deleted-on-server attribute is lost when saving to a file

[Adrian]

What steps will reproduce the problem?

1. Undelete node 427688517 into a new layer.
2. Display Advanced info for the node and see the attribute deleted-on-server.
3. Save the layer to a file and delete the layer.
4. Open the file you have just saved.
5. Display Advanced info for the node.

What is the expected result?

The node still has the attribute deleted-on-server.

What happens instead?

The node does not have the attribute deleted-on-server. This is because visible='false' is missing from the file.

Please provide any additional information below. Attach a screenshot if possible.

URL:https://josm.openstreetmap.de/svn/trunk
Repository:UUID: 0c6e7542-c601-0410-84e7-c038aed88b3b
Last:Changed Date: 2018-07-29 00:41:59 +0200 (Sun, 29 Jul 2018)
Build-Date:2018-07-29 01:32:17
Revision:14066
Relative:URL: ^/trunk

Identification: JOSM/1.5 (14066 en_GB) Mac OS X 10.12.6
OS Build number: Mac OS X 10.12.6 (16G1510)
Memory Usage: 622 MB / 3641 MB (164 MB allocated, but free)
Java version: 1.8.0_172-b11, Oracle Corporation, Java HotSpot(TM) 64-Bit Server VM
Screen: Display 725375437 1920x1200
Maximum Screen Size: 1920x1200
Dataset consistency test: No problems found

Plugins:
+ ImportImagePlugin (34389)
+ InfoMode (34206)
+ PicLayer (34389)
+ apache-commons (34389)
+ cadastre-fr (34389)
+ download_along (34389)
+ editgpx (34206)
+ ejml (34389)
+ geotools (34125)
+ imagery_offset_db (34370)
+ jts (34206)
+ log4j (34038)
+ measurement (34206)
+ opendata (34389)
+ poly (34389)
+ reverter (34271)
+ turnrestrictions (34129)
+ undelete (34274)
+ utilsplugin2 (34389)
+ waydownloader (34313)

Last errors/warnings:
- W: No configuration settings found.  Using hardcoded default values for all pools.

[Don-vip]

Probable regression from r12019

[Don-vip]

In 14169/josm:

fix #16575 - make sure download/upload policies are never null and set to normal by default