When a server-side copy or move finished without reporting progress
along the way, its bytes were added to the stats but not to the
transfer, so until the transfer ended core/stats reported totalBytes as
the bytes done plus the whole size of the transfer still in progress.
A 1 GiB server-side copy on the local backend showed 1 GiB of 2 GiB
while rclone checked the hashes.
The bytes now go on the transfer as well, as they already did for
backends which report progress through NewServerSideCopyAccounter.
ilya lavrenov
b44c24cfca