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From: Eli Zaretskii <eliz@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: set-frame-size should respect line-spacing!?
Date: Sat, 12 Oct 2019 10:48:33 +0300
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To: Ingo Lohmar <ingo.lohmar@posteo.net>
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> From: Ingo Lohmar <ingo.lohmar@posteo.net>
> Cc: emacs-devel@gnu.org
> Date: Sat, 12 Oct 2019 09:12:17 +0200
> 
> Are you saying `set-frame-size' is supposed to ignore line-spacing?

Yes.  This part of the doc string hints on that, perhaps too
indirectly:

  When ‘frame-resize-pixelwise’ is nil, some window managers may refuse to
  honor a WIDTH that is not an integer multiple of the default frame font
  width or a HEIGHT that is not an integer multiple of the default frame
  font height.

> In that case, what is the correct way to set the frame-size in the
> pixel-exact way?

Use the optional argument PIXELWISE, and calculate the frame size in
pixels yourself.