add landcover=mostly_rock to ignored [PATCH]

[mkoniecz]

re https://josm.openstreetmap.de/ticket/24898#comment:5

Regarding new tags, yet to silence the JOSM-Integration-Test is a never ending task.

heh, I have own detector - ignores at ​https://github.com/matkoniecz/taginfo_api_wrapper_in_python/blob/master/tests.py#L64 with ​https://github.com/openstreetmap/id-tagging-schema/issues/2605 listing what seems missing in iD presets

I would also ignore

• building = agricultural - probably building=farm_auxiliary duplicate, but not clear what it means
• fence_type=wood / metal - see ​https://wiki.openstreetmap.org/wiki/Key:fence_type and ​https://community.openstreetmap.org/t/tagging-that-fence-is-wooden-without-further-detail-fence-type-wood-vs-material-wood/135748

but these may want to get some hint? Though it is probably better to first retag obvious cases of fence_type=wood / metal with bot edit before bothering human editors

[mkoniecz]

initially I thought that I would include more, sorry for so trivial patch. Hopefully it is not annoying to process given the patch process?