bug#3792: 23.1.50; other-window misbehaving with C-tab keybinding

I only see this problem in the NextStep (Cocoa actually) version (i.e. not
X-windows) that I build from CVS.
I did the following:

nextstep/Emacs.app/Contents/MacOS/Emacs -q

(global-set-key [(control tab)] 'other-window)
C-x 2 ; to create a new window
C-tab ; switches to the other window, then back when I release tab.  If I
release control first then it does not change back to the other window.  It
should not switch back to the other window.



In GNU Emacs 23.1.50.2 (i386-apple-darwin9.7.0, NS apple-appkit-949.46)
 of 2009-07-06 on ivan-andruss-macbook-pro.local
Windowing system distributor `Apple', version 10.3.949
configured using `configure  '--with-ns''

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

Major mode: Lisp Interaction

Minor modes in effect:
  tooltip-mode: t
  mouse-wheel-mode: t
  menu-bar-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:
<down-mouse-1> <mouse-1> <help-echo> <down-mouse-1>
<mouse-1> <down-mouse-1> <mouse-1> <down-mouse-1> <mouse-1>
s-w <down-mouse-1> <mouse-1> s-x C-g C-x b <return>
<down-mouse-1> <mouse-1> d <backspace> s-( s-( ( c
l <backspace> <backspace> g l o b a l - s e t - k e
y SPC " C - T a b " SPC ' o t h e r - w i n d o w )
C-j q <up> <right> <right> <right> <right> <right>
<right> <right> <right> <right> <right> <right> <right>
<right> <right> <right> <right> C-y C-d C-d C-d C-d
C-d C-d C-d C-e C-x C-e C-x 2 <C-tab> <C-tab> <C-tab>
<C-tab> <C-tab> <C-tab> <C-tab> <C-tab> <C-tab> <C-tab>
<C-tab> <C-tab> <C-tab> <C-tab> <down-mouse-1> <mouse-1>
<help-echo> <down-mouse-1> <mouse-1> s-x r e l <backspace>
<backspace> C-/ C-/ C-/ C-/ C-/ SPC C-/ C-/ <down>
<down> <return> <return> <return> <return> <escape>
x r e p o <tab> r <tab> <return>

Recent messages:
call-interactively: Attempt to delete the sole visible or iconified frame
kill-region: The mark is not set now, so there is no region
Quit
Entering debugger...
Back to top level.
Mark set
other-window
Undo! [6 times]
Redo!
Making completion list...