bug#2701: 23.0.91; flashing/slow highlighting

[David Abrahams <dave@boostpro.com>]

Please write in English if possible, because the Emacs maintainers
usually do not have translators to read other languages for them.

Your bug report will be posted to the emacs-pretest-bug@gnu.org mailing list.

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

Put the following in a buffer and `M-x compilation-mode'.  Then hover
the mouse over the beginning of any line.  The text highlighting sweeps
visibly slowly across from left to right; it actually appears to be
happening twice for every line.  Regardless, it's way too slow.  This is
a recent snapshot on MacOSX.

=== schnipp ===
/Users/dave/src/boost/tools/quickbook/detail/./template_stack.hpp: In constructor 'quickbook::template_stack::template_stack()':
/Users/dave/src/boost/tools/quickbook/detail/./template_stack.hpp:87: warning: 'quickbook::template_stack::scopes' will be initialized after
/Users/dave/src/boost/tools/quickbook/detail/./template_stack.hpp:82: warning:   'boost::spirit::classic::functor_parser<quickbook::template_stack::parser> quickbook::template_stack::scope'
/Users/dave/src/boost/tools/quickbook/detail/template_stack.cpp:17: warning:   when initialized here
gcc.compile.c++ ../../../bin.v2/tools/quickbook/gcc-4.0.1/debug/link-static/detail/markups.o
=== schnapp ===

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 23.0.91.1 (i386-apple-darwin9.6.0, NS apple-appkit-949.43)
 of 2009-03-05 on black.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: 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: Compilation

Minor modes in effect:
  shell-dirtrack-mode: t
  diff-auto-refine-mode: t
  show-paren-mode: t
  server-mode: t
  global-auto-revert-mode: t
  delete-selection-mode: t
  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:
C-n C-n C-n M-x s v n - s t a t <tab> <return> <M-backspace> 
<backspace> s r c / b o o s t / l i b <tab> p y <tab> 
<return> C-s SPC M SPC C-s C-n C-p u C-p r y e s <return> 
M-< M-x C-g C-g C-x C-f e n <tab> <backspace> <backspace> 
<M-backspace> <M-backspace> <M-backspace> e n <tab> 
<backspace> <backspace> <tab> <tab> s <backspace> b 
o <tab> / <tab> <tab> e n <tab> u <tab> <return> n 
C-c C-a C-n n p C-c C-a C-x C-p C-x C-p C-x C-s C-x 
C-f C-g C-g C-p C-p C-p C-p C-p C-p C-p C-p C-p C-p 
C-p C-p C-p C-p C-p C-p C-p C-p C-p C-p C-p C-p C-p 
C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n 
C-n C-n C-n C-n C-n C-x C-f <M-backspace> <M-backspace> 
<M-backspace> <M-backspace> b o o s t <tab> / l i <tab> 
<M-backspace> t o o <tab> b u <tab> b j <tab> <backspace> 
<backspace> <tab> <tab> j a <tab> <backspace> <backspace> 
<tab> <tab> <M-backspace> j a <tab> <tab> <tab> / <return> 
C-n C-n C-n C-n C-n C-n C-p C-p C-p C-p C-p C-n C-p 
C-n M-x c o m p i l e <tab> <return> b u i l C-a C-k 
b u i l d - <backspace> _ d i s t . h s <backspace> 
<backspace> s h <return> n n C-x C-n C-x C-n M-x M-p 
<return> C-a . / <return> n n M-> <help-echo> <down-mouse-1> 
<mouse-1> <help-echo> <down-mouse-1> <mouse-1> C-n 
C-n C-n C-n C-n C-n C-n C-a C-p C-p C-p C-SPC C-n C-n 
C-n C-n C-n C-n C-n C-n C-p M-w M-x e m a <tab> b u 
<tab> C-a - <tab> C-a <tab> r e p <tab> <return>

Recent messages:
Mark set
Hunk applied
Saving file /Users/dave/src/boost/libs/python/test/enum.cpp...
Wrote /Users/dave/src/boost/libs/python/test/enum.cpp
Quit [2 times]
Making completion list... [4 times]
Compilation exited abnormally with code 127
Mark set [2 times]
Compilation finished
Making completion list...

-- 
Dave Abrahams
BoostPro Computing
http://www.boostpro.com