bug#1990: marked as done (23.0.60; Emacs trying too hard to find fonts that don't exist)

[owner@emacsbugs.donarmstrong.com (Emacs bug Tracking System)]

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Your message dated Sat, 24 Jan 2009 17:44:13 -0500
with message-id <874ozowchu.fsf@cyd.mit.edu>
and subject line Re: bug#1990: 23.0.60; Emacs trying too hard to find fonts that don't  exist
has caused the Emacs bug report #1990,
regarding 23.0.60; Emacs trying too hard to find fonts that don't exist
to be marked as done.

This means that you claim that the problem has been dealt with.
If this is not the case it is now your responsibility to reopen the
bug report if necessary, and/or fix the problem forthwith.

(NB: If you are a system administrator and have no idea what this
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-- 
1990: http://emacsbugs.donarmstrong.com/cgi-bin/bugreport.cgi?bug=1990
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From: Jason Rumney <jasonr@gnu.org>
To: emacs-pretest-bug <emacs-pretest-bug@gnu.org>
Subject: 23.0.60; Emacs trying too hard to find fonts that don't exist
Date: Thu, 22 Jan 2009 21:22:32 +0800
Message-ID: <49787318.20708@gnu.org>

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:

If fonts are not installed for some characters, then Emacs keeps trying 
to find fonts for them every time those characters are redisplayed. The 
following excerpt from font-log is with the xft font backend on 
GNU/Linux where the search is quick, thus not noticeable, but on Windows 
the search for fonts is expensive, so redisplay takes a couple of 
seconds. I have cut the end off, as the full font-log is long, but you 
can see from the first two font-for entries that Emacs is trying twice 
for the same character (and it tries again many times further down the log).

font for: (4121 . mule-unicode-0100-24ff)
list: -mutt-clearlyu-*-iso10646-1
list: -gnu-unifont-*-iso10646-1
list: -bitstream-Bitstream Vera Sans Mono-*-gb18030*-*
list: -*-Bitstream Vera Sans Mono-*-gb18030*-*
list: -bitstream-*-gb18030*-*
list: -*-gb18030*-*
list: -bitstream-Bitstream Vera Sans Mono-*-ksc5601.1987*-*
list: -*-Bitstream Vera Sans Mono-*-ksc5601.1987*-*
list: -bitstream-*-ksc5601.1987*-*
list: -*-ksc5601.1987*-*
list: -bitstream-Bitstream Vera Sans Mono-*-cns11643.1992-1
list: -*-Bitstream Vera Sans Mono-*-cns11643.1992-1
list: -bitstream-*-cns11643.1992-1
list: -*-cns11643.1992-1
list: -bitstream-Bitstream Vera Sans Mono-*-cns11643.1992-4
list: -*-Bitstream Vera Sans Mono-*-cns11643.1992-4
list: -bitstream-*-cns11643.1992-4
list: -*-cns11643.1992-4
list: -bitstream-Bitstream Vera Sans Mono-*-cns11643.1992-5
list: -*-Bitstream Vera Sans Mono-*-cns11643.1992-5
list: -bitstream-*-cns11643.1992-5
list: -*-cns11643.1992-5
list: -bitstream-Bitstream Vera Sans Mono-*-cns11643.1992-6
list: -*-Bitstream Vera Sans Mono-*-cns11643.1992-6
list: -bitstream-*-cns11643.1992-6
list: -*-cns11643.1992-6
list: -bitstream-Bitstream Vera Sans Mono-*-cns11643.1992-7
list: -*-Bitstream Vera Sans Mono-*-cns11643.1992-7
list: -bitstream-*-cns11643.1992-7
list: -*-cns11643.1992-7
font for: (4121 . mule-unicode-0100-24ff)
list: -mutt-clearlyu-*-iso10646-1
list: -gnu-unifont-*-iso10646-1
list: -bitstream-Bitstream Vera Sans Mono-*-gb18030*-*
list: -*-Bitstream Vera Sans Mono-*-gb18030*-*
list: -bitstream-*-gb18030*-*
list: -*-gb18030*-*
list: -bitstream-Bitstream Vera Sans Mono-*-ksc5601.1987*-*
list: -*-Bitstream Vera Sans Mono-*-ksc5601.1987*-*
list: -bitstream-*-ksc5601.1987*-*
list: -*-ksc5601.1987*-*
list: -bitstream-Bitstream Vera Sans Mono-*-cns11643.1992-1
list: -*-Bitstream Vera Sans Mono-*-cns11643.1992-1
list: -bitstream-*-cns11643.1992-1
list: -*-cns11643.1992-1
list: -bitstream-Bitstream Vera Sans Mono-*-cns11643.1992-4
list: -*-Bitstream Vera Sans Mono-*-cns11643.1992-4
list: -bitstream-*-cns11643.1992-4
list: -*-cns11643.1992-4
list: -bitstream-Bitstream Vera Sans Mono-*-cns11643.1992-5
list: -*-Bitstream Vera Sans Mono-*-cns11643.1992-5
list: -bitstream-*-cns11643.1992-5
list: -*-cns11643.1992-5
list: -bitstream-Bitstream Vera Sans Mono-*-cns11643.1992-6
list: -*-Bitstream Vera Sans Mono-*-cns11643.1992-6
list: -bitstream-*-cns11643.1992-6
list: -*-cns11643.1992-6
list: -bitstream-Bitstream Vera Sans Mono-*-cns11643.1992-7
list: -*-Bitstream Vera Sans Mono-*-cns11643.1992-7
list: -bitstream-*-cns11643.1992-7
list: -*-cns11643.1992-7


To reproduce: C-h h
On my system, there are boxes displayed for Sinhala, Tibetan, Khmer and 
Burmese.
Scroll down so that the first set of boxes disappears just off the top 
of the window.
M-: (setq font-log nil)
Scroll back up
M-x font-show-log

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
/home/jasonr/emacs/etc/DEBUG for instructions.


In GNU Emacs 23.0.60.1 (x86_64-unknown-linux-gnu, GTK+ Version 2.12.11)
 of 2008-12-28 on wanchan.jasonrumney.net
Windowing system distributor `Colin Harrison', version 11.0.60900031
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: en_GB.UTF-8
  value of $XMODIFIERS: nil
  locale-coding-system: utf-8-unix
  default-enable-multibyte-characters: t

Major mode: Help

Minor modes in effect:
  tooltip-mode: t
  tool-bar-mode: t
  mouse-wheel-mode: t
  menu-bar-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  blink-cursor-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
  view-mode: t

Recent input:
<help-echo> <help-echo> <help-echo> <help-echo> <escape>
x C-g C-h h <help-echo> <next> <prior> <down> <down>
<mouse-1> <mouse-1> <mouse-1> <mouse-1> <mouse-1> <mouse-1>
<mouse-1> <mouse-1> <mouse-1> <mouse-1> <mouse-1> <mouse-1>
<mouse-1> <mouse-1> <mouse-1> <mouse-1> <mouse-1> <mouse-1>
<mouse-1> <mouse-1> <mouse-1> <mouse-1> <mouse-1> <mouse-1>
<mouse-1> <mouse-1> <mouse-1> <mouse-1> <mouse-1> <mouse-1>
<mouse-1> <mouse-1> <mouse-1> <mouse-1> <mouse-1> <mouse-1>
<mouse-1> <mouse-1> <mouse-1> <mouse-1> <mouse-1> <mouse-1>
<mouse-1> <mouse-1> <mouse-1> <mouse-1> <mouse-1> <mouse-1>
<mouse-1> <mouse-1> <mouse-1> <mouse-1> <mouse-1> <mouse-1>
<mouse-1> <mouse-1> <mouse-1> <mouse-1> <mouse-1> <mouse-1>
<mouse-1> <mouse-1> <mouse-1> <mouse-1> <mouse-1> <mouse-1>
<mouse-1> <mouse-1> <mouse-1> <mouse-1> <mouse-1> <mouse-1>
<mouse-1> <mouse-1> <mouse-1> <mouse-1> <mouse-1> <mouse-1>
<mouse-1> <mouse-1> <mouse-1> <mouse-1> <mouse-1> <mouse-1>
<mouse-1> <mouse-1> <mouse-1> <mouse-1> <mouse-1> <mouse-1>
<mouse-1> <mouse-1> <mouse-1> <mouse-1> <mouse-1> <mouse-1>
<mouse-1> <mouse-1> <mouse-1> <mouse-1> <mouse-1> <mouse-1>
<mouse-1> <mouse-1> <mouse-1> <escape> : ( s e t q
SPC f o n t - l o g SPC n i l ) <return> <prior> <escape>
x f o n t - s h <tab> <return> <down-mouse-1> <mouse-movement>
<mouse-movement> <mouse-movement> <mouse-movement>
<mouse-movement> <drag-mouse-1> <down-mouse-1> <mouse-1>
<prior> <prior> <up> <up> <up> <up> <up> <up> <up>
<up> <up> <up> <up> <up> <up> <up> <up> <up> <up> C-@
<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> <down>
<down> <down> <down> <down> <down> <down> <down> <down>
<down> <down> <down> <down> <down> <down> <escape>
w <help-echo> <help-echo> <help-echo> <help-echo> <escape>
x r e p o r t - e m a <tab> <return>

Recent messages:
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Saved text from "font for: (4121 . mule-unicode-0100-24ff"




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From: Chong Yidong <cyd@stupidchicken.com>
To: Juanma Barranquero <lekktu@gmail.com>
Cc: Jason Rumney <jasonr@gnu.org>, Kenichi Handa <handa@m17n.org>, 1990-done@emacsbugs.donarmstrong.com, 1952-done@emacsbugs.donarmstrong.com
Subject: Re: bug#1990: 23.0.60; Emacs trying too hard to find fonts that don't  exist
Date: Sat, 24 Jan 2009 17:44:13 -0500
Message-ID: <874ozowchu.fsf@cyd.mit.edu>

Juanma Barranquero <lekktu@gmail.com> writes:

>> That log message is emitted just before calling fontset_font (which is
>> where we would check whether fonts are known not to exist).
>
> OK.
>
> Then, please install your change. It's a big improvement.

I have installed a similar patch in CVS.