Just like regular “Preview”, but shows what is stored in copy/paste buffer for last 5-6 copy instances, adjustable in preferences like undo history.
When spending hours animating complex mech or filling landscapes with vegetation, select-copying similar parts becomes really tedious.
The instances can be pasted by dragging from clipboard. Instance #1 is pasted via Ctrl+V.
When I think about it again, it looks so very like tile editing…