GNU bug report logs - #45920
28.0.50; set-face-attribute cannot read :family when different :weight exist

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From: help-debbugs <at> gnu.org (GNU bug Tracking System)
To: Protesilaos Stavrou <info <at> protesilaos.com>
Subject: bug#45920: closed (Re: bug#45920: 28.0.50; set-face-attribute
 cannot read :family when different :weight exist)
Date: Sun, 17 Jan 2021 03:30:02 +0000

[Message part 1 (text/plain, inline)]

Your bug report

#45920: 28.0.50; set-face-attribute cannot read :family when different :weight exist

which was filed against the emacs package, has been closed.

The explanation is attached below, along with your original report.
If you require more details, please reply to 45920 <at> debbugs.gnu.org.

-- 
45920: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=45920
GNU Bug Tracking System
Contact help-debbugs <at> gnu.org with problems

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From: Eli Zaretskii <eliz <at> gnu.org>
To: Protesilaos Stavrou <info <at> protesilaos.com>
Cc: 45920-done <at> debbugs.gnu.org
Subject: Re: bug#45920: 28.0.50; set-face-attribute cannot read :family when
 different :weight exist
Date: Sun, 17 Jan 2021 05:29:20 +0200

> From: Protesilaos Stavrou <info <at> protesilaos.com>
> Cc: 45920 <at> debbugs.gnu.org
> Date: Sat, 16 Jan 2021 23:02:24 +0200
> 
> Following your input, I tried alternating between those two and they
> both give me the right results:
> 
>    (progn
>      (internal-set-lisp-face-attribute 'default :family "Source Code Pro" 0)
>      (internal-set-lisp-face-attribute 'default :weight 'light 0))
>    
>    (progn
>      (internal-set-lisp-face-attribute 'default :weight 'normal 0)
>      (internal-set-lisp-face-attribute 'default :family "Hack" 0))
> 
> Please feel free to close this.

Done.

[Message part 3 (message/rfc822, inline)]

From: Protesilaos Stavrou <info <at> protesilaos.com>
To: bug-gnu-emacs <at> gnu.org
Subject: 28.0.50; set-face-attribute cannot read :family when different
 :weight exist
Date: Sat, 16 Jan 2021 22:09:54 +0200

Dear maintainers,

I have noticed that setting fonts via 'set-face-attribute' works as
intended except in the following scenario (on 'emacs -Q'):

   ;; Sample 1
   (set-face-attribute 'default nil
                       :family "Source Code Pro"
                       :weight 'light)

   ;; Sample 2
   (set-face-attribute 'default nil
                       :family "Hack"
                       :weight 'normal)

If you evaluate sample 1, you will get the desired behaviour.  Namely,
the font family for the default face is the one specified, as is the
typographic weight.

Now if you proceed to evaluate sample 2, you will notice that only the
weight gets updated.  The family continues to be that of sample 1.

At this point, to get the family of sample 2, you need to evaluate
sample 2 one more time.

I tried various combinations and my impression is that the problem
occurs when the :weight properties are different.  Other properties,
such as :height, do not exhibit this behaviour.

Can you reproduce this on your end?

All the best,
Protesilaos

-- 
Protesilaos Stavrou
protesilaos.com

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