bug#2138: 23.0.60; --daemon and ediff-window-setup-function

Start Emacs like this:

1. emacs -Q --eval "(require 'ediff)"
2. emacsclient -c
3. C-h v ediff-window-setup-function
=> ediff-setup-windows-multiframe

Now start Emacs like this:

1. emacs -Q --daemon --eval "(require 'ediff)"
2. emacsclient -c
3. C-h v ediff-window-setup-function
=> ediff-setup-windows-plain


I haven't tried debugging this, but my first guess is that
ediff-setup-windows-multiframe requires non-nil window-system but (still
guessing) when there is no frame window-system evaluates to nil.


In GNU Emacs 23.0.60.31 (i686-pc-linux-gnu, GTK+ Version 2.14.4)
 of 2009-01-31 on escher
Windowing system distributor `The X.Org Foundation', version 11.0.10502000
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: @im=local
  locale-coding-system: utf-8-unix
  default-enable-multibyte-characters: t