Re: Increase default `line-spacing' to 0.05, 0.10 or 0.15 [proposal]

[Eli Zaretskii]

> From: Stefan Kangas <stefan@marxist.se>
> Date: Tue, 4 May 2021 10:57:51 -0500
> 
> Emacs by default uses a leading of the font size + a few pixels (the
> `line-spacing' variable is 0).

I don't understand this (or disagree): AFAIU, by default line-spacing
is strictly zero, and we don't add anything to the font size.  If you
see something else in the code, can you point me to the code which I'm
missing, and which implements that default line-spacing?