On Thu, Nov 07, 2019 at 03:58:02PM +0200, Eli Zaretskii wrote:
>> Cc: 37774@debbugs.gnu.org
>> From: martin rudalics <rudalics@gmx.at>
>> Date: Wed, 6 Nov 2019 18:06:04 +0100
>>
>> One surprising effect with recent master is that with emacs -Q
>> evaluating
>>
>> (custom-set-faces
>>   '(font-lock-comment-face ((((class color) (background light)) (:background "Beige" :foreground "Black")))))
>>
>> makes the comment background extend to the end of the window.  This
>> means that unless I explicitly supply :extend nil, the behavior is as
>> with Emacs 26.  Is that intended?
>
>No, of course it isn't intended.
>
>Jimmy, are you looking into this?  It sounds like there's a difference
>with processing the :extend attribute when its value is 'unspecified'
>and when it's nil.  Because just adding
>
>  (set-face-extend 'FOO nil)
>
>for the faces named by Jonas and Martin makes the problem go away, and
>the faces aren't extended, as I'd expect.
>
>Let me know if you need help in debugging or resolving this.
>
>Thanks.

Hi:

Please try the attached patch. (I'm in a network where I can't use git
now.)

Best,
Ergus