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Some backends, such as Wayland, don't support explicit mouse capture, and thus don't implement the backend function to do so, but do set/unset the capture flag on button events to handle cases where a button is pressed and the pointer is dragged outside the window. If the backend doesn't support explicitly setting the mouse capture mode, manually clear the capture flag when the window has had the focus forcibly removed, to avoid sending bogus motion events as well as an assert condition.
Simple DirectMedia Layer (SDL) Version 3.0
Simple DirectMedia Layer is a cross-platform development library designed to provide low level access to audio, keyboard, mouse, joystick, and graphics hardware. 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. If you are migrating to SDL 3.0 from SDL 2.0, the changes are extensively documented in README-migration.md.
Enjoy!
Sam Lantinga (slouken@libsdl.org)