bug#5025: 23.1.50; Blurry fonts with this evenings CVS checkout

[Tassilo Horn <tassilo@member.fsf.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 you can, give
a recipe starting from `emacs -Q':

I've updated my emacs to this evenings CVS HEAD.  Since then the fonts
look very blurry.  I use the Xft backend with this ~/.Xdefaults
settings.

--8<---------------cut here---------------start------------->8---
Emacs.FontBackend: xft, x
Emacs.Font: DejaVu Sans Mono-10
--8<---------------cut here---------------end--------------->8---

I also use this font in other applications, for example in the urxvt
terminal emulator.  But emacs is the only applications where the fonts
look blurry.

In parallel to the emacs update, I updated fontconfig from 2.7.2 to
2.8.0.  Maybe that's relevant.

Any ideas?  I'm happy to provide any informations you need.

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'.
For information about debugging Emacs, please read the file
/usr/share/emacs/23.1.50/etc/DEBUG.

In GNU Emacs 23.1.50.1 (x86_64-pc-linux-gnu, GTK+ Version 2.18.3)
 of 2009-11-23 on localhost
Windowing system distributor `The X.Org Foundation', version 11.0.10701000
configured using `configure  '--prefix=/usr' '--host=x86_64-pc-linux-gnu' '--mandir=/usr/share/man' '--infodir=/usr/share/info' '--datadir=/usr/share' '--sysconfdir=/etc' '--localstatedir=/var/lib' '--libdir=/usr/lib64' '--build=x86_64-pc-linux-gnu' '--program-suffix=-emacs-23-cvs' '--infodir=/usr/share/info/emacs-23-cvs' '--with-sound' '--with-x' '--without-gconf' '--without-toolkit-scroll-bars' '--with-gif' '--with-jpeg' '--with-png' '--with-rsvg' '--with-tiff' '--with-xpm' '--with-xft' '--with-libotf' '--with-m17n-flt' '--with-x-toolkit=gtk' '--without-hesiod' '--without-kerberos' '--without-kerberos5' '--with-gpm' '--with-dbus' 'build_alias=x86_64-pc-linux-gnu' 'host_alias=x86_64-pc-linux-gnu' 'CFLAGS=-march=core2 -O2 -pipe' 'LDFLAGS=-Wl,-z,now''

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_US.UTF-8
  value of $XMODIFIERS: nil
  locale-coding-system: utf-8-unix
  default enable-multibyte-characters: t

Major mode: Group

Minor modes in effect:
  gnus-topic-mode: t
  gnus-undo-mode: t
  recentf-mode: t
  ido-everywhere: t
  window-number-meta-mode: t
  window-number-mode: t
  exec-abbrev-cmd-mode: t
  global-subword-mode: t
  subword-mode: t
  global-hl-line-mode: t
  hl-line-mode: t
  savehist-mode: t
  show-paren-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
  blink-cursor-mode: t
  global-auto-composition-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  column-number-mode: t
  line-number-mode: t
  transient-mark-mode: t

Recent input:
C-x C-+ C-x C-s C-x C-- v e r s c h w o m m e n C-c 
t <down> <down> <down> <down> <left> <left> <return> 
M-x g <return> <return> <down> <down> <down> <down> 
<down> <down> <down> <down> <return> y <return> c <return> 
SPC c l s M-x r e b <return>

Recent messages:
20091123T213746.492> Saving ~/.gnus.registry.eld...
20091123T213746.518> Adding whitespace to ~/.gnus.registry.eld
Saving file ~/.gnus.registry.eld...
Wrote /home/horn/.gnus.registry.eld
20091123T213746.762> Saving ~/.gnus.registry.eld...done
(No changes need to be saved)
20091123T213746.764> Saving /home/horn/.newsrc.eld...
Saving file /home/horn/.newsrc.eld...
Wrote /home/horn/.newsrc.eld
20091123T213746.827> Saving /home/horn/.newsrc.eld...done

Load-path shadows:
~/repos/el/org-mode/lisp/org-bbdb hides /usr/share/emacs/23.1.50/lisp/org/org-bbdb
~/repos/el/org-mode/lisp/org-habit hides /usr/share/emacs/23.1.50/lisp/org/org-habit
~/repos/el/org-mode/lisp/org-colview hides /usr/share/emacs/23.1.50/lisp/org/org-colview
~/repos/el/org-mode/lisp/org-footnote hides /usr/share/emacs/23.1.50/lisp/org/org-footnote
~/repos/el/org-mode/lisp/org-freemind hides /usr/share/emacs/23.1.50/lisp/org/org-freemind
~/repos/el/org-mode/lisp/org-compat hides /usr/share/emacs/23.1.50/lisp/org/org-compat
~/repos/el/org-mode/lisp/org-icalendar hides /usr/share/emacs/23.1.50/lisp/org/org-icalendar
~/repos/el/org-mode/lisp/org-clock hides /usr/share/emacs/23.1.50/lisp/org/org-clock
~/repos/el/org-mode/lisp/org-bibtex hides /usr/share/emacs/23.1.50/lisp/org/org-bibtex
~/repos/el/org-mode/lisp/org-indent hides /usr/share/emacs/23.1.50/lisp/org/org-indent
~/repos/el/org-mode/lisp/org-faces hides /usr/share/emacs/23.1.50/lisp/org/org-faces
~/repos/el/org-mode/lisp/org-timer hides /usr/share/emacs/23.1.50/lisp/org/org-timer
~/repos/el/org-mode/lisp/org-vm hides /usr/share/emacs/23.1.50/lisp/org/org-vm
~/repos/el/org-mode/lisp/org-list hides /usr/share/emacs/23.1.50/lisp/org/org-list
~/repos/el/org-mode/lisp/org-gnus hides /usr/share/emacs/23.1.50/lisp/org/org-gnus
~/repos/el/org-mode/lisp/org-crypt hides /usr/share/emacs/23.1.50/lisp/org/org-crypt
~/repos/el/org-mode/lisp/org-exp hides /usr/share/emacs/23.1.50/lisp/org/org-exp
~/repos/el/org-mode/lisp/org-protocol hides /usr/share/emacs/23.1.50/lisp/org/org-protocol
~/repos/el/org-mode/lisp/org-inlinetask hides /usr/share/emacs/23.1.50/lisp/org/org-inlinetask
~/repos/el/org-mode/lisp/org-wl hides /usr/share/emacs/23.1.50/lisp/org/org-wl
~/repos/el/org-mode/lisp/org-plot hides /usr/share/emacs/23.1.50/lisp/org/org-plot
~/repos/el/org-mode/lisp/org-w3m hides /usr/share/emacs/23.1.50/lisp/org/org-w3m
~/repos/el/org-mode/lisp/org-agenda hides /usr/share/emacs/23.1.50/lisp/org/org-agenda
~/repos/el/org-mode/lisp/org-archive hides /usr/share/emacs/23.1.50/lisp/org/org-archive
~/repos/el/org-mode/lisp/org-attach hides /usr/share/emacs/23.1.50/lisp/org/org-attach
~/repos/el/org-mode/lisp/org-latex hides /usr/share/emacs/23.1.50/lisp/org/org-latex
~/repos/el/org-mode/lisp/org-mhe hides /usr/share/emacs/23.1.50/lisp/org/org-mhe
~/repos/el/org-mode/lisp/org-irc hides /usr/share/emacs/23.1.50/lisp/org/org-irc
~/repos/el/org-mode/lisp/org-table hides /usr/share/emacs/23.1.50/lisp/org/org-table
~/repos/el/org-mode/lisp/org-info hides /usr/share/emacs/23.1.50/lisp/org/org-info
~/repos/el/org-mode/lisp/org-docbook hides /usr/share/emacs/23.1.50/lisp/org/org-docbook
~/repos/el/org-mode/lisp/org-ascii hides /usr/share/emacs/23.1.50/lisp/org/org-ascii
~/repos/el/org-mode/lisp/org-jsinfo hides /usr/share/emacs/23.1.50/lisp/org/org-jsinfo
~/repos/el/org-mode/lisp/org-id hides /usr/share/emacs/23.1.50/lisp/org/org-id
~/repos/el/org-mode/lisp/org-feed hides /usr/share/emacs/23.1.50/lisp/org/org-feed
~/repos/el/org-mode/lisp/org-xoxo hides /usr/share/emacs/23.1.50/lisp/org/org-xoxo
~/repos/el/org-mode/lisp/org-publish hides /usr/share/emacs/23.1.50/lisp/org/org-publish
~/repos/el/org-mode/lisp/org-exp-blocks hides /usr/share/emacs/23.1.50/lisp/org/org-exp-blocks
~/repos/el/org-mode/lisp/org-mew hides /usr/share/emacs/23.1.50/lisp/org/org-mew
~/repos/el/org-mode/lisp/org-mobile hides /usr/share/emacs/23.1.50/lisp/org/org-mobile
~/repos/el/org-mode/lisp/org-datetree hides /usr/share/emacs/23.1.50/lisp/org/org-datetree
~/repos/el/org-mode/lisp/org-remember hides /usr/share/emacs/23.1.50/lisp/org/org-remember
~/repos/el/org-mode/lisp/org-macs hides /usr/share/emacs/23.1.50/lisp/org/org-macs
~/repos/el/org-mode/lisp/org-mouse hides /usr/share/emacs/23.1.50/lisp/org/org-mouse
~/repos/el/org-mode/lisp/org-html hides /usr/share/emacs/23.1.50/lisp/org/org-html
~/repos/el/org-mode/lisp/org-install hides /usr/share/emacs/23.1.50/lisp/org/org-install
~/repos/el/org-mode/lisp/org-src hides /usr/share/emacs/23.1.50/lisp/org/org-src
~/repos/el/org-mode/lisp/org hides /usr/share/emacs/23.1.50/lisp/org/org
~/repos/el/org-mode/lisp/org-rmail hides /usr/share/emacs/23.1.50/lisp/org/org-rmail
~/repos/el/org-mode/lisp/org-mac-message hides /usr/share/emacs/23.1.50/lisp/org/org-mac-message

Features:
(shadow emacsbug flow-fill gnus-cite smiley ansi-color gnus-async
gnus-bcklg sort gnus-ml gnus-topic parse-time pop3 nnml utf-7 utf7
auth-source nnimap imap trace nndraft nnmh nnnil gnus-agent gnus-srvr
gnus-score score-mode nnvirtual nntp gnus-cache notmuch bbdb-hooks
bbdb-gnus bbdb-snarf mail-extr spam spam-stat bbdb-com gnus-uu yenc
gnus-msg gnus-art mm-uu mml2015 epg-config mm-view smime dig
gnus-registry gnus-sum nnoo gnus-group gnus-undo nnmail mail-source
format-spec gnus-start gnus-spec gnus-int gnus-range gnus-win face-remap
garak elim warnings lui tracking flyspell ispell incomplete
rcirc-late-fix rcirc tg-mode greqlscript-mode generic greql-mode
th-latex swank-clojure-autoload clojure-mode swank-clojure paredit
slime-fancy slime-fontifying-fu slime-package-fu slime-mdot-fu
slime-references slime-xref-browser slime-scratch slime-presentations
slime-highlight-edits slime-fuzzy slime-fancy-inspector slime-c-p-c
slime-editing-commands slime-autodoc slime-enclosing-context slime-parse
slime-repl slime apropos hideshow hyperspec wtf cus-edit cus-start
cus-load rdictcc appt diary-lib diary-loaddefs vc-git org-attach
org-protocol org-irc org-info org-gnus org-bbdb org-id org-agenda
remember org-remember org-datetree org org-footnote org-src org-list
org-faces org-compat org-macs org-install cal-menu calendar cal-loaddefs
dired-x dired-aux pcomplete em-term term ehelp electric esh-var esh-io
esh-cmd esh-ext esh-proc esh-arg eldoc esh-groups eshell esh-util
esh-module esh-mode lisppaste xml-rpc xml th-boxquote boxquote rect
highlight-symbol hi-lock footnote smtpmail message idna sendmail
ecomplete rfc822 mml mml-sec password-cache mm-decode mm-bodies
mm-encode mailabbrev gmm-utils mailheader canlock sha1 hex-util hashcash
info server yasnippet dropdown-list derived noutline outline
highlight-parentheses filesets recentf tree-widget sr-speedbar speedbar
sb-image ezimage dframe ido anything-config compile comint ring
semantic/util-modes semantic/util semantic semantic/tag semantic/lex
semantic/fw eieio byte-opt bytecomp byte-compile mode-local cedet imenu
w3m-bookmark w3m browse-url doc-view jka-compr image-mode w3m-hist
w3m-fb w3m-ems w3m-ccl ccl w3m-favicon w3m-image w3m-proc w3m-util
bookmark pp ffap dired rx thingatpt anything woman easymenu man assoc
window-number uniquify advice help-fns advice-preload exec-abbrev-cmd
easy-mmode cl cl-19 subword hl-line saveplace savehist paren th-private
edmacro kmacro th-common mm-url gnus gnus-ems nnheader gnus-util netrc
mail-utils wid-edit url-http tls url url-proxy url-privacy url-expand
url-methods url-history mailcap url-auth mail-parse rfc2231 rfc2047
rfc2045 qp ietf-drums time-date url-cookie url-util url-parse url-gw
url-vars mm-util mail-prsvr windmove disp-table site-gentoo w3m-load
bbdb-autoloads bbdb regexp-opt timezone tex-site auto-loads tooltip
ediff-hook vc-hooks lisp-float-type mwheel x-win x-dnd font-setting
tool-bar dnd fontset image fringe lisp-mode register page menu-bar
rfn-eshadow timer select scroll-bar mldrag 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 loaddefs button
minibuffer faces cus-face text-properties overlay md5 base64 format env
code-pages mule custom widget hashtable-print-readable backquote
make-network-process dbusbind font-render-setting gtk x-toolkit x
multi-tty emacs)