X11 Polling Issues

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I've built the most recent version (0.66.1) for Linux, and when I play there are weird diagonal lines on the timing graph. It looks like the input is only being polled every 16.6 ms (the same as my display refresh rate).

According to this guide, these changes are needed to have the polling rate not be limited by the framerate for X11 input.
(It looks like these changes preserve the event timestamps when passing the keyboard events to the game.)