unnecessary.mapcss suggests removing area=yes from railway=platform for indoor features

[rskedgell]

While area=yes may be unnecessary for most indoor objects, the wiki explicitly requires it for railway=platform - ​https://wiki.openstreetmap.org/wiki/Tag:railway%3Dplatform

Changing line #24 of unnecessary.mapcss from
way:closed[indoor ][area?][!highway][indoor!=no]
to
way:closed[indoor ][area?][!highway][indoor!=no][railway!=platform]
would fix this, but there are probably other cases where area=yes should be preserved.

[taylor.smock]

From the original ​proposal:

Platforms can also be mapped as areas, for better rendering results a closed way should also be tagged as
area=yes
for platforms used in bus stations or by non rail services

I'm strongly disinclined to special case a tag combination that was specifically created for rendering purposes; a closed polygon should be more than enough of a hint that the platform is drawn as an area.

[skyper]

Well indoor is kind of special as it is the lonesome line which does not include a primary key. While I think area=* is not needed for railway=platform I wonder why we flag railway=platform only in combination with indoor.

There are not many tags which can be both, an area or a linear object, mapped as a closed way but leisure=track is one of them and at least [leisure!=track] is missing.