bug#51821: 29.0.50; Suggest add variable or frame parameter: line-height

[Lars Ingebrigtsen]

Eli Zaretskii <eliz@gnu.org> writes:

> No, float values are relative to the default face, which is not what
> you want.  I meant ":height 1" or somesuch.  If that is not good
> enough, the value of :height can be a function.

If we're going to be scaling stuff, it'd be nice if there was a setting
that was clearly non-scaleable.  An integer value to :height would be
possible, but pretty error-prone, so I'd rather introduce a new keyword.

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