id	summary	reporter	owner	description	type	status	priority	milestone	component	version	resolution	keywords	cc
20911	Validator incorrectly reports overlapping buildings for building and building:part that share nodes	jpear1	team	"==== What steps will reproduce the problem?
1. Download attached `reproduce.osm`
2. Launch JOSM and open `reproduce.osm`
3. Run the validator

==== What is the expected result?
No warnings

==== What happens instead?
One warning: Overlapping buildings

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

I encountered this warning editing the UCSB Library, located at about 34.4135, -119.8455. I removed a lot of the junk around it to make it easier to look at.

This warning seems to come and go. If you copy all of the data in `reproduce.osm` and paste it into a new layer, the warning goes away. Sometimes I could simplify the shape more and still get this validator warning, but it would disappear once I saved the file, closed and repoened JOSM, reopened the file, and re-ran  the validator.


{{{
Relative:URL: ^/trunk
Repository:UUID: 0c6e7542-c601-0410-84e7-c038aed88b3b
Last:Changed Date: 2021-04-27 20:35:33 +0200 (Tue, 27 Apr 2021)
Revision:17833
Build-Date:2021-04-27 21:58:39
URL:https://josm.openstreetmap.de/svn/trunk

Identification: JOSM/1.5 (17833 en) Linux Arch Linux
Memory Usage: 169 MB / 1922 MB (76 MB allocated, but free)
Java version: 15.0.2+7, N/A, OpenJDK 64-Bit Server VM
Look and Feel: javax.swing.plaf.metal.MetalLookAndFeel
Screen: :0.0 1920×1080 (scaling 1.00×1.00) :0.1 1920×1080 (scaling 1.00×1.00)
Maximum Screen Size: 1920×1080
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: UTF-8
Locale info: en_US
Numbers with default locale: 1234567890 -> 1234567890
Desktop environment: KDE
VM arguments: [-Djosm.restart=true]
Dataset consistency test: No problems found

Plugins:
+ apache-commons (35524)
+ conflation (0.6.6)
+ ejml (35458)
+ geotools (35458)
+ imagery_offset_db (35640)
+ jaxb (35543)
+ jts (35458)
+ opendata (35640)
+ turnrestrictions (35640)
+ utilsplugin2 (35691)
}}}
"	defect	closed	normal		Core validator		duplicate	template_report overlapping buildings