rangeGetMidpoint
Finds an iterator somewhere in the range (@begin, @end). This iterator will be close to the middle of the range, but is not guaranteed to be exactly in the middle.
The @begin and @end iterators must both point to the same sequence and @begin must come before or be equal to @end in the sequence.
Return
a #GSequenceIter pointing somewhere in the (@begin, @end) range
Since
2.14
Parameters
begin
a #GSequenceIter
end
a #GSequenceIter