[X11] fix cursor jumping when grabbed #834
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Description
i found that cursor jumps randomly when you move your cursor only when you grabbed
it occurs because you set
last_xandlast_ywhile anotherMotionNotifyevent is in the queue, possibly an event beforeXWarpPointerappliedthis patch make sure there is no
MotionNotifyevent in the queue before settinglast_xandlast_y, warping cursor and sending mouse move