From what I can tell time-stamps are supposed to be monotonic
however with LIBDECOR & GNOME click events after resizing the window
can cause this to happen.
Resolve by only considering the value wrapped when the new time-stamps
wrapped difference is less than the unwrapped difference.
Also skip wrapping when the current offset is closer to the current time
than it would be with the offset applied.
a56d0c700c