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

[Eli Zaretskii]

> From: "Matsievskiy S.V." <seregaxvm.main@gmail.com>
> Date: Sat, 18 Dec 2021 14:50:41 +0300
> 
> When buffer contains SVG overlay with Unicode characters, changing font
> size via `text-scale-increase` and `text-scale-decrease` causes these
> Unicode characters to change size unproportionally to the Latin
> characters. Their size changes faster: they shrink faster then Latin
> characters and they grow faster then Latin characters.
> Example of the math equation containing Unicode characters with
> different scale is showin in picture https://imgur.com/3Ul8i74.
> 
> Way to reproduce:

Could you please post the Lisp code as an attachment, not inline, and
not in Org or Markdown format, but as plain Lisp code?  I tried to
reproduce the problem, but the NBSP characters and probably something
else in your mail made the image unreadable, so I couldn't
investigate.

Thanks.