bug#11721: 24.1; Rendering bug in 24.x on OS X

[Erik Allik]

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 from 24.0.96, I'm experiencing serious rendering issues when
scrolling text. When the text moves downwards, it "grabs" pixels of the
window title bar, so a part of the text in the buffer becomes
unreadable, until it is selected again, which re-renders it.


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 24.1.1 (x86_64-apple-darwin, NS apple-appkit-1038.36)
 of 2012-06-10 on bob.porkrind.org
Windowing system distributor `Apple', version 10.3.1038
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: en_US.UTF-8
  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: nil
  default enable-multibyte-characters: t

Major mode: Compilation

Minor modes in effect:
  shell-dirtrack-mode: t
  desktop-save-mode: t
  global-linum-mode: t
  linum-mode: t
  show-paren-mode: t
  cua-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-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  column-number-mode: t
  line-number-mode: t
  transient-mark-mode: t
  abbrev-mode: t

Recent input:
<down> <down> <down> <down> <up> <up> <up> <up> <up>
<down> <down> <down> <s-down> C-M-a <up> <up> <left>
<right> <up> <up> <up> <up> <up> <up> <up> <up> <up>
<up> <up> <up> <up> <up> <up> <up> <up> <up> <up> <up>
<up> <up> <up> <down> <down> <down> <down> <down> <down>
<down> <down> <down> <down> <down> <down> <down> <S-up>
<S-up> <S-up> <S-up> <S-up> <S-up> <S-up> <S-up> <S-up>
<S-up> <S-up> <S-up> <S-up> <S-up> <S-up> <S-up> <S-up>
<S-up> <S-up> <S-up> <S-up> <S-up> <S-up> <S-up> <S-up>
<S-up> <S-up> <S-up> <S-up> <S-up> <S-up> <S-up> <S-up>
<S-up> <S-up> <S-up> <S-up> <S-up> <S-up> <S-up> <S-up>
<S-up> <S-up> <S-up> <S-up> <S-up> <S-up> <S-up> <S-up>
<S-up> <S-up> <S-up> <S-up> <S-up> <S-up> <down> <up>
<down> <S-up> <S-up> <S-up> <S-up> <S-up> <S-up> <S-up>
<S-up> <S-up> <S-up> <S-up> <S-up> <S-up> <S-up> <S-up>
<S-up> <S-up> <S-up> <S-up> <S-up> <S-up> <S-up> <S-up>
<S-up> <S-up> <S-up> <S-up> <S-up> <S-up> <S-up> <S-up>
<S-up> <S-up> <S-up> <S-up> <S-up> <S-up> <S-up> <down>
<down> <down> <down> <down> <down> <down> <down> <down>
C-v C-v <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> <down> <down> <up> <up>
<up> <up> <up> <up> <up> <up> C-v <s-up> C-c C-c <down>
<down> <down> <down> <down> <down> <down> <down> <down>
<down> <down> <down> <up> <up> <up> <up> <up> <up>
<up> <up> <up> <down> <down> <down> <down> <down> C-c
C-c s-o C-c C-c C-g s-o <down> <down> <down> <down>
<down> <down> <down> <down> <down> <down> <down> <down>
<down> <up> <up> <up> <up> <up> <up> <up> <up> M-h
s-c <s-up> <down> <down> <left> s-k y M-x <return>
<up> <up> <return> s-v C-c C-c y m a i l SPC c l i
e n t <return> M-x <return> <up> <up> <up> <return>
s-v s-s C-c C-c y M-x <up> <up> <return>

Recent messages:
Checking 65 files in /Applications/Emacs.app/Contents/Resources/lisp/obsolete...
Checking 1 files in /Applications/Emacs.app/Contents/Resources/leim...
Checking for load-path shadows...done
Mark set
Saving file /Users/erik.allik/*message*-20120615-223902...
Wrote /Users/erik.allik/*message*-20120615-223902
Send this bug report to the Emacs maintainers? (y or n)  y
Sending...
Sending via mail...
Sending...done

Load-path shadows:
/Users/erik.allik/.emacs.d/elpa/flymake-0.4.10/flymake hides
/Applications/Emacs.app/Contents/Resources/lisp/progmodes/flymake

Features:
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emacsbug message rfc822 mml mml-sec mm-decode mm-bodies mm-encode
mail-parse rfc2231 mailabbrev gmm-utils mailheader sendmail rfc2047
rfc2045 ietf-drums mail-utils cus-edit wid-edit find-file-in-project
dabbrev newcomment dired-aux dired tramp-sh multi-isearch tramp-cache
tramp tramp-compat auth-source eieio byte-opt bytecomp byte-compile
cconv macroexp assoc gnus-util mm-util mail-prsvr password-cache shell
pcomplete format-spec tramp-loaddefs maxframe smex vc-dispatcher vc-svn
vc-git nose cl virtualenv cython-mode derived easy-mmode ropemacs pymacs
imenu python-mode info-look info py-shell-complete easymenu cc-cmds
cc-engine cc-vars cc-defs caml-autoloads color-theme-autoloads
find-file-in-project-autoloads flymake-autoloads
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pymacs-autoloads python-mode-autoloads smex-autoloads
virtualenv-autoloads package tabulated-list server desktop linum flymake
compile comint regexp-opt ansi-color ring flymake-point uniquify advice
help-fns advice-preload edmacro kmacro ido tango-dark-theme paren
cus-start cus-load cua-base 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)