Reporter: fernando.trebien[at]gmail.com
[Submitted to the original trac issue database at 3.02pm, Saturday, 20th April 2013]

I've now had to talk to several Potlatch users who deleted or altered map features because they couldn't understand that thin black lines could be part of multipolygons. For example, this is a beach and it is correctly represented in both JOSM and Mapnik's default style:
http://www.openstreetmap.org/browse/relation/2884813

Same thing with this park's perimeter:
http://www.openstreetmap.org/browse/relation/2745520

Most problems I've had so far were district boundaries getting deleted because the user thought they were not roads. I minimized this effect by adding "boundary" tags, which are not required in neither JOSM nor Mapnik and also not according to the multipolygon logic described in the wiki. I did it solely to work around Potlatch's display logic. Beaches are nodes or areas but never ways, so there are no workarounds for this case, as with many others.

Maybe the users were not so smart, but I think Potlatch, being used mostly by casual users and newcomers, should avoid misguiding users.