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bug#3452: 23.0.94; display
From: |
Eli Zaretskii |
Subject: |
bug#3452: 23.0.94; display |
Date: |
Mon, 08 Jun 2009 00:48:53 -0400 |
> From: Kenichi Handa <handa@m17n.org>
> Date: Mon, 08 Jun 2009 10:51:14 +0900
> Cc: 3452@emacsbugs.donarmstrong.com
> Reply-To: Kenichi Handa <handa@m17n.org>, 3452@emacsbugs.donarmstrong.com
>
> On terminal, if a zero-width character doesn't follow a base
> character, Emacs composes that character by prepending SPACE
> hoping that the terminal treats that zero-width character as
> zero-width too.
So these characters should be currently displayed as SPACE?
Is it a good idea to rely on the terminal in this situation? Do we
know for a fact that many (most?) terminals indeed behave like that
with zero-width characters?
> > These characters are not supposed to be displayed at all,
> > they have no meaningful glyphs to show them. They are just directives
> > to the bidirectional display engines about how to convert logical
> > order of characters to visual order.
>
> But as Emacs 23 doesn't support bidi, at least we should
> make it edittable, don't we?
Yes, definitely. (Btw, I think make them editable even when Emacs
does support bidirectional editing.)
> > Btw, I don't understand how these characters are related to
> > compositions. They should not be composed with anything, they always
> > stand for themselves.
>
> Currently they are not composed with any other surrounding
> characters (but only with an artificially prepended SPACE),
> so we can say that they stand for themselves.
That's good, I think.
> To conclude, I think there's not that much we can do for
> this situation. I think the current behaviour of
> gnome-terminal (displaying standalone U+202D as a space of
> width 1) is a bug.
If other terminals behave correctly, I would agree. But if not,
perhaps we need to work around this, if possible. For example, we
could have an entry in display tables for these characters.
- bug#3452: 23.0.94; display, Richard Stallman, 2009/06/02
- bug#3452: 23.0.94; display, Kenichi Handa, 2009/06/07
- bug#3452: 23.0.94; display,
Eli Zaretskii <=
- bug#3452: 23.0.94; display, Kenichi Handa, 2009/06/08
- bug#3452: 23.0.94; display, Eli Zaretskii, 2009/06/08
- bug#3452: 23.0.94; display, Kenichi Handa, 2009/06/08
- bug#3452: 23.0.94; display, Chong Yidong, 2009/06/08
- bug#3452: 23.0.94; display, Chong Yidong, 2009/06/09
- bug#3452: 23.0.94; display, Kenichi Handa, 2009/06/09