Copy of FsIterator_set_sorted_pear does not retain position

[reckart]

Describe the bug
When an iterator of the type FsIterator_set_sorted_pear is copied, the copy is always set to the start of the iterator (i.e. position is 0).

Expected behavior
The copy should have the same position as the original.

Please complete the following information:

• Version: 3.4.1