Duplicating/moving items can change original order

[Syxton]

If item1, then item 2, then item 3, then item4 are created on a page, (in that order), then item4 is moved to the 3rd spot. So it would look like:

item1
item2
item4
item3

Then all the items are selected and duplicated to a section. You will see that they will be in the incorrect order. 1, 2, 3, and 4 instead of 1, 2, 4, 3 as they were when I selected them for duplication.

Fixed with pull request: #37