tunneled highway should have no effects in min_height buildings

[Matthias84]

If there is a building part where people can walk below, I usually use tunnel=yes, to indicate that the sky is invisible here (e.g. cause GPS to get no position).

Unfortunatly, O2W seems to interpretate tunnel=yes as a tunnel one level below and so create a tunnel that is one level down, even if this tunnel way is covered by a building/buildingpart that has min_height attribute to indicate that there is space to walk along and no need of a tunnel.

Example: Please see http://www.openstreetmap.org/?lat=54.077592&lon=12.11513&zoom=18 (part is labeled "Säulengang" and stays with pillars in the air).