Subject: Re: bug#51490: Show an indicator when Emacs is busy somewhere in the Emacs window

From: Eli Zaretskii <[email-masked]>
Date: Thu, 22 Sep 2022 15:33:42 +0300

> From: Lars Ingebrigtsen <[email-masked]>
> Cc: Gregory Heytings <[email-masked]>,  [email-masked],
>   [email-masked]
> Date: Thu, 22 Sep 2022 12:54:41 +0200
> 
> Eli Zaretskii <[email-masked]> writes:
> 
> >> Aren't they the simplest graphical element drawn by Emacs, a simple 
> >> black-and-white bitmap?
> >
> > No, they aren't.  They are certainly not black-and-white: they use
> > faces.
> 
> They use faces to get at the colours, but nothing beyond that, I think?

Yes, only the colors.  But accessing the faces means you cannot do
that while the Lisp machine is doing something.