On Sat, Jan 30, 2021 at 9:26 AM martin rudalics <rudalics@gmx.at> wrote:
>
>  > (make-frame `(
>  >            (parent-frame . ,(window-frame))
>  >            (child-frame-border-width . 0)
>  >            (internal-border-width . 200)))
>  >
>  > I would expect the border width to only fall back if
>  > child-frame-border-width is nil, since 0 is a useful setting.
>
> It's not entirely trivial to do that (frame parameters are a pain in
> this regard) but please have a look at the attached patch (tested on a
> GTK build only).  Alexander, please have a look too.

That worked for me, thanks. I had to also apply the attached to get it
to compile on macOS.

Aaron