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Created attachment 4682 [details]
Disable the normal window hack and correct cursor position.

Hi,

Until now I was "hacking" the normal, non-FULLSCREEN window creation so any window would fill the whole screen area while keeping it's aspect ratio.
That's just plain wrong as it breaks the API and compromises future multiple display support.

Included patch disables the "hack", so:

-normal windows look like windows, filling the corresponding area of the screen.
-FULLSCREEN windows cause a display mode change if necessary.
-FULLSCREEN_DESKTOP windows will use the "desktop resolution" as expected.

Also, not forcing normal windows to fill the screen height, the DRM cursor coordinates need to be converted, because DRM cursor Y coordinates start at the top of the screen. This patch also does that, and accesses the cursor through it's focus window, since that's the correct way in SDL design.

Please review and I will push, thanks!