Complain about area:highway on open ways and nodes

[mkoniecz]

What steps will reproduce the problem?

1. Create node and tag it with area:highway=footway
2. Create open way and tag it with area:highway=footway
3. Run validator

What is the expected result?

Validator complain about area:highway=* that is not on areas.

What happens instead?

No complaints.

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

​https://wiki.openstreetmap.org/wiki/Key:area:highway

URL:https://josm.openstreetmap.de/svn/trunk
Repository:UUID: 0c6e7542-c601-0410-84e7-c038aed88b3b
Last:Changed Date: 2018-12-17 22:42:01 +0100 (Mon, 17 Dec 2018)
Build-Date:2018-12-18 02:32:19
Revision:14575
Relative:URL: ^/trunk

Identification: JOSM/1.5 (14575 en) Linux Ubuntu 16.04.5 LTS
Memory Usage: 435 MB / 869 MB (192 MB allocated, but free)
Java version: 1.8.0_191-b12, Oracle Corporation, Java HotSpot(TM) 64-Bit Server VM
Screen: :0.0 1920x1080
Maximum Screen Size: 1920x1080
Dataset consistency test: No problems found

Plugins:
+ OpeningHoursEditor (34535)
+ buildings_tools (34724)
+ continuosDownload (82)
+ imagery_offset_db (34641)
+ measurement (34529)
+ reverter (34552)
+ todo (30306)

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