GNU bug report logs - #12867
24.3.50; easy-to-repro crash involving mode line

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Package: emacs;

Reported by: "Drew Adams" <drew.adams <at> oracle.com>

Date: Mon, 12 Nov 2012 03:53:01 UTC

Severity: normal

Found in version 24.3.50

Done: Glenn Morris <rgm <at> gnu.org>

Bug is archived. No further changes may be made.

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From: martin rudalics <rudalics <at> gmx.at>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: 12867 <at> debbugs.gnu.org, Drew Adams <drew.adams <at> oracle.com>
Subject: bug#12867: 24.3.50; easy-to-repro crash involving mode line
Date: Mon, 12 Nov 2012 18:31:53 +0100

> The need to redisplay the mode line on every move of point is a killer
> of many redisplay optimizations.  It is also potentially expensive by
> itself, because it requires Emacs to count lines, something that is
> not an easy operation in Emacs, which sees the buffer text as a linear
> array of characters, not a series of lines.  So the display engine
> tries very hard to avoid redisplaying the mode line if it decides that
> the line number does not need to appear.

I think it would make sense to use a cache for maintaining line numbers.

martin
This bug report was last modified 12 years and 242 days ago.

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