23.0.50; mtty emacsclient confused by dumb terminal & DISPLAY

[Trent W. Buck]

[Please CC me replies, I am not subscribed to the list.]

To summarize: if

  - Emacs is running in a tty
  - $DISPLAY is set, and
  - emacsclient is run in a dumb terminal (M-x shell)

emacsclient will create a new X frame, EVEN WITHOUT the -c switch.

I do not want this.  Within M-x shell, I want emacsclient to open a
buffer in the current frame and window, as it does under Emacs 22.

## Why?  Because I'm connecting remotely to a Screen session that was
## started under X.  New X frames will appear on the original X
## display -- which could be a five hour drive away from the keyboard
## and display I'm actually sitting in front of *now*.  Furthermore, X
## might not even be running anymore -- my Screen sessions persist
## across my X sessions.

Invoking emacsclient as "env -u DISPLAY emacsclient foo" does not
help.  It seems that (setenv "DISPLAY" nil) causes emacsclient to
behave as desired.  However, I do not want to unset $DISPLAY for my
whole Emacs session because then I have to re-enable it to launch X
processes to e.g. view images with display(1).

In GNU Emacs 23.0.50.1 (i486-pc-linux-gnu, GTK+ Version 2.12.5)
 of 2008-01-21 on elegiac, modified by Debian
 (emacs-snapshot package, version 1:20080120-1)
configured using `configure  '--build' 'i486-linux-gnu' '--host' 
'i486-linux-gnu' '--prefix=/usr' '--sharedstatedir=/var/lib' 
'--libexecdir=/usr/lib' '--localstatedir=/var' '--infodir=/usr/share/info' 
'--mandir=/usr/share/man' '--with-pop=yes' 
'--enable-locallisppath=/etc/emacs-snapshot:/etc/emacs:/usr/local/share/emacs/23.0.50/site-lisp:/usr/local/share/emacs/site-lisp:/usr/share/emacs/23.0.50/site-lisp:/usr/share/emacs/site-lisp:/usr/share/emacs/23.0.50/leim'
 '--with-x=yes' '--with-x-toolkit=gtk' 'build_alias=i486-linux-gnu' 
'host_alias=i486-linux-gnu' 'CFLAGS=-DDEBIAN -DSITELOAD_PURESIZE_EXTRA=5000 -g 
-O2''

Important settings:
  value of $LC_ALL: nil
  value of $LC_COLLATE: C
  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_AU.utf8
  locale-coding-system: utf-8
  default-enable-multibyte-characters: t

Major mode: Post

Minor modes in effect:
  xterm-mouse-mode: t
  shell-dirtrack-mode: t
  icomplete-mode: t
  partial-completion-mode: t
  show-paren-mode: t
  delete-selection-mode: t
  mouse-wheel-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  unify-8859-on-encoding-mode: t
  utf-translate-cjk-mode: t
  auto-compression-mode: t
  column-number-mode: t
  line-number-mode: t
  transient-mark-mode: t

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