--- Begin Message ---
|
Subject: |
26.0.50; Slowdown/crash on certain characters |
|
Date: |
Mon, 26 Dec 2016 20:09:16 +0000 |
>From emacs -Q:
Insert MUSIC FLAT SIGN or RIGHTWARDS DOUBLE ARROW in a buffer.
Move point around in the buffer or edit the buffer text.
Emacs gets very slow, consuming a lot of CPU.
Sometimes it completely grinds to a halt.
MUSIC FLAT SIGN and RIGHTWARDS DOUBLE ARROW are examples
that cause this problem for me. MUSIC SHARP SIGN and
RIGHTWARDS ARROW are examples that do not cause a problem.
Below are the contents of the describe-char buffer for these
characters (with the character itself asterisked out in each
case so as not to crash my Emacs while I edit this mail).
Note the categories. They seem illogical. Are they supposed
to be like that? Why?
Note the fonts. Could there be a bug in "Malgun Gothic"?
As far as I know it's a Korean font installed by default with Windows.
Could there be a bug in "Consolas"? Why does Emacs find the MUSIC
SHARP SIGN glyph but not the MUSIC FLAT SIGN glyph from Consolas?
I asked about this on IRC and there exist Windows Emacs users who
don't have the issue, so it may be influenced by environmental
factors.
Is there anything I can do to avoid it?
Install better fonts? (Any suggestions?)
Uninstall bad fonts?
Configure Emacs to search fonts in a different order?
** RIGHTWARDS DOUBLE ARROW (bad!):
position: 146 of 148 (98%), column: 0
character: * (displayed as *) (codepoint 8594, #o20622, #x2192)
preferred charset: unicode (Unicode (ISO10646))
code point in charset: 0x2192
script: symbol
syntax: . which means: punctuation
category: .:Base, c:Chinese, h:Korean, j:Japanese
to input: type "C-x 8 RET 2192" or "C-x 8 RET RIGHTWARDS ARROW"
buffer code: #xE2 #x86 #x92
file code: not encodable by coding system iso-latin-1-dos
display: by this font (glyph code)
uniscribe:-outline-Consolas-normal-normal-normal-mono-11-*-*-*-c-*-iso8859-1
(#x365)
Character code properties: customize what to show
name: RIGHTWARDS ARROW
old-name: RIGHT ARROW
general-category: Sm (Symbol, Math)
decomposition: (8594) ('*')
** MUSIC FLAT SIGN (bad!):
position: 146 of 148 (98%), column: 0
character: * (displayed as *) (codepoint 9837, #o23155, #x266d)
preferred charset: unicode (Unicode (ISO10646))
code point in charset: 0x266D
script: symbol
syntax: _ which means: symbol
category: .:Base, h:Korean, j:Japanese
to input: type "C-x 8 RET 266d" or "C-x 8 RET MUSIC FLAT SIGN"
buffer code: #xE2 #x99 #xAD
file code: not encodable by coding system iso-latin-1-dos
display: by this font (glyph code)
uniscribe:-outline-Malgun
Gothic-normal-normal-normal-sans-11-*-*-*-p-*-ksc5601.1987-0 (#xCF2)
Character code properties: customize what to show
name: MUSIC FLAT SIGN
old-name: FLAT
general-category: So (Symbol, Other)
decomposition: (9837) ('*')
** MUSIC SHARP SIGN (ok!):
position: 148 of 152 (97%), column: 0
character: * (displayed as *) (codepoint 9839, #o23157, #x266f)
preferred charset: unicode (Unicode (ISO10646))
code point in charset: 0x266F
script: symbol
syntax: _ which means: symbol
category: .:Base, j:Japanese
to input: type "C-x 8 RET 266f" or "C-x 8 RET MUSIC SHARP SIGN"
buffer code: #xE2 #x99 #xAF
file code: not encodable by coding system iso-latin-1-dos
display: by this font (glyph code)
uniscribe:-outline-MS
Gothic-normal-normal-normal-mono-11-*-*-*-c-*-gb2312.1980*-* (#x761)
Character code properties: customize what to show
name: MUSIC SHARP SIGN
old-name: SHARP
general-category: Sm (Symbol, Math)
decomposition: (9839) ('*')
RIGHTWARDS ARROW (ok!):
position: 148 of 150 (98%), column: 0
character: * (displayed as *) (codepoint 8594, #o20622, #x2192)
preferred charset: unicode (Unicode (ISO10646))
code point in charset: 0x2192
script: symbol
syntax: . which means: punctuation
category: .:Base, c:Chinese, h:Korean, j:Japanese
to input: type "C-x 8 RET 2192" or "C-x 8 RET RIGHTWARDS ARROW"
buffer code: #xE2 #x86 #x92
file code: not encodable by coding system iso-latin-1-dos
display: by this font (glyph code)
uniscribe:-outline-Consolas-normal-normal-normal-mono-11-*-*-*-c-*-iso8859-1
(#x365)
Character code properties: customize what to show
name: RIGHTWARDS ARROW
old-name: RIGHT ARROW
general-category: Sm (Symbol, Math)
decomposition: (8594) ('*')
In GNU Emacs 26.0.50.10 (x86_64-w64-mingw32)
of 2016-12-26 built on MACHINE
Repository revision: a8a24b5be7f8cb6741f28000ae34c5b39ad9644e
Windowing system distributor 'Microsoft Corp.', version 10.0.14393
Recent messages:
Making completion list... [3 times]
Quit [2 times]
Mark saved where search started [2 times]
delete-backward-char: Text is read-only
Making completion list... [6 times]
uncompressing eintr.info.gz...done
C-c f is undefined
Making completion list...
Quit [7 times]
nil
Quit
Configured using:
'configure --prefix=/mingw64 --with-modules --without-imagemagick
--enable-locallisppath=/site-lisp
PKG_CONFIG_PATH=/mingw64/lib/pkgconfig:/mingw64/share/pkgconfig'
Configured features:
XPM JPEG TIFF GIF PNG RSVG SOUND DBUS NOTIFY ACL GNUTLS LIBXML2 ZLIB
TOOLKIT_SCROLL_BARS MODULES
Important settings:
value of $LANG: en_GB.UTF-8
locale-coding-system: cp1252
Major mode: Lisp Interaction
Minor modes in effect:
tooltip-mode: t
global-eldoc-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
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
Load-path shadows:
None found.
Features:
(shadow sort mail-extr emacsbug message subr-x puny seq byte-opt gv
bytecomp byte-compile cl-extra help-mode cconv cl-loaddefs pcase cl-lib
dired dired-loaddefs format-spec rfc822 mml mml-sec password-cache epa
derived epg epg-config gnus-util rmail rmail-loaddefs mm-decode
mm-bodies mm-encode mail-parse rfc2231 mailabbrev gmm-utils mailheader
sendmail rfc2047 rfc2045 ietf-drums mm-util mail-prsvr mail-utils
jka-compr misearch multi-isearch info easymenu time-date mule-util
tooltip eldoc electric uniquify ediff-hook vc-hooks lisp-float-type
mwheel dos-w32 ls-lisp disp-table term/w32-win w32-win w32-vars
term/common-win tool-bar dnd fontset image regexp-opt fringe
tabulated-list replace newcomment text-mode elisp-mode lisp-mode
prog-mode register page menu-bar rfn-eshadow isearch timer select
scroll-bar mouse jit-lock font-lock syntax facemenu font-core
term/tty-colors frame cl-generic cham georgian utf-8-lang misc-lang
vietnamese tibetan thai tai-viet lao korean japanese eucjp-ms cp51932
hebrew greek romanian slovak czech european ethiopic indian cyrillic
chinese composite charscript case-table epa-hook jka-cmpr-hook help
simple abbrev obarray minibuffer cl-preloaded nadvice loaddefs button
faces cus-face macroexp files text-properties overlay sha1 md5 base64
format env code-pages mule custom widget hashtable-print-readable
backquote w32notify dbusbind w32 multi-tty make-network-process emacs)
Memory information:
((conses 16 105644 8301)
(symbols 56 20593 0)
(miscs 48 44 180)
(strings 32 22316 4034)
(string-bytes 1 651472)
(vectors 16 14275)
(vector-slots 8 449241 5484)
(floats 8 184 173)
(intervals 56 414 1299)
(buffers 976 12))
--- End Message ---