bug#2701: 23.0.91; flashing/slow highlighting

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 [email protected] 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