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On Wayland -- or at least on some Wayland implementations -- windows aren't shown until something has been rendered into them. For the 'checkkeys' test program, this means that keyboard input isn't registered, making the program rather useless. By creating a renderer and presenting once, the window is properly displayed, and the test behaves as it does under X11 (including XWayland). The exact same thing was done with testmessge in 1cd97e2695 (PR #4252)
Simple DirectMedia Layer (SDL) Version 2.0
Simple DirectMedia Layer is a cross-platform development library designed to provide low level access to audio, keyboard, mouse, joystick, and graphics hardware via OpenGL and Direct3D. It is used by video playback software, emulators, and popular games including Valve's award winning catalog and many Humble Bundle games.
More extensive documentation is available in the docs directory, starting with README.md
Enjoy!
Sam Lantinga (slouken@libsdl.org)
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