Sometimes xcolor does not respond to mouse clicks

[infmagic2047]

If I left-click while moving the mouse (especially when moving fast), sometimes xcolor does not catch the left-click, and instead keep running as if there were no clicks.

My preliminary debugging shows that, in wait_for_location function, there are indeed no left-click event received when this happens. Maybe the event is somehow lost when there are too many events (the mouse moving) to handle.