[Bug-AUCTeX] 11.86; XeTeX engine doesn't use Emacs foreground color

[XeCycle]

Any simple LaTeX document containing a preview-able part can
reproduce this.

Steps to reproduce:

1. Set Emacs foreground color to non-black and background
   accordingly.

2. Open some LaTeX file, with some math formula.

3. Set variable TeX-engine to 'xetex, and TeX-PDF-mode to t,
   press C-c C-p C-d.  (Maybe twice is needed)

OK, and you'll see the preview's foreground color is black, not
the Emacs foreground.

Emacs  : GNU Emacs 24.0.93.1 (x86_64-unknown-linux-gnu, GTK+ Version 3.2.3)
 of 2012-02-25 on XeCycle
Package: 11.86

current state:
==============
(setq
 AUCTeX-version "11.86"
 LaTeX-command-style '(("" "%(PDF)%(latex) %S%(PDFout)"))
 image-types '(svg imagemagick png gif tiff jpeg xpm postscript xbm pbm)
 preview-image-type 'png
 preview-image-creators '((dvipng
                           (open preview-gs-open preview-dvipng-process-setup)
                           (place preview-gs-place)
                           (close preview-dvipng-close))
                          (png (open preview-gs-open) (place preview-gs-place)
                           (close preview-gs-close))
                          (jpeg (open preview-gs-open)
                           (place preview-gs-place) (close preview-gs-close))
                          (pnm (open preview-gs-open) (place preview-gs-place)
                           (close preview-gs-close))
                          (tiff (open preview-gs-open)
                           (place preview-gs-place) (close preview-gs-close))
                          )
 preview-dvipng-image-type 'png
 preview-dvipng-command "dvipng -picky -noghostscript %d -o 
\"%m/prev%%03d.png\""
 preview-pdf2dsc-command "pdf2dsc %s.pdf %m/preview.dsc"
 preview-gs-command "gs"
 preview-gs-options '("-q" "-dDELAYSAFER" "-dNOPAUSE" "-DNOPLATFONTS"
                      "-dPrinted" "-dTextAlphaBits=4" "-dGraphicsAlphaBits=4")
 preview-gs-image-type-alist '((png png "-sDEVICE=png16m")
                               (dvipng png "-sDEVICE=png16m")
                               (jpeg jpeg "-sDEVICE=jpeg")
                               (pnm pbm "-sDEVICE=pnmraw")
                               (tiff tiff "-sDEVICE=tiff12nc"))
 preview-fast-conversion t
 preview-prefer-TeX-bb nil
 preview-dvips-command "dvips -Pwww -i -E %d -o %m/preview.000"
 preview-fast-dvips-command "dvips -Pwww %d -o %m/preview.ps"
 preview-scale-function 'preview-scale-from-face
 preview-LaTeX-command '("%`%l \"\\nonstopmode\\nofiles\\PassOptionsToPackage{"
                         ("," . preview-required-option-list)
                         
"}{preview}\\AtBeginDocument{\\ifx\\ifPreview\\undefined" 
preview-default-preamble "\\fi}\"%' %t")
 preview-required-option-list '("active" "tightpage" "auctex"
                                (preview-preserve-counters "counters"))
 preview-preserve-counters nil
 preview-default-option-list '("displaymath" "floats" "graphics" "textmath"
                               "sections" "footnotes")
 preview-default-preamble '("\\RequirePackage["
                            ("," . preview-default-option-list)
                            "]{preview}[2004/11/05]")
 preview-LaTeX-command-replacements nil
 preview-dump-replacements '(preview-LaTeX-command-replacements
                             ("\\`\\([^ ]+\\)\\(\\( +-\\([^ 
\\\\\"]\\|\\\\\\.\\|\"[^\"]*\"\\)*\\)*\\)\\(.*\\)\\'" "\\1 -ini 
-interaction=nonstopmode \"&\\1\" " preview-format-name ".ini \\5")
                             )
 preview-undump-replacements '(("\\`\\([^ ]+\\) .*? \"\\\\input\" \\(.*\\)\\'"
                                "\\1 -interaction=nonstopmode \"&"
                                preview-format-name "\" \\2")
                               )
 preview-auto-cache-preamble 'ask
 preview-TeX-style-dir nil
 )

Output from running `gs -h':
GPL Ghostscript 9.05 (2012-02-08)
Copyright (C) 2010 Artifex Software, Inc.  All rights reserved.
Usage: gs [switches] [file1.ps file2.ps ...]
Most frequently used switches: (you can use # in place of =)
 -dNOPAUSE           no pause after page   | -q       `quiet', fewer messages
 -g<width>x<height>  page size in pixels   | -r<res>  pixels/inch resolution
 -sDEVICE=<devname>  select device         | -dBATCH  exit after last file
 -sOutputFile=<file> select output file: - for stdout, |command for pipe,
                                         embed %d or %ld for page #
Input formats: PostScript PostScriptLevel1 PostScriptLevel2 PostScriptLevel3 PDF
Default output device: x11alpha
Available devices:
   alc1900 alc2000 alc4000 alc4100 alc8500 alc8600 alc9100 ap3250 appledmp
   atx23 atx24 atx38 bbox bit bitcmyk bitrgb bitrgbtags bj10e bj10v bj10vh
   bj200 bjc600 bjc800 bjc880j bjccmyk bjccolor bjcgray bjcmono bmp16 bmp16m
   bmp256 bmp32b bmpgray bmpmono bmpsep1 bmpsep8 ccr cdeskjet cdj1600 cdj500
   cdj550 cdj670 cdj850 cdj880 cdj890 cdj970 cdjcolor cdjmono cdnj500 cfax
   chp2200 cif cljet5 cljet5c cljet5pr coslw2p coslwxl cp50 cups declj250
   deskjet devicen dfaxhigh dfaxlow dj505j djet500 djet500c dl2100 dnj650c
   epl2050 epl2050p epl2120 epl2500 epl2750 epl5800 epl5900 epl6100 epl6200
   eplcolor eplmono eps9high eps9mid epson epsonc epswrite escp escpage
   faxg3 faxg32d faxg4 fmlbp fmpr fs600 gdi hl1240 hl1250 hl7x0 hpdj1120c
   hpdj310 hpdj320 hpdj340 hpdj400 hpdj500 hpdj500c hpdj510 hpdj520 hpdj540
   hpdj550c hpdj560c hpdj600 hpdj660c hpdj670c hpdj680c hpdj690c hpdj850c
   hpdj855c hpdj870c hpdj890c hpdjplus hpdjportable ibmpro ijs imagen
   inferno inkcov iwhi iwlo iwlq jetp3852 jj100 jpeg jpegcmyk jpeggray la50
   la70 la75 la75plus laserjet lbp310 lbp320 lbp8 lex2050 lex3200 lex5700
   lex7000 lips2p lips3 lips4 lips4v lj250 lj3100sw lj4dith lj4dithp lj5gray
   lj5mono ljet2p ljet3 ljet3d ljet4 ljet4d ljet4pjl ljetplus ln03 lp1800
   lp1900 lp2000 lp2200 lp2400 lp2500 lp2563 lp3000c lp7500 lp7700 lp7900
   lp8000 lp8000c lp8100 lp8200c lp8300c lp8300f lp8400f lp8500c lp8600
   lp8600f lp8700 lp8800c lp8900 lp9000b lp9000c lp9100 lp9200b lp9200c
   lp9300 lp9400 lp9500c lp9600 lp9600s lp9800c lps4500 lps6500 lq850
   lxm3200 lxm5700m m8510 mag16 mag256 md1xMono md2k md50Eco md50Mono md5k
   mgr4 mgr8 mgrgray2 mgrgray4 mgrgray8 mgrmono miff24 mj500c mj6000c
   mj700v2c mj8000c ml600 necp6 npdl nullpage oce9050 oki182 oki4w okiibm
   omni oprp opvp paintjet pam pamcmyk32 pamcmyk4 pbm pbmraw pcl3 pcx16
   pcx24b pcx256 pcx256 pcx2up pcxcmyk pcxgray pcxmono pdfwrite pdfwrite pgm
   pgmraw pgnm pgnmraw photoex picty180 pj pjetxl pjxl pjxl300 pkm pkmraw
   pksm pksmraw plan plan9bm planc plang plank planm png16 png16m png256
   png48 pngalpha pnggray pngmono pnm pnmraw ppm ppmraw pr1000 pr1000_4
   pr150 pr201 ps2write psdcmyk psdrgb psgray psmono psrgb pswrite pxlcolor
   pxlmono r4081 rinkj rpdl samsunggdi sgirgb sj48 spotcmyk st800 stcolor
   sunhmono t4693d2 t4693d4 t4693d8 tek4696 tiff12nc tiff24nc tiff32nc
   tiff48nc tiff64nc tiffcrle tiffg3 tiffg32d tiffg4 tiffgray tifflzw
   tiffpack tiffscaled tiffscaled24 tiffscaled8 tiffsep tiffsep1 txtwrite
   uniprint x11 x11alpha x11cmyk x11cmyk2 x11cmyk4 x11cmyk8 x11gray2
   x11gray4 x11mono xcf xes
Search path:
   /usr/share/ghostscript/9.05/Resource/Init :
   /usr/share/ghostscript/9.05/lib :
   /usr/share/ghostscript/9.05/Resource/Font :
   /usr/share/ghostscript/fonts : /usr/share/fonts/Type1 : /usr/share/fonts
For more information, see /usr/share/ghostscript/9.05/doc/Use.htm.
Please report bugs to bugs.ghostscript.com.

-- 
Carl Lei (XeCycle)
Department of Physics, Shanghai Jiao Tong University
OpenPGP public key: 7795E591
Fingerprint: 1FB6 7F1F D45D F681 C845 27F7 8D71 8EC4 7795 E591

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