Fixes the bug by updating the method of recording the amount of time the system has been awake.

During the processing of a continuous drag event, other mouse move events may be in the queue waiting to be processed.

But when a mouse wrapping happens, these waiting mouse move events become out of date as they report a mouse position prior to wrapping.

The current code ignores these events by comparing their timestamp to the time recorded in the last mouse wrapping.

The bug happens because the computed value in mach_absolute_time() * 1e-9 for some reason is incompatible with the value of [event timestamp].

Since macOS 10.6, we have a new way to get the amount of time the system has been awake. [[NSProcessInfo processInfo] systemUptime]

Using this method of recording time the bug was finally fixed.