On Fri, Mar 09, 2018 at 04:32:10PM +0330, Rudi C wrote:
>
> Fullscreen on macOS has two black bars on the top and bottom. Emacs Mac
> Port doesn't have this issue.

I believe the problem is that the resize to fullscreen is constrained
to full character sizes.

Try setting this then switching to fullscreen:

    (setq frame-resize-pixelwise t)

--
Alan Third