bug#46436: 27.1.91; Font weight issue on MacOS Big Sur

[Arnaud Antkowiak]

Hello,

All the informations on font weight appear to be stripped out in Mac OS Big Sur 
; as a result, a single weight takes precedence over the others.
As an example, if I install say Roboto Mono Light, I can see the font via M-x 
describe-font as :

-*-Roboto Mono-bold-italic-normal-*-*-*-*-*-m-0-iso10646-1
-*-Roboto Mono-bold-normal-normal-*-*-*-*-*-m-0-iso10646-1
-*-Roboto Mono-normal-italic-normal-*-*-*-*-*-m-0-iso10646-1
-*-Roboto Mono-normal-normal-normal-*-*-*-*-*-m-0-iso10646-1

The ‘light’ weight information does not appear. As a consequence, if I now 
install Roboto Mono Regular, this is what I get:

-*-Roboto Mono-bold-italic-normal-*-*-*-*-*-m-0-iso10646-1
-*-Roboto Mono-bold-normal-normal-*-*-*-*-*-m-0-iso10646-1
-*-Roboto Mono-normal-italic-normal-*-*-*-*-*-m-0-iso10646-1
-*-Roboto Mono-normal-normal-normal-*-*-*-*-*-m-0-iso10646-1

The two fonts having the same handler, one takes precedence over the other (and 
all the text now appears as a long fat headline).
Testing the same process under macOS Catalina (the previous OS) on another 
computer, this is what I get after installing Roboto Mono Light :

-*-Roboto Mono-bold-italic-normal-*-*-*-*-*-m-0-iso10646-1
-*-Roboto Mono-bold-normal-normal-*-*-*-*-*-m-0-iso10646-1
-*-Roboto Mono-light-italic-normal-*-*-*-*-*-m-0-iso10646-1
-*-Roboto Mono-light-normal-normal-*-*-*-*-*-m-0-iso10646-1
-*-Roboto Mono-light-normal-normal-*-14-*-*-*-m-0-fontset-auto1

And after installing Roboto Mono Regular :

-*-Roboto Mono-bold-italic-normal-*-*-*-*-*-m-0-iso10646-1
-*-Roboto Mono-bold-normal-normal-*-*-*-*-*-m-0-iso10646-1
-*-Roboto Mono-light-italic-normal-*-*-*-*-*-m-0-iso10646-1
-*-Roboto Mono-light-normal-normal-*-*-*-*-*-m-0-iso10646-1
-*-Roboto Mono-light-normal-normal-*-14-*-*-*-m-0-fontset-auto1
-*-Roboto Mono-normal-italic-normal-*-*-*-*-*-m-0-iso10646-1
-*-Roboto Mono-normal-normal-normal-*-*-*-*-*-m-0-iso10646-1

The font weight information is here preserved and I can select different 
variants of the font. So it seems like the problem really pertains to MacOS Big 
Sur.
Many thanks in advance for your help,

Arnaud

——

In GNU Emacs 27.1.91 (build 1, x86_64-apple-darwin20.3.0, NS appkit-2022.30 
Version 11.2 (Build 20D64))
 of 2021-02-11 built on Arnauds-MacBook-Pro.local
Repository revision: d03f2a6ee942882c5bc78226b4730dac6f1d0916
Repository branch: emacs-27
Windowing system distributor 'Apple', version 10.3.2022
System Description:  macOS 11.2

Recent messages:
Loading /Users/antko/.emacs.d/sanity.el (source)...done
Loading /Users/antko/.emacs.d/elegance_big_sur.el (source)...
For information about GNU Emacs and the GNU system, type C-h C-a.
Making completion list...
End of buffer [7 times]
Quit
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