bug#11052: 24.0.94; Display problem under OS X Lion

[Richard Stanton]

This bug report will be sent to the Bug-GNU-Emacs mailing list
and the GNU bug tracker at debbugs.gnu.org.  Please check that
the From: line contains a valid email address.  After a delay of up
to one day, you should receive an acknowledgement at that address.

Please write in English if possible, as the Emacs maintainers
usually do not have translators for other languages.

Please describe exactly what actions triggered the bug, and
the precise symptoms of the bug.  If you can, give a recipe
starting from `emacs -Q':

Starting Emacs with a blank init.el file,

1) Switch to the *scratch* buffer

2) Execute M-x linum-mode

At this point, the lines are numbered, but the numbers have about the
rightmost 20% cut off.

3) Switch back to the *Gnu Emacs* buffer using C-x b, then back to
*scratch* using C-x b

Now the display looks slightly different from how it looked in step
2. The line numnbers look the same, but there is now a line of colored
pixels
visible in the gap between the linum column and the leftmost edge of the
text area, below the bottom of the text. I believe these are actually
the remains of the leftmost part of the text previously displayed in the
*Gnu
Emacs* buffer.

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'.
For information about debugging Emacs, please read the file
/Applications/Emacs.app/Contents/Resources/etc/DEBUG.


In GNU Emacs 24.0.94.1 (x86_64-apple-darwin, NS apple-appkit-1038.36)
 of 2012-02-27 on bob.porkrind.org
Windowing system distributor `Apple', version 10.3.1138
Configured using:
 `configure '--host=x86_64-apple-darwin' '--build=i686-apple-darwin'
 '--with-ns' 'build_alias=i686-apple-darwin'
 'host_alias=x86_64-apple-darwin' 'CC=gcc -mmacosx-version-min=10.5''

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

Major mode: Fundamental

Minor modes in effect:
  tooltip-mode: t
  mouse-wheel-mode: t
  tool-bar-mode: t
  menu-bar-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  blink-cursor-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  line-number-mode: t
  transient-mark-mode: t

Recent input:
e <backspace> <backspace> <backspace> <backspace> <backspace>
<backspace> t h e SPC l i n e SPC b e t w e e n SPC
t h e SPC f r i n g e SPC a n d SPC t h e SPC l e f
t m o s t SPC e d g e SPC o f SPC t h e SPC t e x t
SPC a r e a SPC ( i . e . , SPC r i g h t SPC o f SPC
t h e SPC l i n u m SPC c o l u m n , SPC a n d SPC
r i g h t SPC o f SPC t h e SPC <s-backspace> <s-backspace>
<s-backspace> <backspace> <backspace> <backspace> <backspace>
<backspace> <backspace> <backspace> <backspace> <backspace>
<backspace> <backspace> <backspace> <backspace> <backspace>
<backspace> <backspace> <backspace> <backspace> <backspace>
( ) <backspace> <backspace> ) . <up> <up> <up> <up>
<up> <up> <C-home> <down> <down> C-e SPC L i o n C-a
<down> <up> s-f <right> <right> <right> <right> <right>
<right> <right> <right> <right> <right> <right> <right>
<right> <right> <right> <right> <right> <right> <right>
<right> <right> <right> <right> <right> <right> <left>
SPC C-d C-d C-d C-d C-d C-d C-d C-d C-d C-d C-d C-d
C-d C-d C-d C-d <down> <down> <down> <down> <down>
<down> <down> <down> <down> <down> <down> <down> <down>
<down> <down> <down> <down> <down> <down> <down> <down>
<down> <down> <down> <down> <down> <down> <next> <next>
<next> <next> <next> <C-home> C-@ <C-end> s-w C-x b
<return> C-x 5 o <help-echo> <help-echo> <down-mouse-1>
<mouse-1> C-x 5 b <return> <down-mouse-1> <switch-frame>
s-x r e p o r t - e m a SPC <down-mouse-1> <mouse-movement>
<mouse-1> <escape> x r e p o r t - e m a c s - b SPC
<return>

Recent messages:
Auto-saving...done
Auto-saving...done
Quit [2 times]
Auto-saving...
Mark set
scroll-up-command: End of buffer
Mark set [2 times]
Auto-saving...done
ns-handle-scroll-bar-event: Beginning of buffer
byte-code: Buffer is read-only: #<buffer *GNU Emacs*>
scroll-up-command: End of buffer

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Features:
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emacsbug message format-spec rfc822 mml easymenu mml-sec mm-decode
mm-bodies mm-encode mail-parse rfc2231 mailabbrev gmm-utils mailheader
sendmail regexp-opt rfc2047 rfc2045 ietf-drums mm-util mail-prsvr
mail-utils linum time-date tooltip ediff-hook vc-hooks lisp-float-type
mwheel ns-win tool-bar dnd fontset image fringe lisp-mode register page
menu-bar rfn-eshadow timer select scroll-bar 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 minibuffer loaddefs
button faces cus-face files text-properties overlay sha1 md5 base64
format env code-pages mule custom widget hashtable-print-readable
backquote make-network-process ns multi-tty emacs)