[macOS] Add exclusive fullscreen mode with Dock and Menu disabled.

[bruvzg]

Fixes #68254

[akien-mga]

Would be interesting to also have this implemented for 3.x somehow (not sure how since we don't have exclusive fullscreen there).

[bruvzg]

Would be interesting to also have this implemented for 3.x somehow (not sure how since we don't have exclusive fullscreen there).

I guess 3.x always use exclusive fs on Windows, so it probably should always do it on macOS as well (but I would keep window title button to work without setting presentation mode, since it's more expected behavior).

[bruvzg]

Actually not fully sure about setting NSApplicationPresentationDisableProcessSwitching, it's disabling Exposé hot corners (which is probably as desired as disabling Dock and Menu), but also disabling switching app with Cmd+Tab (which night be too much, Force Quit is still accessible, so it's not locking up the system).

[akien-mga]

How do other non-Godot games behave typically on macOS for this?

[bruvzg]

How do other non-Godot games behave typically on macOS for this?

Seems like most of the games I have tested do not block Expose, so I have removed it as well.

[akien-mga]

Thanks!