No warning about strange relation with triplicated outer way

[naoliv]

Open the attached example file and validate. Nothing is displayed.
But open the relation and note how we have the same way 3 times as outer, together with JOSM saying that the multipolygon is closed:

I see two problems:

• JOSM should issue a warning for cases like this (I guess it will happens when the number is odd (ie, the same way is inserted 3, 5, 7, etc times); maybe even offer to repair it
• JOSM should not display the multipolygon as closed

JOSM

URL:http://josm.openstreetmap.de/svn/trunk
Repository:UUID: 0c6e7542-c601-0410-84e7-c038aed88b3b
Last:Changed Date: 2016-06-06 23:43:32 +0200 (Mon, 06 Jun 2016)
Build-Date:2016-06-07 01:32:04
Revision:10331
Relative:URL: ^/trunk

Identification: JOSM/1.5 (10331 pt_BR) Linux Debian GNU/Linux testing (stretch)
Memory Usage: 979 MB / 10206 MB (350 MB allocated, but free)
Java version: 1.8.0_91-8u91-b14-2-b14, Oracle Corporation, OpenJDK 64-Bit Server VM
VM arguments: [-Dawt.useSystemAAFontSettings=on]
Dataset consistency test: No problems found

Plugins:
- Create_grid_of_ways (32158)
- DxfImport (1006)
- OpeningHoursEditor (32158)
- PicLayer (32158)
- RoadSigns (32177)
- SimplifyArea (32158)
- apache-commons (32158)
- buildings_tools (32158)
- conflation (0.2.0)
- contourmerge (1014)
- download_along (32158)
- editgpx (32158)
- ejml (32158)
- geotools (31895)
- imagery_offset_db (32158)
- importvec (32158)
- indoorhelper (32158)
- jts (31906)
- log4j (32158)
- measurement (32158)
- merge-overlap (32158)
- opendata (32158)
- pbf (32158)
- pdfimport (32158)
- poly (32158)
- reverter (32158)
- scripting (30722)
- todo (29154)
- turnrestrictions (32158)
- undelete (32158)
- utilsplugin2 (32158)

[GerdP]

Current version of JOSM shows error message "Multipolygon member(s) repeated with same role". Not sure when this was fixed, probably with r11157