GNU bug report logs - #14616
24.3.50; Excessive cursor movement on non-X Emacs

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From: help-debbugs <at> gnu.org (GNU bug Tracking System)
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: tracker <at> debbugs.gnu.org
Subject: bug#14616: closed (24.3.50; Excessive cursor movement on non-X Emacs)
Date: Wed, 07 Aug 2013 13:52:02 +0000

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Your message dated Wed, 07 Aug 2013 16:51:12 +0300
with message-id <83haf1vcbz.fsf <at> gnu.org>
and subject line Re: bug#14616: 24.3.50; Excessive cursor movement on non-X Emacs
has caused the debbugs.gnu.org bug report #14616,
regarding 24.3.50; Excessive cursor movement on non-X Emacs
to be marked as done.

(If you believe you have received this mail in error, please contact
help-debbugs <at> gnu.org.)


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From: Lars Magne Ingebrigtsen <larsi <at> gnus.org>
To: bug-gnu-emacs <at> gnu.org
Subject: 24.3.50; Excessive cursor movement on non-X Emacs
Date: Fri, 14 Jun 2013 10:00:19 +0200

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I don't have a test case for this bug, I'm afraid, but here's what I'm
seeing:

I read mail and news while travelling by using a putty client on my
phone.  I ssh in to my home machine and have a screen there with an
Emacs running Gnus.

It seems like that when Emacs is doing network stuff (web/news), the
cursor is displayed momentarily visually at the first point in the
screen.  Then it's displayed momentarily at the first point in the echo
area.  Sometimes this repeats a few times.

Often the entire connection hangs while it's doing this -- I'm unable to
exit the screen for instance, so I suspect that Emacs is actually moving
the cursor back and forth between these two positions more rapidly than
my phone is able to display.

Once while this was happening, I got an SMS from my telco warning me
about large roaming data costs, which further points to this behaviour
generating a lot of data over the wire.

I have no idea how to start debugging this problem, but it's easily
reproducible for me.

It started happening about half a year ago.  Does anybody have any
inkling what might be causing this problem?  If not, I can try to see if
I can find a way to debug this.

Uhmn...

Oh, here's an strace from me typing `n' (next article) in Gnus four
times.  The second and fourth time this cursor-moving behaviour was
triggered:

[putty-trace (application/octet-stream, attachment)]

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In GNU Emacs 24.3.50.2 (x86_64-unknown-linux-gnu, GTK+ Version 2.24.10)
 of 2013-06-10 on stories
Bzr revision: 112902 eliz <at> gnu.org-20130609164907-osn6il65f0gn31s1
Windowing system distributor `The X.Org Foundation', version 11.0.10707000
System Description:	Debian GNU/Linux 7.0 (wheezy)

Important settings:
  value of $LANG: en_US
  locale-coding-system: iso-latin-1-unix
  default enable-multibyte-characters: t


-- 
(domestic pets only, the antidote for overdose, milk.)
  bloggy blog http://lars.ingebrigtsen.no/

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From: Eli Zaretskii <eliz <at> gnu.org>
To: Lars Magne Ingebrigtsen <larsi <at> gnus.org>
Cc: 14616-done <at> debbugs.gnu.org
Subject: Re: bug#14616: 24.3.50; Excessive cursor movement on non-X Emacs
Date: Wed, 07 Aug 2013 16:51:12 +0300

> From: Lars Magne Ingebrigtsen <larsi <at> gnus.org>
> Cc: 14616 <at> debbugs.gnu.org
> Date: Tue, 06 Aug 2013 22:32:14 +0200
> 
> Eli Zaretskii <eliz <at> gnu.org> writes:
> 
> > Does the change below help?
> 
> Yes, this seems to fix the problem for me.  Thanks!

Thanks, committed as trunk revision 113735.

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