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

[Stephen Berman]

On Sun, 19 Dec 2021 12:15:19 +0100 Lars Ingebrigtsen <larsi@gnus.org> wrote:

> "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.

I can reproduce the problem:

svg.png
Description: PNG image

This is with Emacs 29.0.50, librsvg-2.50.6, GTK+ 3.24.29, cairo 1.17.4

Steve Berman