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

[Eli Zaretskii]

> From: Lars Ingebrigtsen <larsi@gnus.org>
> Cc: tumashu@163.com,  luangruo@yahoo.com,  51821@debbugs.gnu.org
> Date: Sat, 20 Nov 2021 09:51:39 +0100
> 
> Eli Zaretskii <eliz@gnu.org> writes:
> 
> > Shouldn't it be enough to check that the face's height is less than 2
> > pixels, and if so, not to enlarge the height?
> 
> Perhaps, but I'm pretty sure that on this HiDPI screen, the separator
> line height is about... four? pixels high.

Well, the value 2 above was just arbitrary; we could use 4 instead.

> Yup.  But perhaps it would make sense to allow for :pixel-height in any
> case -- it'd be one less thing to worry about when figuring our options
> when trying to get to a solution.

Not sure I understand what you mean by "allow foe :pixel-height" here.