"No area style for multipolygon" produces lots of duplicates

[skyper]

What steps will reproduce the problem?

1. Have a multipolygon with only access=*, area=*, lanes=*, layer=*, level=*, lit=*, name=* or ref=* (list probably incomplete)
2. Run Validator

What is the expected result?

One warning about missing tag describing the area and no informal warning: No area style for multipolygon

What happens instead?

• Multiple warnings on different warning levels, some I will address in #20902.
  • always but on different warning levels: Multipolygon tags - tag describing the area is missing from java TagChecker
  • always informal warning: No area style for multipolygon from java MultipolygonTest

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

The list of tags is probably not complete and it is not restricted to only one additional tag besides type=multipolygon.
With only surface=* beside type, there exists even a higher mapcss warning, which makes both informal warnings from both java test useless duplicates.
These two java test need to be synced to only produce one warning.

Relative:URL: ^/trunk
Repository:UUID: 0c6e7542-c601-0410-84e7-c038aed88b3b
Last:Changed Date: 2021-05-17 21:27:21 +0200 (Mon, 17 May 2021)
Revision:17903
Build-Date:2021-05-18 01:31:02
URL:https://josm.openstreetmap.de/svn/trunk