bug#45068: [PATCH] 28.0.50; Update Modus themes 1.0.2 (backward-incompatible)

[Eli Zaretskii]

> From: Stefan Kangas <stefankangas@gmail.com>
> Date: Fri, 11 Dec 2020 08:16:47 -0600
> Cc: juri@linkov.net, info@protesilaos.com, contovob@tcd.ie, 
>       45068@debbugs.gnu.org
> 
> Right.  Well, I don't exactly have a strong opinion either way.  But I
> do think that we should be consistent: it would be confusing to have
> some themes in "etc/themes" and some in "lisp/themes".

Why not have all of them in etc/themes?

> If we can't move all themes to "lisp/themes" and we don't want to use
> "lisp/themes" just for support files, to my mind the only remaining way
> forward is to add some way to byte-compile (perhaps only some?) files in
> "etc/themes".

What theme-related files need to be byte-compiled, and why?