bug#28512: 26.0.60; undecorated frames on macOS 10.13 do not resize properly

[Alan Third]

On Tue, Sep 19, 2017 at 08:10:08AM -0700, Aaron Jensen wrote:
> 
> Create a file named 'repro.el' containing:
> 
>     (add-to-list 'initial-frame-alist '(top . 22))
>     (add-to-list 'initial-frame-alist '(left . 0))
>     (add-to-list 'initial-frame-alist '(width . (text-pixels . 800)))
>     (add-to-list 'initial-frame-alist '(height . (text-pixels . 800)))
>     (add-to-list 'initial-frame-alist undecorated . t)
> 
> Run 'emacs -Q -l repro.el'
> 
> You should observe this:
> https://screenshots-dx37.s3.amazonaws.com/20170919-080719-50kui.png
> 
> If you click anywhere in the white area to the right of the scrollbar or
> below the modeline the click "passes through" emacs. That is, anything
> behind it will receive the click.
> 
> On 10.12, this was not a problem. I know that 10.13 isn't officially out
> yet, but this is the GM candidate and Emacs 26 is coming out soon with
> this being one of the new features. It'd be great if it worked on 10.13.
> I'm happy to test patches if anyone has ideas.

I can actually reproduce on 10.12. The last line should be:

   (add-to-list ’initial-frame-alist ’(undecorated . t))
-- 
Alan Third