Exclusive fullscreen mode not possible anymore

[fladd]

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In Pygame 1, fullscreen OpenGL windows used to be in "exclusive" fullscreen mode. In Pygame 2 they are by default "desktop" fullscreen mode. This is in principle no big problem, however, there is currently no way to make the "exclusive" anymore, due to the code here: https://github.com/pygame-community/pygame-ce/blob/2.2.0/src_c/display.c#L952/

Exclusive fullscreen mode is important, since (at least under Windows) they it seems to be the only way to bypass the compositor.

For more information about why this is important, please see here: https://github.com/pygame/pygame/issues/3619#issuecomment-1428772707