Re: [ELPA] Add fontaine package?

[Protesilaos Stavrou]

> From: Eli Zaretskii <eliz@gnu.org>
> Date: Fri, 29 Apr 2022 10:15:33 +0300
>
>> > Sorry, I meant set-face-attribute, of course.
>> 
>> The reason I did not use it is due to what we discussed in bug#45920.
>> Basically, set-face-attribute needs to be evaluated twice when (i) we
>> change the :family, (ii) change the :weight, and (iii) the new family
>> does not have the weight of the previous one.
>> 
>> The example I used in that bug report, which I can still reproduce with
>> 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)
>> 
>> Evaluate sample 1.  It works.  Now evaluate sample 2.  Notice that it
>> does not yield the expected result.  Evaluate sample 2 again: the result
>> is the desired one.
>> 
>> By using internal-set-lisp-face-attribute, I specify the sequence of
>> events that always works.
>> 
>> Perhaps there is a better way to handle this edge case?
>
> What exactly is the "edge case", and why do you need it in this
> package?

It is possible to have a typeface that has a light weight and another
that hasn't.  If the user defines two presets in fontaine-presets and
tries to switch from the one with the light weight to the other without
it, they will encounter the aforementioned behaviour of
set-face-attribute.

-- 
Protesilaos Stavrou
https://protesilaos.com