bug#15788: 24.3.50; Can't change the default face's attributes

[Eli Zaretskii <eliz@gnu.org>]

> Date: Sat, 02 Nov 2013 13:12:25 +0100
> From: Jan Djärv <jan.h.d@swipnet.se>
> CC: 15788@debbugs.gnu.org
> 
> What is the value of attrs[LFACE_DISTANT_FOREGROUND_INDEX])?

I've shown it at the end of the backtrace I sent: the value is nil.
Here:

> >    #2  0x010d6a49 in check_lface_attrs (attrs=0x379ab54) at xfaces.c:1808
> >    1808      eassert (UNSPECIFIEDP (attrs[LFACE_DISTANT_FOREGROUND_INDEX])
> >    (gdb) l
> >    1803               || IGNORE_DEFFACE_P (attrs[LFACE_INVERSE_INDEX])
> >    1804               || SYMBOLP (attrs[LFACE_INVERSE_INDEX]));
> >    1805      eassert (UNSPECIFIEDP (attrs[LFACE_FOREGROUND_INDEX])
> >    1806               || IGNORE_DEFFACE_P (attrs[LFACE_FOREGROUND_INDEX])
> >    1807               || STRINGP (attrs[LFACE_FOREGROUND_INDEX]));
> >    1808      eassert (UNSPECIFIEDP (attrs[LFACE_DISTANT_FOREGROUND_INDEX])
> >    1809               || IGNORE_DEFFACE_P (attrs[LFACE_DISTANT_FOREGROUND_INDEX])
> >    1810               || STRINGP (attrs[LFACE_DISTANT_FOREGROUND_INDEX]));
> >    1811      eassert (UNSPECIFIEDP (attrs[LFACE_BACKGROUND_INDEX])
> >    1812               || IGNORE_DEFFACE_P (attrs[LFACE_BACKGROUND_INDEX])
> >    (gdb) p attrs[LFACE_DISTANT_FOREGROUND_INDEX]
> >    $1 = 56191002
> >    (gdb) xtype
> >    Lisp_Symbol
> >    (gdb) xsymbol
> >    $2 = (struct Lisp_Symbol *) 0x3596818
> >    "nil"