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bug#5563: 23.1; erc reconnection should reuse existing buffers

From: Tom Tromey
Subject: bug#5563: 23.1; erc reconnection should reuse existing buffers
Date: Thu, 11 Feb 2010 10:00:31 -0700

Please write in English if possible, because the Emacs maintainers
usually do not have translators to read other languages for them.

Your bug report will be posted to the address@hidden mailing list,
and to the gnu.emacs.bug news group.

Please describe exactly what actions triggered the bug
and the precise symptoms of the bug:

I connect to multiple irc servers with erc.
There are a couple of channels that have the same name on different
servers; e.g. I have two different channels named #gdb.

erc puts these into buffers named #gdb and #gdb<2>.
Ok so far.

Now, on occasion I will lose connection to the servers.  erc will
reconnect.  In this case, usually the buffer #gdb will be properly
reused by the reconnection.  However, #gdb<2> will be discarded and erc
will make a new buffer named #gdb<3>.

I wish it always reused the existing buffer instead.

If Emacs crashed, and you have the Emacs process in the gdb debugger,
please include the output from the following gdb commands:
    `bt full' and `xbacktrace'.
If you would like to further debug the crash, please read the file
/usr/share/emacs/23.1/etc/DEBUG for instructions.

In GNU Emacs 23.1.1 (i386-redhat-linux-gnu, GTK+ Version 2.16.6)
 of 2010-01-14 on x86-01.phx2.fedoraproject.org
Windowing system distributor `The X.Org Foundation', version 11.0.10603901
configured using `configure  '--build=i386-redhat-linux-gnu' 
'--host=i386-redhat-linux-gnu' '--target=i586-redhat-linux-gnu' 
'--program-prefix=' '--prefix=/usr' '--exec-prefix=/usr' '--bindir=/usr/bin' 
'--sbindir=/usr/sbin' '--sysconfdir=/etc' '--datadir=/usr/share' 
'--includedir=/usr/include' '--libdir=/usr/lib' '--libexecdir=/usr/libexec' 
'--localstatedir=/var' '--sharedstatedir=/var/lib' '--mandir=/usr/share/man' 
'--infodir=/usr/share/info' '--with-dbus' '--with-gif' '--with-jpeg' 
'--with-png' '--with-rsvg' '--with-tiff' '--with-xft' '--with-xpm' 
'--with-x-toolkit=gtk' 'build_alias=i386-redhat-linux-gnu' 
'host_alias=i386-redhat-linux-gnu' 'target_alias=i586-redhat-linux-gnu' 
-fexceptions -fstack-protector --param=ssp-buffer-size=4 -m32 -march=i586 
-mtune=generic -fasynchronous-unwind-tables''

Important settings:
  value of $LC_ALL: nil
  value of $LC_COLLATE: nil
  value of $LC_CTYPE: nil
  value of $LC_MESSAGES: nil
  value of $LC_MONETARY: nil
  value of $LC_NUMERIC: nil
  value of $LC_TIME: nil
  value of $LANG: en_US.UTF-8
  value of $XMODIFIERS: nil
  locale-coding-system: utf-8-unix
  default-enable-multibyte-characters: t

Major mode: Group

Minor modes in effect:
  shell-dirtrack-mode: t
  diff-auto-refine-mode: t
  gnus-undo-mode: t
  erc-list-mode: t
  erc-menu-mode: t
  erc-autojoin-mode: t
  erc-ring-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-spelling-mode: t
  erc-truncate-mode: t
  erc-status-mode: t
  erc-services-mode: t
  erc-networks-mode: t
  erc-irccontrols-mode: t
  erc-noncommands-mode: t
  erc-move-to-prompt-mode: t
  erc-readonly-mode: t
  tooltip-mode: t
  mouse-wheel-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  global-auto-composition-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  line-number-mode: t
  transient-mark-mode: t

Recent input:
SPC m y SPC o t h e r SPC b u g , SPC I ' l l SPC d 
o SPC t h a t SPC n o w <return> C-z o M-v M-v C-r 
e r c C-a = <switch-frame> <switch-frame> C-s = > C-s 
C-s C-a Q y SPC SPC n <switch-frame> <switch-frame> 
c SPC s M-x r e p o r t - e m <tab> b <tab> C-g <switch-frame> 
f l e <tab> C-a C-k C-x b i r <tab> f r <tab> <return> 
/ h e l p SPC / q u i t M-b <backspace> <return> / 
h e l p SPC d i s c o n n e c t <return> M-p M-p <return> 
C-x 1 C-c b f l <tab> I SPC c a n ' t SPC t e s t SPC 
i t SPC r i g h t SPC n o w SPC b u t SPC i f SPC / 
q u i t SPC w o r k s SPC w h i l e SPC r <backspace> 
e r c SPC <M-backspace> <M-backspace> i n SPC M-b M-b 
M-b M-b C-k b a s i c a l l y SPC I SPC w a n t SPC 
/ q u i t SPC t o SPC w o r k SPC i n t SPC h e SPC 
s i t u a t i o n SPC M-b M-b C-b C-t C-e w h e r e 
SPC C-a C-k <f10> <f10> <f10> <f10> M-v M-> C-z o M-x 
r e p o r t - e m a c s - b u g <return> <return> C-x 
1 C-x k <return> y e s <return> M-x p <return> M-p 

Recent messages:
Saving /home/tromey/.newsrc.eld...
Saving file /home/tromey/.newsrc.eld...
Wrote /home/tromey/.newsrc.eld
Saving /home/tromey/.newsrc.eld...done
Type C-x 1 to delete the help window.
Type C-x 4 C-o RET to restore the other window.  
Type C-x 4 C-o RET to restore the other window.
Mark set
Making completion list...


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