Before this change, moving (renaming) a file or folder to a different name
within the same parent directory would fail, due to using the wrong API
operation ("/file/move_copy.json" and "/folder/move_copy.json", instead of the
separate "/file/rename.json" and "/folder/rename.json" that opendrive has for
this purpose.)
After this change, Move and DirMove check whether the move is within the same
parent dir. If so, "rename" is used. If not, "move_copy" is used, like before.
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