bug#39921: 27.0.90; Cannot start with non-native toggle-frame-fullscreen on macOS

[Alan Third]

"Michael Sanders" writes:

> On macOS, it doesn’t seem to be possible to specify an
> `initial-frame-alist` that starts Emacs in “non-native” fullscreen
> mode (i.e., without the system animation and taking up a separate
> Space in Mission Control). To see the difference, use
> `toggle-frame-fullscreen` which has the desired behavior. This can be
> compared with clicking the green fullscreen icon on the window, which
> will use the system fullscreen. On the emacs-mac port by Yamamoto
> Mitsuharu, it’s possible to specify the following to start in this
> mode:
>
> ```
> (setq initial-frame-alist '((fullscreen . fullboth)))
> ```
>
> However, both this and `(setq initial-frame-alist '((fullscreen .
> fullscreen)))` do not have this effect on the main build of Emacs.
> They always use the system fullscreen.

Does setting ns-use-native-fullscreen have no effect?

-- 
Alan Third