bug#12349: 24.2.50; Italic face is underlined instead of slanted

[Stephen Berman]

On Sun, 04 Nov 2012 13:35:19 +0800 Chong Yidong <cyd@gnu.org> wrote:

> Stephen Berman <stephen.berman@gmx.net> writes:
>
>> When I start Emacs with my init file or with -q, doing `M-x
>> customize-face RET italic' shows this:
>>
>> Hide italic face: [sample]
>>     State : STANDARD.
>>    Basic italic face.
>>    [X] Underline: Value Menu On:
>>
>> This behavior began with my build from bzr trunk revision 109818.
>
> That doesn't look right; 109818 is a doc fix to compile.el.

Sorry for the confusion; I meant that the problem appeared no later than that
revision (there are usually many revisions between my Emacs builds).

>> (setq default-frame-alist
>>       '((font . "Dejavu Sans Mono-9") (font-backend . "xft")))
>>
>> which suffices, in my build from revision 109703, to show italic as
>> slanted; but since revision 109818, italic is shown as underlined even
>> with the above sexp.
>>
>> I ran bzr bisect, and if I used it correctly (which I'm not sure of), it
>> appears to implicate revision 109788:
>>
>> On revision 109788 (dmantipov@yandex.ru-20120827041533-3cy7pdjdqz14o90c):    
>>   
>> Special MEM_TYPE_SPARE to denote reserved memory.
>> * alloc.c (enum mem_type): New memory type.
>> (refill_memory_reserve): Use new type for spare memory.
>> This prevents live_cons_p and live_string_p from incorrect
>> detection of uninitialized objects from spare memory as live.
>
> This makes no sense either; Dmitry's patch does not touch any part of
> the code which can affect the behavior you're describing.  Are you sure
> you are bisecting correctly?

Now I'm sure I didn't do it right; when I have time I'll try to do a
proper bisection.

>> my system (openSUSE 12.1) has this in /usr/share/X11/app-defaults/Emacs:
>>
>> Emacs.Font:                     fontset-16
>> [...]
>> Emacs*Fontset-0:\
>>         -*-fixed-medium-r-*--16-*-*-*-*-*-fontset-16,\
>
> I guess openSUSE is still catering to pre-Xft (< 23.1) Emacs.  You
> should be able to safely remove the Emacs.Font setting (or do
> `xrdb -remove'), so that Emacs uses xft fonts by default.

It also works to put `Emacs.FontBackend: xft' in ~/.Xresources.  Yet
that wasn't necessary before whichever change between revisions 109704
and 109818 made italics show up as underlined even when setting
default-frame-alist in my init file as above.  I hope I have time to
track down which revision is responsible.

Steve Berman