id	summary	reporter	owner	description	type	status	priority	milestone	component	version	resolution	keywords	cc
20384	Flag changed way segments going outside of the download area	GerdP	team	"==== What steps will reproduce the problem?
1. Downlad an area that contains a small part of a landuse=residential"" area which is crossed by a building
2. Move a node of the residential area so that the building is inside the area
3. Upload

==== What is the expected result?
A warning if the moved node changes a segment which ends outside of the download area, as this might produce more overlapping buildings in the area that was not downloaded. 

==== What happens instead?
No such warning
==== Please provide any additional information below. Attach a screenshot if possible.
This is just an example because it happened to me recently. The same problem can happen when a 
highway segment is moved.
I know this is difficult because we don't store the change of geometries so far. No idea if the validator is the right place to warn about this. Maybe it would be better to warn directly after the node move was done.
{{{
Revision:17458
Is-Local-Build:true
Build-Date:2021-01-13 16:03:15

Identification: JOSM/1.5 (17458 SVN en) Windows 10 64-Bit
OS Build number: Windows 10 Home 2004 (19041)
Memory Usage: 229 MB / 1972 MB (45 MB allocated, but free)
Java version: 15.0.1+9, AdoptOpenJDK, OpenJDK 64-Bit Server VM
Look and Feel: com.sun.java.swing.plaf.windows.WindowsLookAndFeel
Screen: \Display0 1920×1080 (scaling 1,00×1,00)
Maximum Screen Size: 1920×1080
Best cursor sizes: 16×16→32×32, 32×32→32×32
Dataset consistency test: No problems found

Plugins:
+ ColumbusCSV (35640)
+ OpeningHoursEditor (35640)
+ apache-commons (35524)
+ buildings_tools (35669)
+ ejml (35458)
+ geotools (35458)
+ jaxb (35543)
+ jts (35458)
+ o5m (35640)
+ opendata (35640)
+ pbf (35650)
+ poly (35640)
+ reverter (35640)
+ undelete (35640)
+ utilsplugin2 (35682)

Validator rules:
+ c:\josm\core\resources\data\validator\combinations.mapcss
+ c:\josm\core\resources\data\validator\geometry.mapcss

Last errors/warnings:
- 00000,528 W: extended font config - overriding 'filename.Myanmar_Text=mmrtext.ttf' with 'MMRTEXT.TTF'
- 00000,531 W: extended font config - overriding 'filename.Mongolian_Baiti=monbaiti.ttf' with 'MONBAITI.TTF'
}}}
"	enhancement	new	normal		Core validator			template_report