bug#7265: 24.0.50; cc-mode: scrolling is slow for large enumerations

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bug#7265: 24.0.50; cc-mode: scrolling is slow for large enumerations

From:	Christoph
Subject:	bug#7265: 24.0.50; cc-mode: scrolling is slow for large enumerations
Date:	Thu, 21 Oct 2010 17:16:52 -0600

Note, this might be related to bug #7264.

Copy the following code in a file.c and open it:

typedef enum
  {
    MEMBER = _MEMBER,
    MEMBER = _MEMBER,
    MEMBER = _MEMBER,
    MEMBER = _MEMBER,
    MEMBER = _MEMBER,
    MEMBER = _MEMBER,
    MEMBER = _MEMBER,
    MEMBER = _MEMBER,
    MEMBER = _MEMBER,
    MEMBER = _MEMBER,
    MEMBER = _MEMBER,
    MEMBER = _MEMBER,
    MEMBER = _MEMBER,
    MEMBER = _MEMBER,
    MEMBER = _MEMBER,
    MEMBER = _MEMBER,
    MEMBER = _MEMBER,
    MEMBER = _MEMBER,
    MEMBER = _MEMBER,
    MEMBER = _MEMBER,
    MEMBER = _MEMBER,
    MEMBER = _MEMBER,
    MEMBER = _MEMBER,
    MEMBER = _MEMBER,
    MEMBER = _MEMBER,
    MEMBER = _MEMBER,
    MEMBER = _MEMBER,
    MEMBER = _MEMBER,
    MEMBER = _MEMBER,
    MEMBER = _MEMBER,
    MEMBER = _MEMBER,
    MEMBER = _MEMBER,
    MEMBER = _MEMBER,
    MEMBER = _MEMBER,
    MEMBER = _MEMBER,
    MEMBER = _MEMBER,
    MEMBER = _MEMBER,
    MEMBER = _MEMBER,
    MEMBER = _MEMBER,
    MEMBER = _MEMBER,
    MEMBER = _MEMBER,
    MEMBER = _MEMBER,
    MEMBER = _MEMBER,
    MEMBER = _MEMBER,
    MEMBER = _MEMBER,
    MEMBER = _MEMBER,
    MEMBER = _MEMBER,
    MEMBER = _MEMBER,
    MEMBER = _MEMBER,
    MEMBER = _MEMBER,
    MEMBER = _MEMBER,
    MEMBER = _MEMBER,
    MEMBER = _MEMBER,
    MEMBER = _MEMBER,
    MEMBER = _MEMBER,
    MEMBER = _MEMBER,
    MEMBER = _MEMBER,
    MEMBER = _MEMBER,
    MEMBER = _MEMBER,
    MEMBER = _MEMBER,
    MEMBER = _MEMBER,
    MEMBER = _MEMBER,
    MEMBER = _MEMBER,
    MEMBER = _MEMBER,
    MEMBER = _MEMBER,
    MEMBER = _MEMBER,
    MEMBER = _MEMBER,
    MEMBER = _MEMBER,
    MEMBER = _MEMBER,
    MEMBER = _MEMBER,
    MEMBER = _MEMBER,
    MEMBER = _MEMBER,
    MEMBER = _MEMBER,
    MEMBER = _MEMBER,
    MEMBER = _MEMBER,
    MEMBER = _MEMBER,
    MEMBER = _MEMBER,
    MEMBER = _MEMBER,
    MEMBER = _MEMBER,
    MEMBER = _MEMBER,
    MEMBER = _MEMBER,
    MEMBER = _MEMBER,
    MEMBER = _MEMBER,
    MEMBER = _MEMBER,
    MEMBER = _MEMBER,
    MEMBER = _MEMBER,
    MEMBER = _MEMBER,
    MEMBER = _MEMBER,
    MEMBER = _MEMBER,
    MEMBER = _MEMBER,
    MEMBER = _MEMBER,
    MEMBER = _MEMBER,
    MEMBER = _MEMBER,
    MEMBER = _MEMBER,
    MEMBER = _MEMBER,
    MEMBER = _MEMBER,
    MEMBER = _MEMBER,
    MEMBER = _MEMBER,
    MEMBER = _MEMBER,
    MEMBER = _MEMBER,
    MEMBER = _MEMBER,
    MEMBER = _MEMBER,
    MEMBER = _MEMBER,
    MEMBER = _MEMBER,
    MEMBER = _MEMBER,
    MEMBER = _MEMBER,
    MEMBER = _MEMBER,
    MEMBER = _MEMBER,
    MEMBER = _MEMBER,
    MEMBER = _MEMBER,
    MEMBER = _MEMBER,
    MEMBER = _MEMBER,
    MEMBER = _MEMBER,
    MEMBER = _MEMBER,
    MEMBER = _MEMBER,
    MEMBER = _MEMBER,
    MEMBER = _MEMBER,
    MEMBER = _MEMBER,
    MEMBER = _MEMBER,
    MEMBER = _MEMBER,
    MEMBER = _MEMBER,
    MEMBER = _MEMBER,
    MEMBER = _MEMBER,
    MEMBER = _MEMBER,
    MEMBER = _MEMBER,
    MEMBER = _MEMBER,
    MEMBER = _MEMBER,
    MEMBER = _MEMBER,
    MEMBER = _MEMBER,
    MEMBER = _MEMBER,
    MEMBER = _MEMBER,
    MEMBER = _MEMBER,
    MEMBER = _MEMBER,
    MEMBER = _MEMBER,
    MEMBER = _MEMBER,
    MEMBER = _MEMBER,
    MEMBER = _MEMBER,
    MEMBER = _MEMBER,
    MEMBER = _MEMBER,
    MEMBER = _MEMBER,
    MEMBER = _MEMBER,
    MEMBER = _MEMBER,
    MEMBER = _MEMBER,
    MEMBER = _MEMBER,
    MEMBER = _MEMBER,
    MEMBER = _MEMBER,
    MEMBER = _MEMBER,
    MEMBER = _MEMBER,
    MEMBER = _MEMBER,
    MEMBER = _MEMBER,
    MEMBER = _MEMBER,
    MEMBER = _MEMBER,
    MEMBER = _MEMBER,
    MEMBER = _MEMBER,
    MEMBER = _MEMBER,
    MEMBER = _MEMBER,
    MEMBER = _MEMBER,
    MEMBER = _MEMBER,
    MEMBER = _MEMBER,
    MEMBER = _MEMBER,
    MEMBER = _MEMBER,
    MEMBER = _MEMBER,
    MEMBER = _MEMBER,
    MEMBER = _MEMBER,
    MEMBER = _MEMBER,
    MEMBER = _MEMBER,
    MEMBER = _MEMBER,
    MEMBER = _MEMBER,
    MEMBER = _MEMBER,
    MEMBER = _MEMBER,
    MEMBER = _MEMBER,
    MEMBER = _MEMBER,
    MEMBER = _MEMBER,
    MEMBER = _MEMBER,
    MEMBER = _MEMBER,
    MEMBER = _MEMBER,
    MEMBER = _MEMBER,
    MEMBER = _MEMBER,
    MEMBER = _MEMBER,
    MEMBER = _MEMBER,
    MEMBER = _MEMBER,
    MEMBER = _MEMBER,
    MEMBER = _MEMBER,
    MEMBER = _MEMBER,
    MEMBER = _MEMBER,
    MEMBER = _MEMBER,
    MEMBER = _MEMBER,
    MEMBER = _MEMBER,
    MEMBER = _MEMBER,
    MEMBER = _MEMBER,
    MEMBER = _MEMBER,
    MEMBER = _MEMBER,
    MEMBER = _MEMBER,
    MEMBER = _MEMBER,
    MEMBER = _MEMBER,
    MEMBER = _MEMBER,
    MEMBER = _MEMBER,
    MEMBER = _MEMBER,
    MEMBER = _MEMBER,
    MEMBER = _MEMBER
  } MyEnum;

Scrolling down with C-v is very slow and on my older machine at work it
takes a second or two for the screen to scroll at all. Alt-v seems work
correcly and is responsive as normal.

I also noticed that once I have scrolled through the file once, then go
back to the beginning and scroll with C-v again, it seems to work as
normal.

This problem does not occur in Emacs 23.2, where on the same machine at
work the scrolling is snappy as expected and there is no noticable delay.



In GNU Emacs 24.0.50.1 (i386-mingw-nt6.1.7600)
 of 2010-10-21 on MARVIN
Windowing system distributor `Microsoft Corp.', version 6.1.7600
configured using `configure --with-gcc (4.5) --cflags 
-IC:/Progra~2/GnuWin32/include -ID:/devel/emacs/libXpm-3.5.8/include 
-ID:/devel/emacs/libXpm-3.5.8/src'

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: ENU
  value of $XMODIFIERS: nil
  locale-coding-system: cp1252
  default enable-multibyte-characters: t

Major mode: C/l

Minor modes in effect:
  ido-everywhere: t
  yas/global-mode: t
  yas/minor-mode: t
  global-auto-revert-mode: t
  tooltip-mode: t
  mouse-wheel-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
  size-indication-mode: t
  column-number-mode: t
  line-number-mode: t
  abbrev-mode: t

Recent input:
<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> <down> <down> <down> 
<down> <down> <down> <down> <down> <down> <down> <down> 
<down> <down> <down> <down> <down> <down> <down> <prior> 
<prior> <prior> <prior> <prior> <prior> <prior> <prior> 
<prior> <next> <next> <next> <next> <next> <next> <next> 
<next> <next> <next> <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> 
C-k C-k C-k <down> <down> <down> <down> <return> <backspace> 
<backspace> <up> <up> <up> <C-left> <C-left> <C-left> 
<C-left> <C-right> <C-right> <C-right> <C-right> <C-right> 
SPC o n SPC m y SPC m a c h i n e <backspace> <backspace> 
<backspace> <backspace> <backspace> <backspace> <backspace> 
<backspace> <backspace> <backspace> <backspace> <backspace> 
<backspace> <backspace> <down> <right> <right> <right> 
<right> <right> <right> SPC C l o s i n g SPC t h e 
SPC <backspace> <backspace> <backspace> <backspace> 
<backspace> <backspace> <backspace> <backspace> <backspace> 
<backspace> <backspace> <backspace> A l s o , SPC <backspace> 
<backspace> <backspace> <backspace> <backspace> <backspace> 
<down> <down> <return> <up> <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> <right> <right> <right> <right> <right> <right> 
<right> <right> <right> SPC a n d SPC a l l SPC e n 
u m e r a t i o n SPC m e m b e r SPC a <backspace> 
<backspace> e <backspace> s SPC a r e SPC c o r r e 
c t l y SPC f o n t i f i e d . C-c C-c y e s <return> 
C-x RET r e p o t <backspace> r t <tab> <return>

Recent messages:
Mark set
Auto-saving...done
Mark set
Mark activated
Auto-saving...done
Auto-saving...done
Auto-saving...done
Sending...
Sending via mail...
Sending...done

Load-path shadows:
d:/devel/emacs/emacs-bzr/trunk/lisp/emacs-lisp/lmenu hides 
d:/devel/emacs/emacs-bzr/trunk/lisp/obsolete/lmenu
d:/devel/emacs/emacs-bzr/trunk/lisp/emacs-lisp/cl-compat hides 
d:/devel/emacs/emacs-bzr/trunk/lisp/obsolete/cl-compat

Features:
(rect newcomment help-mode view shadow sort gnus-util mail-extr message
rfc822 mml mml-sec mm-decode mm-bodies mm-encode mail-parse rfc2231
rfc2047 rfc2045 ietf-drums mm-util mail-prsvr mailabbrev mail-utils
gmm-utils mailheader emacsbug server js2-mode-autoloads
rainbow-mode-autoloads finder-inf package re-builder dired+ dired-x
ediff-merg ediff-diff ediff-wind ediff-mult ediff-help ediff-init
ediff-util dired-aux ibuffer nav nav-tags python-21 python nav-bufs
anything-config warnings browse-url semantic/util-modes semantic/util
semantic semantic/tag semantic/lex semantic/fw loaddefs eieio byte-opt
bytecomp byte-compile mode-local cedet imenu bookmark pp dired rx ffap
thingatpt anything google-c-style cc-mode cc-fonts cc-menus cc-cmds
cc-styles cc-align cc-engine cc-vars cc-defs grep-o-matic grep compile
comint browse-kill-ring+ browse-kill-ring second-sel ido yasnippet
dropdown-list derived easy-mmode assoc etags-table etags ring remember
zenburn color-theme edmacro kmacro wid-edit cl sendmail regexp-opt
reporter easymenu uniquify advice help-fns advice-preload autorevert
tooltip ediff-hook vc-hooks lisp-float-type mwheel dos-w32 disp-table
ls-lisp w32-win w32-vars 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
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 multi-tty emacs)

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bug#7265: 24.0.50; cc-mode: scrolling is slow for large enumerations, Christoph <=
- bug#7265: 24.0.50; cc-mode: scrolling is slow for large enumerations, Alan Mackenzie, 2010/10/24
  - bug#7265: 24.0.50; cc-mode: scrolling is slow for large enumerations, Christoph, 2010/10/25
- bug#7265: 24.0.50; cc-mode: scrolling is slow for large enumerations, Alan Mackenzie, 2010/10/30

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