bug#52599: 29.0.50; Unproportional Unicode character scale in SVG overlay

[Eli Zaretskii]

> From: "Matsievskiy S.V." <seregaxvm.main@gmail.com>
> Cc: 52599@debbugs.gnu.org
> Date: Sat, 18 Dec 2021 15:13:15 +0300
> 
> Attaching ELisp code

Thanks.

In my testing, the size of the font in the image doesn't change at all
when I increase or decrease the text scale in the buffer.

I think whether the font changes is up to librsvg and the font backend
it uses, and Emacs does not necessarily have a way of controlling
that.  But I'm not an expert on SVG and the library, so perhaps
someone else could chime in.