bug#29716: 25.1; Wrong brackground-mode on gnome-terminal

[semente <semente@riseup.net>]

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Please write in English if possible, as the Emacs maintainers
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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':

On gnome-terminal 3.22.2 (Debian Stretch), for some reason, Emacs 
is
setting the background-mode to light when I'm running a dark
background. On xterm or ttys it works fine.

The only way I found to fix this is by forcing a dark mode, as for
example:

  (setq frame-background-mode 'dark)
  (set-background-color "black")
  (set-foreground-color "white")

Thanks,
semente

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/25.1/etc/DEBUG.


In GNU Emacs 25.1.1 (x86_64-pc-linux-gnu, GTK+ Version 3.22.11)
 of 2017-09-15, modified by Debian built on trouble
System Description:     Debian GNU/Linux 9.3 (stretch)

Configured using:
 'configure --build x86_64-linux-gnu --prefix=/usr
 --sharedstatedir=/var/lib --libexecdir=/usr/lib
 --localstatedir=/var/lib --infodir=/usr/share/info
 --mandir=/usr/share/man --with-pop=yes
 --enable-locallisppath=/etc/emacs25:/etc/emacs:/usr/local/share/emacs/25.1/site-lisp:/usr/loca\
l/share/emacs/site-lisp:/usr/share/emacs/25.1/site-lisp:/usr/share/emacs/site-lisp
 --with-sound=alsa --build x86_64-linux-gnu --prefix=/usr
 --sharedstatedir=/var/lib --libexecdir=/usr/lib
 --localstatedir=/var/lib --infodir=/usr/share/info
 --mandir=/usr/share/man --with-pop=yes
 --enable-locallisppath=/etc/emacs25:/etc/emacs:/usr/local/share/emacs/25.1/site-lisp:/usr/loca\
l/share/emacs/site-lisp:/usr/share/emacs/25.1/site-lisp:/usr/share/emacs/site-lisp
 --with-sound=alsa --with-x=yes --with-x-toolkit=gtk3
--with-toolkit-scroll-bars 'CFLAGS=-g -O2
 -fdebug-prefix-map=/build/emacs25-wN2qS3/emacs25-25.1+1=. -fstack-protector-strong
 -Wformat -Werror=format-security -Wall' 'CPPFLAGS=-Wdate-time
 -D_FORTIFY_SOURCE=2' LDFLAGS=-Wl,-z,relro'

Configured features:
XPM JPEG TIFF GIF PNG RSVG IMAGEMAGICK SOUND GPM DBUS GCONF 
GSETTINGS
NOTIFY ACL LIBSELINUX GNUTLS LIBXML2 FREETYPE M17N_FLT LIBOTF XFT 
ZLIB
TOOLKIT_SCROLL_BARS GTK3 X11

Important settings:
  value of $LC_MONETARY: pt_BR.UTF-8
  value of $LC_NUMERIC: pt_BR.UTF-8
  value of $LC_TIME: pt_BR.UTF-8
  value of $LANG: en_US.UTF-8
  locale-coding-system: utf-8-unix

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
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  line-number-mode: t
  transient-mark-mode: t

Recent messages:
For information about GNU Emacs and the GNU system, type C-h C-a.

Load-path shadows:
None found.

Features:
(shadow sort mail-extr emacsbug message dired format-spec rfc822 
mml
mml-sec password-cache epg epg-config gnus-util mm-decode 
mm-bodies
mm-encode mail-parse rfc2231 mailabbrev gmm-utils mailheader 
sendmail
rfc2047 rfc2045 ietf-drums mm-util help-fns help-mode easymenu
cl-loaddefs pcase cl-lib mail-prsvr mail-utils term/xterm xterm
time-date mule-util tooltip eldoc electric uniquify ediff-hook 
vc-hooks
lisp-float-type mwheel x-win term/common-win x-dnd tool-bar dnd 
fontset
image regexp-opt fringe tabulated-list newcomment elisp-mode 
lisp-mode
prog-mode register page menu-bar rfn-eshadow timer select 
scroll-bar
mouse jit-lock font-lock syntax facemenu font-core 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 charscript case-table 
epa-hook
jka-cmpr-hook help simple abbrev 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 dbusbind inotify 
dynamic-setting
system-font-setting font-render-setting move-toolbar gtk x-toolkit 
x
multi-tty make-network-process emacs)

Memory information:
((conses 16 91298 7489)
 (symbols 48 19941 0)
 (miscs 40 46 172)
 (strings 32 14764 4115)
 (string-bytes 1 415527)
 (vectors 16 9779)
 (vector-slots 8 386436 16291)
 (floats 8 166 523)
 (intervals 56 251 0)
 (buffers 976 20))