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

[Lars Ingebrigtsen]

"Matsievskiy S.V." <seregaxvm.main@gmail.com> writes:

> 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.

The SVG seems to be very odd without changing the font size.  When I
eval the test case, I get:

Is it supposed to look this way?

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