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XInput2 keyboard handling has limitations: system keys that shouldn't be passed through when the keyboard isn't grabbed can be seen, and the text input system needs key events to flow through the X server to function properly (passing synthesized events through the filter function is not sufficient and doesn't work with non-Latin character sets). The primary bit of information missing from the core X key events that XInput2 provides is the source device, so use the XInput2 slave keyboard device events to store that value, and apply it to core X key events with the same serial. XInput2 events always arrive before core events so this works universally.
Simple DirectMedia Layer (SDL for short) is a cross-platform library designed to make it easy to write multi-media software, such as games and emulators.
You can find the latest release and additional information at: https://www.libsdl.org/
Installation instructions and a quick introduction is available in INSTALL.md
This library is distributed under the terms of the zlib license, available in LICENSE.txt.
Enjoy!
Sam Lantinga (slouken@libsdl.org)