id	summary	reporter	owner	description	type	status	priority	milestone	component	version	resolution	keywords	cc
17183	Validator doesn't show errors when panel is not open	GerdP	GerdP	"==== What steps will reproduce the problem?
1. Start JOSM
2. Crtl+N for new Edit Layer
3. If Validator Panel  is opened, close it and the data layer and open a new data layer
4. Draw a way without adding any tags and run Validator 

==== What is the expected result?
Validator panel should open and show a warning for an untagged way
==== What happens instead?
Validator panel opens but shows no erros.
==== Please provide any additional information below. Attach a screenshot if possible.
Executing the validator again shows the expected result. Same problem happens when data is downloaded.
The problem is that `ValidatorTreePanel.buildTree()` is called twice, once with the error list and again with an still empty error list retrieved from `MainApplication.getLayerManager().getEditLayer().validationErrors`
I did not find the best place to fix that.
{{{
URL:https://josm.openstreetmap.de/svn/trunk
Repository:UUID: 0c6e7542-c601-0410-84e7-c038aed88b3b
Last:Changed Date: 2018-12-31 15:09:58 +0100 (Mon, 31 Dec 2018)
Build-Date:2018-12-31 14:24:10
Revision:14620
Relative:URL: ^/trunk

Identification: JOSM/1.5 (14620 de) Windows 10 64-Bit
OS Build number: Windows 10 Home 1803 (17134)
Memory Usage: 553 MB / 1820 MB (364 MB allocated, but free)
Java version: 1.8.0_191-b12, Oracle Corporation, Java HotSpot(TM) 64-Bit Server VM
Screen: \Display0 1920x1080
Maximum Screen Size: 1920x1080

Plugins:
+ OpeningHoursEditor (34535)
+ apache-commons (34506)
+ buildings_tools (34807)
+ download_along (34503)
+ ejml (34389)
+ geotools (34513)
+ jaxb (34506)
+ jts (34524)
+ o5m (34405)
+ opendata (34805)
+ pbf (34576)
+ poly (34546)
+ reltoolbox (34788)
+ reverter (34552)
+ utilsplugin2 (34793)

Last errors/warnings:
- W: No configuration settings found.  Using hardcoded default values for all pools.
- W: Region [TMS_BLOCK_v2] Resetting cache
- W: Cannot start IPv4 remotecontrol https server on port 8112: Keystore was tampered with, or password was incorrect
- W: Cannot start IPv6 remotecontrol https server on port 8112: Keystore was tampered with, or password was incorrect
}}}
"	defect	closed	normal	19.01	Core validator		fixed	template_report