transfer ownership of shared files deletes the share

[individual-it]

core tests that transfer ownership of a shared file fail. e.g:

  Scenario: transferring ownership of file shares
    Given user "user0" has been created
    And user "user1" has been created
    And user "user2" has been created
    And user "user0" has uploaded file "data/textfile.txt" to "/somefile.txt"
    And user "user0" has shared file "/somefile.txt" with user "user2" with permissions 19
    When the administrator transfers ownership from "user0" to "user1" using the occ command
    Then the command should have been successful
    And the downloaded content when downloading file "/somefile.txt" for user "user2" with range "bytes=0-6" should be "This is"

doing this manually on S3 does give:

Analysing files of user0 ...
    2 [============================]
Collecting all share information for files and folder of user0 ...
    1 [============================]
Transferring files to user1/files/transferred from user0 on 20181113_080521 ...
Restoring shares ...
Share with id 51 points at deleted file, skipping
 1/1 [============================] 100%

git bisec points to this commit owncloud/core@0c87fb5

[ownclouders]

GitMate.io thinks the contributors most likely able to help are @ownclouders, and @davitol.

Possibly related issues are #89 (Lost share when transferring files to recipient), and #53 (Restoring a previous version of a shared file fails).

[individual-it]

other tests that fail after the same commit:

    /drone/server/tests/acceptance/features/apiMain/transfer-ownership.feature:41
    /drone/server/tests/acceptance/features/apiMain/transfer-ownership.feature:52
    /drone/server/tests/acceptance/features/apiMain/transfer-ownership.feature:77
    /drone/server/tests/acceptance/features/apiMain/transfer-ownership.feature:170
    /drone/server/tests/acceptance/features/apiMain/transfer-ownership.feature:182
    /drone/server/tests/acceptance/features/apiMain/transfer-ownership.feature:196
    /drone/server/tests/acceptance/features/apiMain/transfer-ownership.feature:221
    /drone/server/tests/acceptance/features/apiFavorites/favorites.feature:102
    /drone/server/tests/acceptance/features/apiFavorites/favorites.feature:103
    /drone/server/tests/acceptance/features/apiShareManagement/updateShare.feature:277
    /drone/server/tests/acceptance/features/apiShareOperations/downloadFromShare.feature:18
    /drone/server/tests/acceptance/features/apiWebdavProperties/moveFile.feature:162
    /drone/server/tests/acceptance/features/apiWebdavProperties/moveFile.feature:163