bug#21415: 25.0.50; Emacs Trunk -- pixelwise width/height for x-create-frame

[martin rudalics]

> I've attached the patch, sorry for posting it in the mail.

Thank you.  Keith please try it.  If it fixes all remaining issues I'll
try to commit everything we have now next week.

> You can read more about "screen coordinates" here:
>
> 
https://developer.apple.com/library/ios/documentation/General/Conceptual/Devpedia-CocoaApp/CoordinateSystem.html

Thanks.  I'm slightly confused, at least - I have no idea what flipping
means.  Can you have a short look at the section "Frame Geometry" in the
Elisp manual?  Maybe I should mention something about this issue there.

And do you have any idea why this apparently worked in Emacs 24.5 and
doesn't work with present master/trunk?

martin