GraphicsDeviceManager.ToggleFullScreen doesn't revert to windowed mode on OSX

[Chicken-Bones]

Running on OSX (v26.0.0) Arm64
SDL_GPU Driver: Metal
Metal Device: Apple M1
FNA 25.08
SDL 3.2.21

For example, on a 1440x900 screen. Toggling to fullscreen 1024x640 works correctly, the display is scaled up by 1.4x to fill the screen.
Toggling back to windowed does not restore the window borders. Instead, the 1024x640 area is rendered in the top left of a 1440x900 fullscreen view, with the remaining area black. graphics.IsFullScreen changes from true to false, but the OSX window manager still thinks the application is running fullscreen. If you three finger swipe up to see different desktops, the game is shown as a fullscreen app, and you can click the >< icon on it to revert it to windowed form.

[flibitijibibo]

I did notice a lot of macOS 26 and fullscreen changes in SDL recently...

https://github.com/libsdl-org/SDL/releases

I think this is a mixture of macOS and SDL. If latest fnalibs still does this we can investigate further, maybe with the standalone SDL tests if not a small FNA test.

[Chicken-Bones]

Still present in:

SDL v3002025.SDL-3.2.25-5a9050a (Github Workflow)
FNA3D v25.10.0
FAudio v25.10.0

[kiddkaffeine]

Hey @Chicken-Bones, I just tried adding a button to do this toggle on an M4 running macOS 15, and I'm not sure I see this, either with the latest FNA+SDL or the version from a few months ago. Do you have a sample project that illustrates this?