bug#10068: 23.3; Dragging the left expands the right [Cocoa]

[Alexander Rozenshteyn]

emacs -Q
attempt to drag from the left; observe the window expanding on the right.


In GNU Emacs 23.3.1 (x86_64-apple-darwin11.2.0, NS apple-appkit-1138.23)
of 2011-11-16 on yabloko
Windowing system distributor `Apple', version 10.3.1138
configured using `configure  '--prefix=/usr/local/Cellar/emacs/23.3a' 
'--without-dbus' '--enable-locallisppath=/usr/local/share/emacs/site-lisp' 
'--infodir=/usr/local/Cellar/emacs/23.3a/share/info/emacs' '--with-ns' 
'--disable-ns-self-contained' 'CC=/usr/bin/llvm-gcc' 'CFLAGS=-fno-pie -O2' 
'LDFLAGS=-fno-pie''

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: 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
  blink-cursor-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  line-number-mode: t
  transient-mark-mode: t

Recent input:
<help-echo> M-x r e p o <tab> r q <backspace> <tab> 
<return>

Recent messages:
For information about GNU Emacs and the GNU system, type C-h C-a.
Making completion list...
call-interactively: Text is read-only

Load-path shadows:
None found.

Features:
(shadow sort mail-extr message ecomplete rfc822 mml mml-sec
password-cache mm-decode mm-bodies mm-encode mailcap mail-parse rfc2231
rfc2047 rfc2045 qp ietf-drums mailabbrev nnheader gnus-util netrc
time-date mm-util mail-prsvr gmm-utils wid-edit mailheader canlock sha1
hex-util hashcash mail-utils emacsbug help-mode view tooltip ediff-hook
vc-hooks lisp-float-type mwheel ns-win easymenu tool-bar dnd fontset
image fringe lisp-mode register page menu-bar rfn-eshadow timer select
scroll-bar mldrag mouse jit-lock font-lock syntax facemenu font-core
frame cham georgian utf-8-lang misc-lang vietnamese tibetan thai
tai-viet lao korean japanese hebrew greek romanian slovak czech european
ethiopic indian cyrillic chinese case-table epa-hook jka-cmpr-hook help
simple abbrev loaddefs button minibuffer faces cus-face files
text-properties overlay md5 base64 format env code-pages mule custom
widget hashtable-print-readable backquote make-network-process ns
multi-tty emacs)