GNU bug report logs - #32922
Echo area flickers when receiving data in network process

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Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

From: Mitchell Plamann <mplamann <at> janestreet.com>
To: bug-gnu-emacs <at> gnu.org
Subject: Echo area flickers when receiving data in network process
Date: Wed, 3 Oct 2018 13:57:15 -0400

[Message part 1 (text/plain, inline)]

Steps to reproduce:
  - Open "emacs -Q"
  - Eval (make-network-process :name "foo" :server t :service 8080 :family
'ipv4)
  - Press "C-x 5". After a few seconds, the echo area will display "C-x 5-".
  - In another terminal, run "yes | nc localhost 8080"
  - The "5-" in the echo area will begin to flicker.

I've tested this in emacs 25.3 and 26.1.

As far as I've been able to tell, the data coming in to the network process
triggers [read_key_sequence] in [keyboard.c] to replay the "C-x 5"
sequence. As part of this replay, it outputs "C-x", then "C-x 5", then "C-x
5-" to the echo area, which causes the "5-" to look like it is flickering.

[Message part 2 (text/html, inline)]

Message #8 received at 32922 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: Mitchell Plamann <mplamann <at> janestreet.com>
Cc: 32922 <at> debbugs.gnu.org
Subject: Re: bug#32922: Echo area flickers when receiving data in network
 process
Date: Wed, 03 Oct 2018 21:49:56 +0300

> From: Mitchell Plamann <mplamann <at> janestreet.com>
> Date: Wed, 3 Oct 2018 13:57:15 -0400
> 
> Steps to reproduce:
>   - Open "emacs -Q"
>   - Eval (make-network-process :name "foo" :server t :service 8080 :family 'ipv4)
>   - Press "C-x 5". After a few seconds, the echo area will display "C-x 5-".
>   - In another terminal, run "yes | nc localhost 8080"
>   - The "5-" in the echo area will begin to flicker.
> 
> I've tested this in emacs 25.3 and 26.1.
> 
> As far as I've been able to tell, the data coming in to the network process triggers [read_key_sequence] in
> [keyboard.c] to replay the "C-x 5" sequence. As part of this replay, it outputs "C-x", then "C-x 5", then "C-x 5-"
> to the echo area, which causes the "5-" to look like it is flickering.

This is deliberate, the code is explicitly written to replay the key
sequence.  For more about this, see

  http://lists.gnu.org/archive/html/emacs-devel/2018-09/msg00906.html

Message #11 received at 32922 <at> debbugs.gnu.org (full text, mbox):

From: Stefan Kangas <stefan <at> marxist.se>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: 32922 <at> debbugs.gnu.org, Mitchell Plamann <mplamann <at> janestreet.com>
Subject: Re: bug#32922: Echo area flickers when receiving data in network
 process
Date: Thu, 3 Oct 2019 03:07:30 +0200

tags 32922 + notabug
close 32922

Eli Zaretskii <eliz <at> gnu.org> writes:

>> From: Mitchell Plamann <mplamann <at> janestreet.com>
>> Date: Wed, 3 Oct 2018 13:57:15 -0400
>>
>> Steps to reproduce:
>>   - Open "emacs -Q"
>>   - Eval (make-network-process :name "foo" :server t :service 8080 :family 'ipv4)
>>   - Press "C-x 5". After a few seconds, the echo area will display "C-x 5-".
>>   - In another terminal, run "yes | nc localhost 8080"
>>   - The "5-" in the echo area will begin to flicker.
>>
>> I've tested this in emacs 25.3 and 26.1.
>>
>> As far as I've been able to tell, the data coming in to the network process triggers [read_key_sequence] in
>> [keyboard.c] to replay the "C-x 5" sequence. As part of this replay, it outputs "C-x", then "C-x 5", then "C-x 5-"
>> to the echo area, which causes the "5-" to look like it is flickering.
>
> This is deliberate, the code is explicitly written to replay the key
> sequence.  For more about this, see
>
>   http://lists.gnu.org/archive/html/emacs-devel/2018-09/msg00906.html

Since this is intended behaviour, I'm closing this as notabug.

Best regards,
Stefan Kangas

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