bug#40200: [PATCH v4] Fix NS frame resizing issues (bug#40200, bug#28872)

[Andrii Kolomoiets]

Alan Third <alan@idiocy.org> writes:

> Out of interest, do you have a test suite, or are you just coming up
> with these tests on the fly?

I'm using these minor modes which utilize child frame to display
minibuffer and completions buffer:
https://github.com/muffinmad/emacs-mini-frame
https://github.com/muffinmad/emacs-completions-frame

Single child frame moves across all frames so child frame positioning
issues are quickly comes in sight for me.  And then the fun part: narrow
down the code so the issue can be reproduced in `emacs -Q`.

The patch v4 works good so far, thank you!