On Fri, Oct 20, 2017 at 3:55 AM, martin rudalics <rudalics@gmx.at> wrote:

> Ok. It would be more helpful if you explained which problems you feel are
> relevant to the discussion at hand.

For example that of getting the screen dimensions of a window. Have a
look at x_real_pos_and_offsets to get an idea of the tribulations needed
to do that for an Emacs frame. These are by far the most complicated
operations we do in the X specific code and I have reports that we still
do not get the right results everywhere.

​Yes, I see.  I am having similar issues when trying to replicate the size of a frame under the macOS window system.  I can't seem to get the new frame to match the old frame by using (frame-edges nil 'outer-edges) or (frame-edges nil 'native-edges).  In earlier versions of Emacs, I don't remember this being a problem but I can't recall when that was.  What is the best way available to replicate the size of one frame to another given the limitations that exist now?

Bob