GNU bug report logs - #9496
24.0.50; Segfault on TAB-only composition

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Package: emacs;

Reported by: Johan Bockgård <bojohan <at> gnu.org>

Date: Tue, 13 Sep 2011 20:27:01 UTC

Severity: important

Merged with 9775

Found in versions 24.0.50, 24.0.90

Done: Chong Yidong <cyd <at> gnu.org>

Bug is archived. No further changes may be made.

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Message #57 received at 9496 <at> debbugs.gnu.org (full text, mbox):

From: Paul Eggert <eggert <at> cs.ucla.edu>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: 9496 <at> debbugs.gnu.org
Subject: Re: bug#9496: 24.0.50; Segfault on TAB-only composition
Date: Sun, 05 Feb 2012 08:39:45 -0800

On 02/05/2012 08:36 AM, Eli Zaretskii wrote:

>> If char-width returns a value that's arbitrarily ceilinged
>> at 1000, but actual characters can be wider than 1000 columns,
>> code that uses char-width to count columns will be buggy.
> 
> How can an actual character (not its display-table replacement) be
> wider than that?

By "actual character" I meant to include how the character is
displayed, since char-width measures display width.  So that
includes the display-table replacement if any.

>> We could address this by changing the code that renders characters,
>> so that the code limits them to at most 1000 columns on the display.
> 
> That was my intent, yes.

OK, that sounds reasonable.
This bug report was last modified 13 years and 170 days ago.

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