bug#13474: 24.3.50; Changing vertical-border face affects non-toolkit scroll bar

[Stephen Berman <stephen.berman@gmx.net>]

0. configure --without-toolkit-scroll-bars && make
1. emacs -Q
2. C-x 3
3. M-x scroll-bar-mode
4. M-: (set-face-attribute 'vertical-border nil :foreground "green")
   As expected, now the border line between the windows is green.
5. M-x scroll-bar-mode
   Unexpectedly, now the scroll bars are green.
6. M-: (set-face-attribute 'vertical-border nil :foreground "black")
   The scroll bars are still green.
7. M-x scroll-bar-mode
   Now the border line between the windows is black.
8. M-x scroll-bar-mode
   Now the scroll bars are black.

This pattern changes (to the expected behavior) when scroll-bar face is
customized:

9. M-x customize-face RET scroll-bar RET, show all attributes, check the
   Foreground box, change its value to "green", and set for current
   session.
   Now the scroll bars are green.
10. M-x scroll-bar-mode
   As expected, the border line between the windows is still black.
11. M-: (set-face-attribute 'vertical-border nil :foreground "red")
   Now the border line between the windows is red.
12. M-x scroll-bar-mode
   As expected, the scroll bars are still green. 


In GNU Emacs 24.3.50.4 (x86_64-suse-linux-gnu, GTK+ Version 3.4.4)
 of 2013-01-17 on rosalinde
Bzr revision: 111542 michael.albinus@gmx.de-20130117090647-lb9mkbk6n8q142w5
Windowing system distributor `The X.Org Foundation', version 11.0.11203000
System Description:	openSUSE 12.2 (x86_64)

Configured using:
 `configure --without-toolkit-scroll-bars CFLAGS=-g3 -O0 --no-create
 --no-recursion'

Important settings:
  value of $LANG: en_US.UTF-8
  value of $XMODIFIERS: @im=local
  locale-coding-system: utf-8-unix
  default enable-multibyte-characters: t