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Re: Error during redisplay
From: |
Richard Stallman |
Subject: |
Re: Error during redisplay |
Date: |
Wed, 27 Feb 2008 11:07:54 -0500 |
The current design requires to add `composition' property to
a string to properly display the string if it contains, for
instance, some of Indic characters, and to add
`auto-composed' property to avoid the repeated generation of
`composition' property.
It seems unclean to modify a string just because it gets used for
redisplay. We do that for fontification, but that's an explicit
add-on feature which is not part of mere correct display of some text.
What happens with a read-only buffer? Does auto-composition modify
the read-only buffer, or does the text display wrong?
If mode-line-format has not been modified, I think it
doesn't contain any characters that require composition
(except for the case that we support such ligatures as "Fi"
in the future). One way is to check if the string contains
any such characters, and if not, avoid any composition
processing. As the string tends to be short, doing that
check repeatedly will not be that inefficient.
That sounds like a good fix for this case, but it may not fix
the whole problem.
> If they SHOULD have these properties, probably we should make sure they
have
> these properties from the start, or from an early point in building Emacs.
That's impossible. How to compose them depends on which
font to use.
Does this mean that redisplaying with different fonts
will keep changing the composition properties in one string
back and forth between different values?
- Re: Error during redisplay, (continued)
- Re: Error during redisplay, Stefan Monnier, 2008/02/25
- Re: Error during redisplay, Richard Stallman, 2008/02/26
- Re: Error during redisplay, Kenichi Handa, 2008/02/26
- Re: Error during redisplay, David Kastrup, 2008/02/27
- Re: Error during redisplay, Kenichi Handa, 2008/02/27
- Re: Error during redisplay, David Kastrup, 2008/02/27
- Re: Error during redisplay, Richard Stallman, 2008/02/27
- Re: Error during redisplay, Stefan Monnier, 2008/02/27
- Re: Error during redisplay, Kenichi Handa, 2008/02/28
- Re: Error during redisplay, Stefan Monnier, 2008/02/28
- Re: Error during redisplay,
Richard Stallman <=
Error during redisplay, Bob Rogers, 2008/02/26