GTK and menu separators

[Jesper Harder]

According to the manual

|  In the simplest case, SEPARATOR-TYPE consists of only dashes.  That
|  specifies the default kind of separator.

a string of consisting of only hyphens should give a menu separator
line.  This works with the default Xaw3d build, but not in the GTK
version.

To reproduce evaluate:

  (define-key-after menu-bar-help-menu [test] '("----") 'emacs-faq)

In the default build this results in a proper separator in the "Help"
menu.  But in the GTK build it's shown as a string of four hyphens.


In GNU Emacs 21.3.50.26 (i686-pc-linux-gnu)
 of 2003-03-22 on defun.localdomain
configured using `configure '--with-gtk''

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.iso88591
  locale-coding-system: iso-latin-1
  default-enable-multibyte-characters: t