Validator warns about "overlapping buildings" when a building overlaps a building:part

[tguen]

What steps will reproduce the problem?

1. download a building with an overlapping building:part
2. click the "validator" button in the validator results panel

What is the expected result?

Warning does not appear

What happens instead?

Warning for "overlapping buildings"

Please provide any additional information below. Attach a screenshot if possible.

tooltip for warning says:
Test: tag checker (MapCSS based)

Appears to be defined here:
resources/data/validator/geometry.mapcss:195

I can't think of any reason this would be appropriate. Anyone know why it was added?

Revision:19307
Is-Local-Build:true
Build-Date:2025-02-15 00:14:11

Identification: JOSM/1.5 (19307 SVN en) Linux Arch Linux
Memory Usage: 356 MB / 7960 MB (137 MB allocated, but free)
Java version: 21.0.6+7, Arch Linux, OpenJDK 64-Bit Server VM
Look and Feel: javax.swing.plaf.metal.MetalLookAndFeel
Screen: :0.0 3840x2160x[Multi depth]@120Hz (scaling 1.00×1.00)
Maximum Screen Size: 3840×2160
Best cursor sizes: 16×16→16×16, 32×32→32×32
Environment variable LANG: en_US.UTF-8
System property file.encoding: UTF-8
System property sun.jnu.encoding: ANSI_X3.4-1968
Locale info: en_US
Numbers with default locale: 1234567890 -> 1234567890
Desktop environment: KDE
VM arguments: [-Dawt.useSystemAAFontSettings=on, --add-exports=java.base/sun.security.action=ALL-UNNAMED, --add-exports=java.desktop/com.sun.imageio.plugins.jpeg=ALL-UNNAMED, --add-exports=java.desktop/com.sun.imageio.spi=ALL-UNNAMED]
Dataset consistency test: No problems found

Last errors/warnings:
- 00030.337 W: java.io.IOException: Attribution is not loaded yet
- 00030.337 W: java.io.IOException: Attribution is not loaded yet
- 00030.337 W: java.io.IOException: Attribution is not loaded yet
- 00030.337 W: java.io.IOException: Attribution is not loaded yet
- 00030.337 W: java.io.IOException: Attribution is not loaded yet
- 00030.338 W: java.io.IOException: Attribution is not loaded yet
- 00030.338 W: java.io.IOException: Attribution is not loaded yet
- 00030.338 W: java.io.IOException: Attribution is not loaded yet
- 00030.338 W: java.io.IOException: Attribution is not loaded yet
- 00030.338 W: java.io.IOException: Attribution is not loaded yet

[Antisida]

​https://wiki.openstreetmap.org/wiki/Key:building:part

Dont use building:part without building
It's not accepted, it seems

[skyper]

Yes in principle it is the rule that the object with building=* includes all building:part=* and therefore should not overlap. I have to admit that the concept can make it hard to get the footprint of the building at ground level. Additionally the wiki does not handle the situation in case of underground levels exceeding all other parts.