Cannot download encrypted file version after moving to external storage

[PVince81]

Steps to reproduce

1. Enable encryption, external storage and files locking app
2. Log out then log in again
3. Mount a SFTP external storage to "/sftp"
4. Create a text file in the home root: "test.txt"
5. Edit the text file several times to create versions
6. Check the versions dropdown to have at least 3 versions
7. Check that an older version can be downloaded
8. Now move "test.txt" to "/sftp"
9. Check the versions dropdown
10. Download a version

Expected result

Versions can be downloaded, preview looks alright.

Actual result

Version file is still encrypted after download. The text preview thumbnail shows an encrypted content.
I haven't tried without the locking app, but suspect that it might happen without it too.

Versions

Happens on OC 8 master (f8b1fde)
and on OC 7 stable7 (80560e7)

Logs

Log (with the files_locking entries removed as it is too long)

{"reqId":"54c642d56a206","app":"PHP","message":"ob_end_clean(): failed to delete buffer. No buffer to delete at \/srv\/www\/htdocs\/owncloud\/lib\/private\/files\/view.php#269","level":0,"time":"2015-01-26T13:36:21+00:00","method":"GET","url":"\/owncloud\/index.php\/apps\/files_versions\/download.php?file=%2Fsftp%2Fv2.txt&revision=1422279013"}

@schiesbn

[davitol]

👍 fixed