Before this change when the sync routine attempted to normalise a
case, say from "FiLe.txt" to "file.txt" this caused a 400 Bad Request
error:
> This copy request is illegal because it is trying to copy an object
> to itself without changing the object's metadata, storage class,
> website redirect location or encryption attributes.
This was caused by passing the same object as the source and
destination to the move routine, whereas the destination object had a
different case and didn't exist, so should have been passed as nil.
See: https://github.com/rclone/rclone/pull/7743#discussion_r1557345906
Nick Craig-Wood
f2e693f722