bug#12050: 23.3; font trashes mode-line file name

[Chong Yidong]

Eli Zaretskii <eliz@gnu.org> writes:

>> run -q -fn -adobe-helvetica-medium-r-normal--0-0-0-0-p-0-iso8859-15
>> crash at
>> xfaces.c:4841
>> 4841            if (! EQ (face->font->props[i], def_face->font->props[i]))
>> (gdb) print def_face->font
>> $2 = (struct font *) 0x0
>
> Thanks.
>
> Would some font selection expert please chime in?  There's some weird
> stuff going on with selecting a font for the mode line, and in
> particular the buffer name there.

I don't have Adobe Helvetica, so I can't debug this.  None of the fonts
available on my system seem to cause such problems.