Jeff Smith authored Jul 20, 2018 and Marco Trevisan committed Aug 13, 2018

meta_backend_x11_grab_device is performing X server clock comparison
using the MAX macro, which comes down to a simple greater-than.

Use XSERVER_TIME_IS_BEFORE, which is a better macro for X server
clock comparisons, as it accounts for 32-bit wrap-around.

!174