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XInput2 will grab the pointer on button presses, which causes the grab attempt to fail and ultimately timeout since the pointer is already grabbed, however, ungrabbing the pointer when no buttons are pressed and the pointer is outside the window can generate enter/leave notify events, which result in further calls of the grab function. The end result is an infinite loop of grab/ungrab attempts generating enter/leave events. This causes a hang in testautomation when creating a window with the grabbed flag if the pointer is not positioned within window bounds. Check the button state and only ungrab if a mouse button is in the pressed state.
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)