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Re: Display question
From: |
Michael Welsh Duggan |
Subject: |
Re: Display question |
Date: |
Wed, 08 Jun 2011 09:13:20 -0400 |
User-agent: |
Gnus/5.110018 (No Gnus v0.18) Emacs/24.0.50 (gnu/linux) |
Eli Zaretskii <address@hidden> writes:
>> From: Michael Welsh Duggan <address@hidden>
>> Date: Wed, 08 Jun 2011 01:55:54 -0400
>>
>> Afterward, I get a character that looks like a double-boxed RLO. Image
>> included:
>>
>> Is this expected? If I just do (insert RLO RLO RLO) a few times in a
>> non-font-locked buffer, I get a box around RLO, with a tiny space
>> between the boxes, and not the double box seen here.
>
> The difference between these two use cases is that characters
> delivered from display tables are not subject to the treatment we give
> to "glyphless characters", which is what u+200b ZERO WIDTH SPACE is.
> You expect this character to be displayed as a thin space (probably to
> get the boxed "RLO" look prettier), but this thin space will only show
> when u+200b is treated as a glyphless character, which can happen when
> it comes from the buffer, but not from a display table.
[...]
> Btw, you cannot expect that u+200b is displayed as a thin space,
> because the user could change that via glyphless-char-display-control,
> which see. So this particular use of u+200b is questionable to begin
> with, IMO.
I wasn't actually thinking it would appear as a space when I initially
tried it. I was using it to separate two runs of character properties
so the boxes wouldn't join if they were next to each other. (This does
and does not work if I set u+200b to zero-width. I think this confuses
the display mechanism a little.) I did not know about
glyphless-char-display, which seems to have the feature I was trying to
implement built in. Thanks for the help.
(I was playing around with ideas on how to display and undisplay bidi control
characters, as you might have guessed.)
--
Michael Welsh Duggan
(address@hidden)