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
Before this change, if a file shrunk in size on the remote then rclone could get into an loop trying to download the file forever. The symptom was repeating errors like this: vfs cache: restart download failed: failed to start downloader: failed to open downloader: vfs reader: failed to open source file: invalid seek position The fix was to check that file size in various places and makes sure that we weren't trying to download too much data. This was a problems with backends (like s3) which update the size of the object on Open to the actual size of the object.