filter doesn't work as expected on multipolygon relations

[brogo]

The ways (without tags) of a mulupolygon-relation are still displayed, even if the filter fits for the MP.

[bastiK]

Ticket #6061 has been marked as a duplicate of this ticket.

[bastiK]

A multipolygon describes an area and as far as I can tell, the filter indeed suppresses the area painting.

It is not a priory clear to me, that the ways should be hidden as well, and there are cases where this would be wrong:

• way is used by another multipolygon
• way has tags and describes a feature on its own, e.g. a fence

It is clearly an issue that the untagged way gets its color from the multipolygon area and this color is still used, when the multipolygon is filtered.

In case of adjacent multipolygon the problem is not that easy to fix: Either we keep a list of "fallback colors" in the style cache, or the style cache needs to be regenerated whenever the filter flags of an object change.

[skyper]

I would suggest to use a better filter like: landuse child landuse

[bastiK]

In 5442/josm:

filter: improved multipolygon handling (fixes #5149, see #6160)

[bastiK]

It hides the member ways (and their nodes) now, in case they are untagged.

For ways with two parent multipolygons, the color may be wrong (unchanged) when one of the multipolygons is filtered, but the other is not.