do not render closed ways with piste:type=* as areas and allow unclosed pistes

[skyper]

Please do not render closed ways with piste:type=* as areas as long as there is no area=yes set.

Validator complains about a piste:type=downhill as a unclosed way.

Have a look at the example.

r4317

[skyper]

example

[simon04]

The warning is due to sport=skiing, which is not allowed on unclosed ways (cf. ​https://wiki.openstreetmap.org/wiki/Tag:sport=skiing). When this tag is removed, no warning is shown. Therefore I consider this ticket as invalid.

[Nzara]

According to ​https://wiki.openstreetmap.org/wiki/Key:sport sport=skiing is allowed on unclosed ways.
The preset Sports/sport/skiing creates sport=skiing. The tag seems to be required.
On the ground observations shows, skiing is performed in the very most cases on a linear piste.

[Klumbumbus]

In 10896/josm:

fix #6708 - Pistes can be drawn as area or linear. If linear they can be closed or not. So draw area style only if area=yes is tagged and oneway arrows only if area=yes is not tagged.