GNU bug report logs -
#15045
Point jumps inappropriately around time of Semantic lexing
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Message #155 received at 15045 <at> debbugs.gnu.org (full text, mbox):
> From: David Engster <deng <at> randomsample.de>
> Cc: gundaetiapo <at> gmail.com, monnier <at> iro.umontreal.ca, 15045 <at> debbugs.gnu.org, eric <at> siege-engine.com
> Date: Sat, 10 Aug 2013 11:54:32 +0200
>
> Eli Zaretskii writes:
> >> From: David Engster <deng <at> randomsample.de>
> >> Yes. But it shows that this bug is easy to make, and it's hard to track
> >> down.
> >
> > It is also very rare.
>
> I don't think the bug is rare. I do think that this bug being triggered
> is rare, since we don't have many non-idle timers in Emacs that trigger
> redisplay
The last sentence exactly means that the bug is rare.
> (are there others in Emacs core besides the display-time event
> handler?).
And so does this.
> It might be fun to work for a while with a dummy timer which
> triggers redisplay once a second or so.
Customize display-time-interval to 1 (after restoring the sit-for that
got deleted), and you've got that. I'm running for years with that
variable customized to 5 sec, and never saw any unwarranted movement
of point or scrolling. That's "rare" in my book.
> I also think this bug is seldomly reported because it's impossible to
> give a recipe if you don't know that it is a timer that triggers it
> (which is why I never bothered to report the bug in speck-mode).
The bug database is replete with problems that are not reproducible,
so I'm quite sure people would report them regardless.
This bug report was last modified 11 years and 193 days ago.
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