--- Begin Message ---
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Subject: |
24.5; interactive use of next-line and previous-line (holding down C-n or C-p) lag in a buffer with all spaces and newlines |
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Date: |
Thu, 05 May 2016 02:01:54 -0700 |
This is pretty minor, but it surprised me. When a buffer is filled with
spaces going all the way to the last column without overwrapping. If one
tries to navigate by lines using C-n or C-p and holding them down, there
is noticable lag. My window-body-width is 115 and window-body-height is
60.
Recipe:
1. Open emacs : Emacs -Q
2. Open a blank buffer: C-x b test-2
3. Fill the buffer up with spaces until it would force a linewrap, then
use C-j to enter a newline. C-u 115 <space>
C-j
4. The buffer should appear blank unless you use whitespace mode, now try
holding down C-n or C-p. Emacs will lag.
I also tested this in a tty emacs session on linux over ssh, and it
seemed the lag was also aparent over there.
The lag lasted at most around 5 seconds.
If the line has all spaces, one period, then a newline. (So if there is
one non-space character it seems) then this lag does not happen.
Frankly just curious,
James
In GNU Emacs 24.5.1 (x86_64-w64-mingw32)
of 2015-05-16 on KAEL
Windowing system distributor `Microsoft Corp.', version 6.3.9600
Configured using:
`configure --prefix=/z/emacs --host=x86_64-w64-mingw32
--target=x86_64-w64-mingw32 --build=x86_64-w64-mingw32 --with-wide-int
--with-jpeg --with-xpm --with-png --with-tiff --with-rsvg --with-xml2
--with-gnutls --with-sound=yes --with-file-notification=yes
--without-dbus --without-imagemagick 'CFLAGS=-O3 -fomit-frame-pointer
-g0 -pipe' 'LDFLAGS=-static-libgcc -static-libstdc++ -static -s
-Wl,-s''
Important settings:
value of $LANG: ENU
locale-coding-system: cp1252
Major mode: Fundamental
Minor modes in effect:
erc-list-mode: t
erc-menu-mode: t
erc-autojoin-mode: t
erc-ring-mode: t
erc-networks-mode: t
erc-pcomplete-mode: t
erc-track-mode: t
erc-track-minor-mode: t
erc-match-mode: t
erc-button-mode: t
erc-fill-mode: t
erc-stamp-mode: t
erc-netsplit-mode: t
erc-irccontrols-mode: t
erc-noncommands-mode: t
erc-move-to-prompt-mode: t
erc-readonly-mode: t
tooltip-mode: t
electric-indent-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 messages:
Checking 57 files in
c:/ProgramData/chocolatey/lib/emacs64/tools/emacs/share/emacs/24.5/lisp/eshell...
Checking 70 files in
c:/ProgramData/chocolatey/lib/emacs64/tools/emacs/share/emacs/24.5/lisp/erc...
Checking 34 files in
c:/ProgramData/chocolatey/lib/emacs64/tools/emacs/share/emacs/24.5/lisp/emulation...
Checking 151 files in
c:/ProgramData/chocolatey/lib/emacs64/tools/emacs/share/emacs/24.5/lisp/emacs-lisp...
Checking 24 files in
c:/ProgramData/chocolatey/lib/emacs64/tools/emacs/share/emacs/24.5/lisp/cedet...
Checking 57 files in
c:/ProgramData/chocolatey/lib/emacs64/tools/emacs/share/emacs/24.5/lisp/calendar...
Checking 87 files in
c:/ProgramData/chocolatey/lib/emacs64/tools/emacs/share/emacs/24.5/lisp/calc...
Checking 111 files in
c:/ProgramData/chocolatey/lib/emacs64/tools/emacs/share/emacs/24.5/lisp/obsolete...
Checking for load-path shadows...done
Mark set [2 times]
Quit
Load-path shadows:
None found.
Features:
(shadow sort mail-extr misearch multi-isearch noutline outline
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rfc2047 rfc2045 ietf-drums mail-utils eieio-opt speedbar sb-image
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erc-stamp erc-netsplit erc-goodies erc erc-backend erc-compat
format-spec auth-source eieio byte-opt bytecomp byte-compile cl-extra
cl-loaddefs cl-lib cconv eieio-core gnus-util mm-util help-fns
mail-prsvr password-cache thingatpt pp kmacro whitespace time-date
tooltip electric uniquify ediff-hook vc-hooks lisp-float-type mwheel
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custom widget hashtable-print-readable backquote make-network-process
w32notify w32 multi-tty emacs)
Memory information:
((conses 16 133688 22081)
(symbols 56 23279 0)
(miscs 48 130 422)
(strings 32 29961 2899)
(string-bytes 1 788055)
(vectors 16 17076)
(vector-slots 8 461686 8433)
(floats 8 87 296)
(intervals 56 1762 121)
(buffers 960 22))
--- End Message ---
--- Begin Message ---
|
Subject: |
Re: bug#23457: 24.5; interactive use of next-line and previous-line (holding down C-n or C-p) lag in a buffer with all spaces and newlines |
|
Date: |
Fri, 06 May 2016 12:24:10 +0300 |
> From: James McClain <address@hidden>
> Date: Fri, 6 May 2016 02:19:24 -0700
> Cc: Nicolas Petton <address@hidden>, address@hidden
>
> There is no real-life use case at all where I can see this problem
> happening, I was just curious as to why.
> Thank you for figuring that out,
> Glad to see I'm not crazy!
Thanks, closing.
--- End Message ---