causes all "a"'s to be displayed
as empty boxes.
What you are thinking of is a char table that says "how should we
display character C if it has no font", but AFAICT there is currently no
such facility. There is only the extra slot of glyphless-char-display,
which handles all characters with no font without discriminating.
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