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From: Eli Zaretskii <eliz@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: prettify-symbols-mode, derived modes, and compose-region
Date: Fri, 05 Mar 2021 09:25:23 +0200
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Cc: d.williams@posteo.net, monnier@iro.umontreal.ca, emacs-devel@gnu.org
To: Stefan Kangas <stefankangas@gmail.com>
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 (message from Stefan Kangas on Thu, 4 Mar 2021 19:20:22 -0800)
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> From: Stefan Kangas <stefankangas@gmail.com>
> Date: Thu, 4 Mar 2021 19:20:22 -0800
> Cc: Eli Zaretskii <eliz@gnu.org>, emacs-devel@gnu.org
> 
> Stefan Monnier <monnier@iro.umontreal.ca> writes:
> 
> > You should definitely try, but I suspect it's not going to work
> > well: [...]
> 
> Another thing to be aware of is that the :align-to doesn't adjust when
> you change the font size with `text-scale-adjust'.

I think it should adjust if you specify the value in columns, not in
pixels.  You can also specify the width of the whitespace stretch in
'width' units, which stands for the canonical width of the current
face (assuming that the current face is itself affected by
text-scale-adjust).