[OCIS-storage] Restoring an older version of a shared file deletes the share

[individual-it]

1. upload a file
2. upload it again to create a version
3. share the file
4. accept the share
5. as sharer restore the old version of the file
6. as receiver check your shares

current behaviour:

• the file is not listed in Shares
• a request to https://localhost:9200/ocs/v2.php/apps/files_sharing//api/v1/shares?format=json,json&shared_with_me=true&state=all&include_tags=false gives an invalid response:

{
	"ocs": {
		"meta": {
			"status": "ok",
			"statuscode": 200,
			"message": "OK"
		},
		"data": [
			{
				"id": "4947d90d-e561-49ad-851c-4cf1a43331e6",
				"share_type": 0,
				"uid_owner": "4c510ada-c86b-4815-8820-42cdf82c3d51",
				"displayname_owner": "Albert Einstein",
				"permissions": 1,
				"stime": 1603881327,
				"parent": "",
				"expiration": "",
				"token": "",
				"uid_file_owner": "4c510ada-c86b-4815-8820-42cdf82c3d51",
				"displayname_file_owner": "Albert Einstein",
				"additional_info_owner": "",
				"additional_info_file_owner": "",
				"state": 0,
				"path": "",
				"item_type": "",
				"mimetype": "",
				"storage_id": "",
				"storage": 0,
				"item_source": "",
				"file_source": "",
				"file_parent": "",
				"file_target": "",
				"share_with": "932b4540-8d16-481e-8ef4-588e4b6b151c",
				"share_with_displayname": "Richard Feynman",
				"share_with_additional_info": "",
				"mail_send": 0,
				"name": ""
			}
		]
	}
}

[refs]

confirm it happens in the current master

[individual-it]

• ToDo QA-team: add API tests for this case (if not existing yet)