bug#3378: 23.0.94; Debugger entered--Lisp error: (void-function x-own-selection-internal)

[Leo]

Please describe exactly what actions triggered the bug
and the precise symptoms of the bug:

1. use mouse to select some text
2. while you are still dragging the mouse, hold down COMMAND key.

Command is set to meta by (setq mac-command-modifier 'meta) in my
setting.

I can get the following backtrace:

Debugger entered--Lisp error: (void-function x-own-selection-internal)
  x-own-selection-internal(SECONDARY #("for notes you don't want to save, and 
for Lisp evaluation.\n;; If you want to create a file, visit that file with C-x 
C-f,\n;; then enter the text in that" 0 59 (fontified t face 
font-lock-comment-face) 59 62 (fontified t face 
font-lock-comment-delimiter-face) 62 122 (fontified t face 
font-lock-comment-face) 122 125 (fontified t face 
font-lock-comment-delimiter-face) 125 152 (fontified t face 
font-lock-comment-face)))
  x-set-selection(SECONDARY #("for notes you don't want to save, and for Lisp 
evaluation.\n;; If you want to create a file, visit that file with C-x C-f,\n;; 
then enter the text in that" 0 59 (fontified t face font-lock-comment-face) 59 
62 (fontified t face font-lock-comment-delimiter-face) 62 122 (fontified t face 
font-lock-comment-face) 122 125 (fontified t face 
font-lock-comment-delimiter-face) 125 152 (fontified t face 
font-lock-comment-face)))
  mouse-set-secondary((M-drag-mouse-1 (#<window 217 on *scratch*> 19 (147 . 6) 
248096730 nil 19 (18 . 0) nil (3 . 6) (8 . 16)) (#<window 217 on *scratch*> 171 
(247 . 33) 248097706 nil 171 (30 . 2) nil (7 . 1) (8 . 16))))
  call-interactively(mouse-set-secondary nil nil)


If Emacs crashed, and you have the Emacs process in the gdb debugger,
please include the output from the following gdb commands:
    `bt full' and `xbacktrace'.
If you would like to further debug the crash, please read the file
/Applications/Emacs.app/Contents/Resources/etc/DEBUG for instructions.


In GNU Emacs 23.0.94.1 (i386-apple-darwin9.7.0, NS apple-appkit-949.46)
 of 2009-05-23 on 200.sub-75-216-116.myvzw.com
Windowing system distributor `Apple', version 10.3.949
configured using `configure  '--with-ns''

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: nil
  value of $XMODIFIERS: nil
  locale-coding-system: nil
  default-enable-multibyte-characters: t