preserve filesize on rename after upload

lib/private/files/storage/wrapper/encryption.php

@@ -181,6 +181,9 @@ class Encryption extends Wrapper {
 		$result = $this->storage->rename($path1, $path2);
 		if ($result) {
 			$target = $this->getFullPath($path2);
+			if (isset($this->unencryptedSize[$source])) {
+				$this->unencryptedSize[$target] = $this->unencryptedSize[$source];
+			}
 			$encryptionModule = $this->getEncryptionModule($path2);
 			if ($encryptionModule) {
 				$keyStorage = $this->getKeyStorage($encryptionModule->getId());