GNU bug report logs - #11697
24.1.50; ERC scroll-to-bottom functionality 'broken' in emacs 24.1.x

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

From: Brian Fransioli <assem <at> terranpro.org>
To: bug-gnu-emacs <at> gnu.org
Subject: 24.1.50; ERC scroll-to-bottom functionality 'broken' in emacs 24.1.x
Date: Thu, 14 Jun 2012 01:22:09 +0900

After updating to emacs 24.1.x I noticed ERC scroll functionality
changed.  Originally, it would recenter to force the prompt to be near
the bottom of the screen (according to `erc-input-line-position').  Now,
this recentering only happens when I enter text, or perform a mouse
event.  Channel joins/parts and new messages hit the bottom of the
screen, and recentering moves the bottom line to the center of the
buffer.

The overall effect is input by the user moves the screen to the bottom,
while channel/server inputs bounce around from middle to bottom and back
again.

Looking in erc-goodies.el at `erc-add-scroll-bottom', it's easy to see
the documentation is also out of date.  It states it uses
`window-scroll-functions' but instead adds the hook to
`post-command-hook'.

Examining commits, I found the culprit:

commit:
a1d63e03c3eda51dcec158d6027adf9dbdcfd8dd

view changes via git emacs web:
http://git.savannah.gnu.org/cgit/emacs.git/commit/lisp/erc/erc-goodies.el?id=a1d63e03c3eda51dcec158d6027adf9dbdcfd8dd


I see that the changes were reported to fix a bug on tty's, but the
results are severe motion sickness for even moderately chatty channels.

Reproduce by:
(erc-scrolltobottom-mode)
(setq erc-input-line-position -2)

Regards,
Brian

=====

In GNU Emacs 24.1.50.1 (i686-pc-linux-gnu, GTK+ Version 2.20.1)
 of 2012-06-13 on pringles
Bzr revision: 108574 rgm <at> gnu.org-20120612101728-uysxmgrcvjbitpp9
Windowing system distributor `NetSarang Computer, Inc.', version 11.0.4004
Important settings:
  value of $LANG: en_US.UTF-8
  locale-coding-system: utf-8-unix
  default enable-multibyte-characters: t

Major mode: ERC

Minor modes in effect:
  erc-list-mode: t
  erc-menu-mode: t
  erc-autojoin-mode: t
  erc-ring-mode: t
  erc-networks-mode: t
  erc-track-mode: t
  erc-track-minor-mode: t
  erc-match-mode: t
  erc-button-mode: t
  erc-fill-mode: t
  erc-stamp-mode: t
  erc-netsplit-mode: t
  erc-pcomplete-mode: t
  yas/global-mode: t
  yas/minor-mode: t
  erc-irccontrols-mode: t
  erc-noncommands-mode: t
  erc-move-to-prompt-mode: t
  erc-readonly-mode: t
  which-function-mode: t
  ido-everywhere: t
  tooltip-mode: t
  mouse-wheel-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  blink-cursor-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  column-number-mode: t
  line-number-mode: t
  transient-mark-mode: t

Recent messages:
Type C-x 1 to delete the help window.
Quit
mouse-2, RET: find variable's definition
Loading cc-langs...done
Loading semanticdb-file...done [2 times]
Loading vc-bzr...done [5 times]
Making completion list...
Quit [2 times]
Mark set
Quit
Quit

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Features:
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dynamic-setting system-font-setting font-render-setting move-toolbar gtk
x-toolkit x multi-tty emacs)

Message #8 received at 11697 <at> debbugs.gnu.org (full text, mbox):

From: Deniz Dogan <deniz <at> dogan.se>
To: Brian Fransioli <assem <at> terranpro.org>
Cc: 11697 <at> debbugs.gnu.org
Subject: Re: bug#11697: 24.1.50; ERC scroll-to-bottom functionality 'broken'
	in emacs 24.1.x
Date: Wed, 13 Jun 2012 22:03:00 +0200

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

On 2012-06-13 18:22,, Brian Fransioli wrote:
>
> After updating to emacs 24.1.x I noticed ERC scroll functionality
> changed.  Originally, it would recenter to force the prompt to be near
> the bottom of the screen (according to `erc-input-line-position').  Now,
> this recentering only happens when I enter text, or perform a mouse
> event.  Channel joins/parts and new messages hit the bottom of the
> screen, and recentering moves the bottom line to the center of the
> buffer.
>
> The overall effect is input by the user moves the screen to the bottom,
> while channel/server inputs bounce around from middle to bottom and back
> again.
>
> Looking in erc-goodies.el at `erc-add-scroll-bottom', it's easy to see
> the documentation is also out of date.  It states it uses
> `window-scroll-functions' but instead adds the hook to
> `post-command-hook'.
>
> Examining commits, I found the culprit:
>
> commit:
> a1d63e03c3eda51dcec158d6027adf9dbdcfd8dd
>
> view changes via git emacs web:
> http://git.savannah.gnu.org/cgit/emacs.git/commit/lisp/erc/erc-goodies.el?id=a1d63e03c3eda51dcec158d6027adf9dbdcfd8dd
>
>
> I see that the changes were reported to fix a bug on tty's, but the
> results are severe motion sickness for even moderately chatty channels.
>
> Reproduce by:
> (erc-scrolltobottom-mode)
> (setq erc-input-line-position -2)
>
> Regards,
> Brian
>

Firstly, I agree with you completely that scrolltobottom needs 
improvements.  I can't be sure why they changed the behavior, since the 
new method is clearly inferior, but I believe it's because 
window-scroll-functions is never meant to change "the way the window is 
scrolled".

I've monkey-patched ERC myself to handle the whole thing better.  I've 
attached the Lisp.  Just evaluate all the code and you'll be all set. 
(I know it's not production-quality code, but it does the job and 
relieves you from ever thinking about it again.)

Deniz

[erc-better-scroll.el (text/plain, attachment)]

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

From: Kevin Rodgers <kevin.d.rodgers <at> gmail.com>
To: bug-gnu-emacs <at> gnu.org
Subject: Re: bug#11697: 24.1.50; ERC scroll-to-bottom functionality 'broken'
	in emacs 24.1.x
Date: Thu, 14 Jun 2012 01:35:15 -0600

On 6/13/12 2:03 PM, Deniz Dogan wrote:
...
> (I know it's not
> production-quality code, but it does the job and relieves you from ever thinking
> about it again.)

Hah!

-- 
Kevin Rodgers
Denver, Colorado, USA

Message #14 received at submit <at> debbugs.gnu.org (full text, mbox):

From: Antoine Levitt <antoine.levitt <at> gmail.com>
To: bug-gnu-emacs <at> gnu.org
Subject: Re: bug#11697: 24.1.50;
	ERC scroll-to-bottom functionality 'broken' in emacs 24.1.x
Date: Thu, 14 Jun 2012 11:49:13 +0200

13/06/12 22:03, Deniz Dogan
> On 2012-06-13 18:22,, Brian Fransioli wrote:
>>
>> After updating to emacs 24.1.x I noticed ERC scroll functionality
>> changed.  Originally, it would recenter to force the prompt to be near
>> the bottom of the screen (according to `erc-input-line-position').  Now,
>> this recentering only happens when I enter text, or perform a mouse
>> event.  Channel joins/parts and new messages hit the bottom of the
>> screen, and recentering moves the bottom line to the center of the
>> buffer.
>>
>> The overall effect is input by the user moves the screen to the bottom,
>> while channel/server inputs bounce around from middle to bottom and back
>> again.
>>
>> Looking in erc-goodies.el at `erc-add-scroll-bottom', it's easy to see
>> the documentation is also out of date.  It states it uses
>> `window-scroll-functions' but instead adds the hook to
>> `post-command-hook'.
>>
>> Examining commits, I found the culprit:
>>
>> commit:
>> a1d63e03c3eda51dcec158d6027adf9dbdcfd8dd
>>
>> view changes via git emacs web:
>> http://git.savannah.gnu.org/cgit/emacs.git/commit/lisp/erc/erc-goodies.el?id=a1d63e03c3eda51dcec158d6027adf9dbdcfd8dd
>>
>>
>> I see that the changes were reported to fix a bug on tty's, but the
>> results are severe motion sickness for even moderately chatty channels.
>>
>> Reproduce by:
>> (erc-scrolltobottom-mode)
>> (setq erc-input-line-position -2)
>>
>> Regards,
>> Brian
>>
>
> Firstly, I agree with you completely that scrolltobottom needs
> improvements.  I can't be sure why they changed the behavior, since
> the new method is clearly inferior, but I believe it's because
> window-scroll-functions is never meant to change "the way the window
> is scrolled".

Hi,

I'm responsible for the mess. Sorry, I don't customize
erc-input-line-position, and it didn't occur to me that it might mess
things up. I tried to think of something better for erc-scrolltobottom,
but I'm not familiar with erc internals and that was the best I could
do. The reason for the change was that as you said,
window-scroll-functions is not intended to be used like that, and it
caused weird bugs.

> I've monkey-patched ERC myself to handle the whole thing better.  I've
> attached the Lisp.  Just evaluate all the code and you'll be all
> set. (I know it's not production-quality code, but it does the job and
> relieves you from ever thinking about it again.)

Great! Could you submit a proper patch, so that Someone (tm; there seems
to be a lack of maintainers for ERC) can review it and merge it into
trunk? erc-scrolltobottom has been broken for years, with weird bugs and
excessive CPU consumption, and it's high time it changed.

Message #17 received at 11697 <at> debbugs.gnu.org (full text, mbox):

From: Deniz Dogan <deniz <at> dogan.se>
To: Antoine Levitt <antoine.levitt <at> gmail.com>
Cc: 11697 <at> debbugs.gnu.org
Subject: Re: bug#11697: 24.1.50; ERC scroll-to-bottom functionality 'broken'
	in emacs 24.1.x
Date: Thu, 14 Jun 2012 22:51:08 +0200

On 2012-06-14 11:49,, Antoine Levitt wrote:
> 13/06/12 22:03, Deniz Dogan
>> On 2012-06-13 18:22,, Brian Fransioli wrote:
>>>
>>> After updating to emacs 24.1.x I noticed ERC scroll functionality
>>> changed.  Originally, it would recenter to force the prompt to be near
>>> the bottom of the screen (according to `erc-input-line-position').  Now,
>>> this recentering only happens when I enter text, or perform a mouse
>>> event.  Channel joins/parts and new messages hit the bottom of the
>>> screen, and recentering moves the bottom line to the center of the
>>> buffer.
>>>
>>> The overall effect is input by the user moves the screen to the bottom,
>>> while channel/server inputs bounce around from middle to bottom and back
>>> again.
>>>
>>> Looking in erc-goodies.el at `erc-add-scroll-bottom', it's easy to see
>>> the documentation is also out of date.  It states it uses
>>> `window-scroll-functions' but instead adds the hook to
>>> `post-command-hook'.
>>>
>>> Examining commits, I found the culprit:
>>>
>>> commit:
>>> a1d63e03c3eda51dcec158d6027adf9dbdcfd8dd
>>>
>>> view changes via git emacs web:
>>> http://git.savannah.gnu.org/cgit/emacs.git/commit/lisp/erc/erc-goodies.el?id=a1d63e03c3eda51dcec158d6027adf9dbdcfd8dd
>>>
>>>
>>> I see that the changes were reported to fix a bug on tty's, but the
>>> results are severe motion sickness for even moderately chatty channels.
>>>
>>> Reproduce by:
>>> (erc-scrolltobottom-mode)
>>> (setq erc-input-line-position -2)
>>>
>>> Regards,
>>> Brian
>>>
>>
>> Firstly, I agree with you completely that scrolltobottom needs
>> improvements.  I can't be sure why they changed the behavior, since
>> the new method is clearly inferior, but I believe it's because
>> window-scroll-functions is never meant to change "the way the window
>> is scrolled".
>
> Hi,
>
> I'm responsible for the mess. Sorry, I don't customize
> erc-input-line-position, and it didn't occur to me that it might mess
> things up. I tried to think of something better for erc-scrolltobottom,
> but I'm not familiar with erc internals and that was the best I could
> do. The reason for the change was that as you said,
> window-scroll-functions is not intended to be used like that, and it
> caused weird bugs.
>
>> I've monkey-patched ERC myself to handle the whole thing better.  I've
>> attached the Lisp.  Just evaluate all the code and you'll be all
>> set. (I know it's not production-quality code, but it does the job and
>> relieves you from ever thinking about it again.)
>
> Great! Could you submit a proper patch, so that Someone (tm; there seems
> to be a lack of maintainers for ERC) can review it and merge it into
> trunk? erc-scrolltobottom has been broken for years, with weird bugs and
> excessive CPU consumption, and it's high time it changed.
>

The excessive CPU consumption comes from the fact that it nowadays uses 
post-command-hook, which is executed just about all the time.  :)

Unfortunately, my patch (ab)uses window-scroll-functions, so it's really 
no better than the way ERC was before.

Message #20 received at 11697 <at> debbugs.gnu.org (full text, mbox):

From: Antoine Levitt <antoine.levitt <at> gmail.com>
To: Deniz Dogan <deniz <at> dogan.se>
Cc: 11697 <at> debbugs.gnu.org
Subject: Re: bug#11697: 24.1.50;
	ERC scroll-to-bottom functionality 'broken' in emacs 24.1.x
Date: Thu, 14 Jun 2012 23:03:46 +0200

14/06/12 22:51, Deniz Dogan
>>> Firstly, I agree with you completely that scrolltobottom needs
>>> improvements.  I can't be sure why they changed the behavior, since
>>> the new method is clearly inferior, but I believe it's because
>>> window-scroll-functions is never meant to change "the way the window
>>> is scrolled".
>>
>> Hi,
>>
>> I'm responsible for the mess. Sorry, I don't customize
>> erc-input-line-position, and it didn't occur to me that it might mess
>> things up. I tried to think of something better for erc-scrolltobottom,
>> but I'm not familiar with erc internals and that was the best I could
>> do. The reason for the change was that as you said,
>> window-scroll-functions is not intended to be used like that, and it
>> caused weird bugs.
>>
>>> I've monkey-patched ERC myself to handle the whole thing better.  I've
>>> attached the Lisp.  Just evaluate all the code and you'll be all
>>> set. (I know it's not production-quality code, but it does the job and
>>> relieves you from ever thinking about it again.)
>>
>> Great! Could you submit a proper patch, so that Someone (tm; there seems
>> to be a lack of maintainers for ERC) can review it and merge it into
>> trunk? erc-scrolltobottom has been broken for years, with weird bugs and
>> excessive CPU consumption, and it's high time it changed.
>>
>
> The excessive CPU consumption comes from the fact that it nowadays
> uses post-command-hook, which is executed just about all the time.  :)

I don't think so, I had excessive CPU consumption before the code used
post-command-hook (main way to trigger is to hold a random key down
while watching the result of top. It's already appalling in ERC without
erc-scrolltobottom, but it's even worth with it).

The way I see it, this scrolltobottom thing is a problem that is global
to emacs and has nothing to do with ERC in particular. For instance, I
also want my shell buffers not to scroll past the end of
buffers. Actually I think (but am not sure ; it would require testing)
I'd want all buffers to behave that way, and never, ever display
anything past the end of the buffer. An ideal solution would be a local
variable, that'd inhibit "bad" recentering (and therefore would not
incur any performance loss, as I believe the main loss is when a hook
recenters after it has already been recentered). But that's more
ambitious.

Message #23 received at 11697 <at> debbugs.gnu.org (full text, mbox):

From: Deniz Dogan <deniz <at> dogan.se>
To: Antoine Levitt <antoine.levitt <at> gmail.com>
Cc: 11697 <at> debbugs.gnu.org
Subject: Re: bug#11697: 24.1.50; ERC scroll-to-bottom functionality 'broken'
	in emacs 24.1.x
Date: Thu, 14 Jun 2012 23:10:26 +0200

On 2012-06-14 23:03,, Antoine Levitt wrote:
> 14/06/12 22:51, Deniz Dogan
>> The excessive CPU consumption comes from the fact that it nowadays
>> uses post-command-hook, which is executed just about all the time.  :)
>
> I don't think so, I had excessive CPU consumption before the code used
> post-command-hook (main way to trigger is to hold a random key down
> while watching the result of top. It's already appalling in ERC without
> erc-scrolltobottom, but it's even worth with it).
>
> The way I see it, this scrolltobottom thing is a problem that is global
> to emacs and has nothing to do with ERC in particular. For instance, I
> also want my shell buffers not to scroll past the end of
> buffers. Actually I think (but am not sure ; it would require testing)
> I'd want all buffers to behave that way, and never, ever display
> anything past the end of the buffer. An ideal solution would be a local
> variable, that'd inhibit "bad" recentering (and therefore would not
> incur any performance loss, as I believe the main loss is when a hook
> recenters after it has already been recentered). But that's more
> ambitious.
>

I agree.  Another improvement, especially for IRC clients, would be to 
allow for buffers to start growing from the bottom of the window, much 
like Irssi and mIRC.

Message #26 received at 11697 <at> debbugs.gnu.org (full text, mbox):

From: Stefan Monnier <monnier <at> iro.umontreal.ca>
To: Antoine Levitt <antoine.levitt <at> gmail.com>
Cc: 11697 <at> debbugs.gnu.org, Deniz Dogan <deniz <at> dogan.se>
Subject: Re: bug#11697: 24.1.50;
	ERC scroll-to-bottom functionality 'broken' in emacs 24.1.x
Date: Thu, 14 Jun 2012 22:00:52 -0400

> to emacs and has nothing to do with ERC in particular. For instance, I
> also want my shell buffers not to scroll past the end of
> buffers. Actually I think (but am not sure ; it would require testing)
> I'd want all buffers to behave that way, and never, ever display
> anything past the end of the buffer.

How 'bout setting scroll-conservatively to 1000?


        Stefan

Message #29 received at 11697 <at> debbugs.gnu.org (full text, mbox):

From: Antoine Levitt <antoine.levitt <at> gmail.com>
To: Stefan Monnier <monnier <at> iro.umontreal.ca>
Cc: 11697 <at> debbugs.gnu.org, Deniz Dogan <deniz <at> dogan.se>
Subject: Re: bug#11697: 24.1.50;
	ERC scroll-to-bottom functionality 'broken' in emacs 24.1.x
Date: Fri, 15 Jun 2012 08:49:43 +0200

15/06/12 04:00, Stefan Monnier
>> to emacs and has nothing to do with ERC in particular. For instance, I
>> also want my shell buffers not to scroll past the end of
>> buffers. Actually I think (but am not sure ; it would require testing)
>> I'd want all buffers to behave that way, and never, ever display
>> anything past the end of the buffer.
>
> How 'bout setting scroll-conservatively to 1000?
>
>
>         Stefan

Even with scroll-conservatively, there are situations where the
centering displays stuff after the buffer end, by playing around with
C-v / M-v. Another way is to find a file, M->, then C-x 2 and C-x
1. There's a lot of other ways. This is in contrast with most
editors/browsers, which don't allow you to scroll past the end of the
buffer, ever. I'm not 100% sure whether I want that behavior for emacs
generally. However, I do want it for ERC / shells.

Message #32 received at 11697 <at> debbugs.gnu.org (full text, mbox):

From: maden.ldm <at> gmail.com
To: gnu.emacs.bug <at> googlegroups.com
Cc: 11697 <at> debbugs.gnu.org, Stefan Monnier <monnier <at> iro.umontreal.ca>
Subject: Re: bug#11697: 24.1.50; ERC scroll-to-bottom functionality 'broken'
	in emacs 24.1.x
Date: Thu, 7 Feb 2013 21:06:09 -0800 (PST)

On Friday, June 15, 2012 2:49:43 AM UTC-4, Antoine Levitt wrote:
> 15/06/12 04:00, Stefan Monnier
> 
> >> to emacs and has nothing to do with ERC in particular. For instance, I
> 
> >> also want my shell buffers not to scroll past the end of
> 
> >> buffers. Actually I think (but am not sure ; it would require testing)
> 
> >> I'd want all buffers to behave that way, and never, ever display
> 
> >> anything past the end of the buffer.
> 
> >
> 
> > How 'bout setting scroll-conservatively to 1000?
> 
> >
> 
> >
> 
> >         Stefan
> 
> 
> 
> Even with scroll-conservatively, there are situations where the
> 
> centering displays stuff after the buffer end, by playing around with
> 
> C-v / M-v. Another way is to find a file, M->, then C-x 2 and C-x
> 
> 1. There's a lot of other ways. This is in contrast with most
> 
> editors/browsers, which don't allow you to scroll past the end of the
> 
> buffer, ever. I'm not 100% sure whether I want that behavior for emacs
> 
> generally. However, I do want it for ERC / shells.

Was this ever resolved? I personally still experience it with a freshly compiled version.

GNU Emacs 24.2.1 (x86_64-unknown-linux-gnu, GTK+ Version 2.24.10) of 2013-02-07 on linux-e2bl
ERC Version 5.3 (GNU Emacs 24.2.1)

Message #47 received at 11697 <at> debbugs.gnu.org (full text, mbox):

From: Lars Ingebrigtsen <larsi <at> gnus.org>
To: Ivan Kanis <ivan <at> kanis.fr>
Cc: Glenn Morris <rgm <at> gnu.org>, 11697 <at> debbugs.gnu.org, 16697 <at> debbugs.gnu.org,
 Josh <josh <at> foxtail.org>
Subject: Re: bug#16697: 24.3.50;
 ERC scrolltobottom module does not work anymore
Date: Sun, 27 Dec 2015 22:24:17 +0100

It's unclear what the conclusion of these bug reports were.  Was this
fixed or does the problem remain?

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

Message #50 received at 11697 <at> debbugs.gnu.org (full text, mbox):

From: Ivan Kanis <ivan <at> kanis.fr>
To: Lars Ingebrigtsen <larsi <at> gnus.org>
Cc: Glenn Morris <rgm <at> gnu.org>, 11697 <at> debbugs.gnu.org, 16697 <at> debbugs.gnu.org,
 Josh <josh <at> foxtail.org>
Subject: Re: bug#16697: 24.3.50;
 ERC scrolltobottom module does not work anymore
Date: Mon, 28 Dec 2015 20:09:38 +0100

Hi Lars,

The problem remains.

December, 27 at 22:24 Lars wrote:

> It's unclear what the conclusion of these bug reports were.  Was this
> fixed or does the problem remain?

-- 
At Group L, Stoffel oversees six first-rate programmers, a
managerial challenge roughly comparable to herding cats.
    -- Anonymous , 1985-06-09 , The Washington Post

Message #53 received at 11697 <at> debbugs.gnu.org (full text, mbox):

From: Ivan Kanis <ivan <at> kanis.fr>
To: Lars Ingebrigtsen <larsi <at> gnus.org>
Cc: Glenn Morris <rgm <at> gnu.org>, 11697 <at> debbugs.gnu.org, 16697 <at> debbugs.gnu.org,
 Josh <josh <at> foxtail.org>
Subject: Re: bug#16697: 24.3.50;
 ERC scrolltobottom module does not work anymore
Date: Mon, 28 Dec 2015 20:11:16 +0100

December, 27 at 22:24 Lars wrote:

> It's unclear what the conclusion of these bug reports were.  Was this
> fixed or does the problem remain?

I forgot to mention I am running on a recent master:

7e9da9f [8 weeks ago] ; Shorten TODO list in file-notify-tests.el
[Michael Albinus]

-- 
In this world nothing can be said to be certain,
except death and taxes.
    -- Benjamin Franklin

Message #56 received at 11697 <at> debbugs.gnu.org (full text, mbox):

From: Lars Ingebrigtsen <larsi <at> gnus.org>
To: Ivan Kanis <ivan <at> kanis.fr>
Cc: Glenn Morris <rgm <at> gnu.org>, 11697 <at> debbugs.gnu.org, 16697 <at> debbugs.gnu.org,
 Josh <josh <at> foxtail.org>
Subject: Re: bug#16697: 24.3.50;
 ERC scrolltobottom module does not work anymore
Date: Thu, 04 Feb 2016 17:12:42 +1100

Ivan Kanis <ivan <at> kanis.fr> writes:

> Hi Lars,
>
> The problem remains.

Ok, I've done some further reading of the many threads and references
here, and I'm still not quite sure what the bug is.  :-)

Do you have a recipe starting from emacs -Q that demonstrates what
happens, and could you describe what you wanted to have happen instead?

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

Message #59 received at 11697 <at> debbugs.gnu.org (full text, mbox):

From: Ivan Kanis <ivan <at> kanis.fr>
To: Lars Ingebrigtsen <larsi <at> gnus.org>
Cc: Glenn Morris <rgm <at> gnu.org>, 11697 <at> debbugs.gnu.org, 16697 <at> debbugs.gnu.org,
 Josh <josh <at> foxtail.org>
Subject: Re: bug#16697: 24.3.50;
 ERC scrolltobottom module does not work anymore
Date: Thu, 04 Feb 2016 21:51:19 +0100

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

February, 04 at 17:12 Lars wrote:

> Ivan Kanis <ivan <at> kanis.fr> writes:
>
>> Hi Lars,
>>
>> The problem remains.
>
> Ok, I've done some further reading of the many threads and references
> here, and I'm still not quite sure what the bug is.  :-)
>
> Do you have a recipe starting from emacs -Q that demonstrates what
> happens, and could you describe what you wanted to have happen instead?

Hi Lars,

It's very easy to reproduce.

I am running a month old master (git 384cf23).

emacs -Q

1) evaluate (setq erc-modules '(scrolltobottom))
2) M-x erc
3) select default values
4) /j #emacs
5) wait for the buffer to fill up

I expect the prompt line to stay at the bottom.

It jumps back to the middle.

I have attached a picture. See the ERC> prompt with the blue background?
It jumped back to the middle.

I wish you a very productive month of hacking ;)

Take care,

Ivan

[2016-02-04-214423_755x725_scrot.png (image/png, attachment)]

Message #64 received at 11697 <at> debbugs.gnu.org (full text, mbox):

From: Lars Ingebrigtsen <larsi <at> gnus.org>
To: Ivan Kanis <ivan <at> kanis.fr>
Cc: 28839 <at> debbugs.gnu.org, 11697 <at> debbugs.gnu.org, Josh <josh <at> foxtail.org>,
 16697 <at> debbugs.gnu.org, Glenn Morris <rgm <at> gnu.org>
Subject: Re: bug#11697: bug#16697: 24.3.50; ERC scrolltobottom module does
 not work anymore
Date: Wed, 23 Oct 2019 11:57:44 +0200

Ivan Kanis <ivan <at> kanis.fr> writes:

> emacs -Q
>
> 1) evaluate (setq erc-modules '(scrolltobottom))
> 2) M-x erc
> 3) select default values
> 4) /j #emacs
> 5) wait for the buffer to fill up
>
> I expect the prompt line to stay at the bottom.
>
> It jumps back to the middle.

This was a bit convoluted to fix, as none of the hooks erc had could be
used, as they're called while saving too many excursions.  (Well, I
could have rewritten the erc-scroll-to-bottom function to not use
`recenter' at all, which may have been a better idea, come to think of
it.)

But I fixed it a different way, so that now point is kept at the end of
the buffer (if the window is selected).

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

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