GNU bug report logs - #28839
25.3; ERC: Error in post-command-hook (erc-scroll-to-bottom): (error "‘recenter’ing a window that does not display current-buffer.")

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

From: s1ohy <at> waifu.club
To: bug-gnu-emacs <at> gnu.org
Subject: 25.3; ERC: Error in post-command-hook (erc-scroll-to-bottom): (error "‘recenter’ing a window that does not display current-buffer.")
Date: Sat, 14 Oct 2017 12:52:46 -0600

Running Emacs 25.3.1, I run into the error:
Error in post-command-hook (erc-scroll-to-bottom): (error "‘recenter’ing
a window that does not display current-buffer.")

From 'emacs -Q' this can be reproduced by evaluating:
(require 'erc-goodies)
(setq erc-input-line-position -1)
(erc-scrolltobottom-enable)

Join a server; join a channel and wait for all the text to load; join
another channel, then switch back to previous channel.

---------------------------------------------------------------------


In GNU Emacs 25.3.1 (x86_64-pc-linux-gnu, GTK+ Version 3.18.9)
 of 2017-09-15 built on c
Windowing system distributor 'The X.Org Foundation', version 
11.0.11903000
System Description:	Ubuntu 16.04.3 LTS

Configured features:
XPM JPEG TIFF GIF PNG SOUND DBUS GSETTINGS NOTIFY FREETYPE XFT ZLIB
TOOLKIT_SCROLL_BARS GTK3 X11

Important settings:
  value of $LANG: en_US.UTF-8
  locale-coding-system: utf-8-unix

Major mode: Messages

Minor modes in effect:
  recentf-mode: t
  winner-mode: t
  which-key-mode: t
  ace-popup-menu-mode: t
  pdf-occur-global-minor-mode: t
  show-paren-mode: t
  display-time-mode: t
  ivy-mode: t
  delete-selection-mode: t
  erc-spelling-mode: t
  erc-log-mode: t
  erc-list-mode: t
  erc-menu-mode: t
  erc-autojoin-mode: t
  erc-ring-mode: t
  erc-networks-mode: t
  erc-pcomplete-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-irccontrols-mode: t
  erc-noncommands-mode: t
  erc-move-to-prompt-mode: t
  erc-readonly-mode: t
  erc-scrolltobottom-mode: t
  tooltip-mode: t
  global-eldoc-mode: t
  electric-indent-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
  buffer-read-only: t
  column-number-mode: t
  line-number-mode: t
  transient-mark-mode: t

Recent messages:
Opening TLS connection with ‘gnutls-cli --x509cafile 
/etc/ssl/certs/ca-certificates.crt -p 6697 lainchan.org --protocols 
ssl3’...failed
Opening TLS connection with ‘openssl s_client -connect lainchan.org:6697 
-no_ssl2 -ign_eof’...done
Opening TLS connection to ‘lainchan.org’...done
Connecting to lainchan.org:6697... ...done
Logging in as `S1ohy'...
Logging in without password
Logging in as ‘S1ohy’... done
Error in post-command-hook (erc-scroll-to-bottom): (error "‘recenter’ing 
a window that does not display current-buffer.")
Quit [2 times]
Error in post-command-hook (erc-scroll-to-bottom): (error "‘recenter’ing 
a window that does not display current-buffer.")

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Memory information:
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 (symbols 48 42482 0)
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Message #10 received at 28839 <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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