OpenGL + windowed mode on macOS renders the game in a tiny corner of the window

[fimmtiu]

With a freshly compiled latest-master build of OpenXcom on a macOS Catalina laptop, I see the following behaviour when I run the program in a window in OpenGL mode:

No matter how large I make the window, it will only use the bottom left quarter of it. OpenGL + fullscreen mode works correctly. Software rendering also works correctly in both windowed and fullscreen mode, but is unusably slow.

There's nothing particularly noteworthy in the logs:

[13-03-2021_22-30-26]   [INFO]  SDL initialized successfully.
[13-03-2021_22-30-26]   [INFO]  SDL_mixer initialized successfully.
[13-03-2021_22-30-26]   [INFO]  requested file not found: openxcom.png
[13-03-2021_22-30-26]   [INFO]  Detected locale: nl_NL.UTF-8
[13-03-2021_22-30-26]   [INFO]  Attempting to set display to 1280x800x32...
[13-03-2021_22-30-27]   [INFO]  Display set to 1280x800x32.

[fimmtiu]

Looks like this is a known issue with OS X Catalina, and was remedied in the SDL 1.2 master branch four days ago: libsdl-org/SDL-1.2@89fc1b1