layer=* needs to be taken into account for overlapping areas.

[skyper]

What steps will reproduce the problem?

Have two overlapping areas. One is a building=roof plus layer=1 the other one a public_transport=platform + railway=platform without layer=0.

What is the expected result?

No informal warning

What happens instead?

I get two informal warning about Overlapping Areas.

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

The tag layer=* should be sufficient.

URL:http://josm.openstreetmap.de/svn/trunk
Repository:UUID: 0c6e7542-c601-0410-84e7-c038aed88b3b
Last:Changed Date: 2016-12-17 22:13:42 +0100 (Sat, 17 Dec 2016)
Build-Date:2016-12-19 02:34:30
Revision:11407
Relative:URL: ^/trunk

Identification: JOSM/1.5 (11407 en) Linux Debian GNU/Linux 8.6 (jessie)
Memory Usage: 580 MB / 882 MB (66 MB allocated, but free)
Java version: 1.8.0_111-8u111-b14-2~bpo8+1-b14, Oracle Corporation, OpenJDK 64-Bit Server VM
Java package: openjdk-8-jre:amd64-8u111-b14-2~bpo8+1
Java ATK Wrapper package: libatk-wrapper-java:all-0.30.4-3
Program arguments: [--language=en]
Dataset consistency test: No problems found

Plugins:
+ utilsplugin2 (33088)

Validator rules:
+ https://josm.openstreetmap.de/josmfile?page=Rules/GermanySpecific&zip=1

Last errors/warnings:
- W: Invalid jar file ''<josm.userdata>/plugins/utilsplugin2.jar.new'' (exists: false, canRead: false)

[Don-vip]

Defined in geometry.mapcss:

area:closed:areaStyle ⧉ area:closed:areaStyle {
  throwOther: tr("Overlapping Areas");
}

[Don-vip]

In 12986/josm:

fix #14132 - MapCSS crossing operator must check layer attribute first