id	summary	reporter	owner	description	type	status	priority	milestone	component	version	resolution	keywords	cc
20272	"Confusing handling of native scale layer and ""zoom to download"""	GerdP	team	"==== What steps will reproduce the problem?
1. Load some data from OSM server
2. Zoom out
3. Press 5 to ""zoom to download"", note that a small part of the dashed area is still visible
4. Add Bing layer (or another one with a ""native scale""), make sure that the ""scale follows native resolution ..."" checkbox is enabled, note that the dashed area disappeared because JOSM zoomed in a little bit.
5. Remove Bing layer, note that this doesn't change the map view
6. Press 5 again to zoom to download area. Note that now a large dashed area is visible, means, this zoom simply doesn't work anymore. Edit: This is also the case when the layer is not removed.

==== What is the expected result?
- Not sure if the small ""zooom in"" in step 4 is intended? 
- The layer removal should restore the old behaviour befor that layer was added. So, either enable a previous layer that was used for native scaling or none.
==== What happens instead?
- ""zoom to download"" no longer works until I add another layer with ""native scale"" and disable the ""scale follows native resolution ..."" checkbox 
==== Please provide any additional information below. Attach a screenshot if possible.
Found this while looking for memory leaks. The field `NavigatableComponent.nativeScaleLayer` is not modified when the Bing layer is removed.
{{{
Build-Date:2020-12-17 10:49:38
Revision:17408
Is-Local-Build:true

Identification: JOSM/1.5 (17408 SVN en) Windows 10 64-Bit
OS Build number: Windows 10 Home 2004 (19041)
Memory Usage: 791 MB / 1820 MB (671 MB allocated, but free)
Java version: 1.8.0_272-b10, 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
VM arguments: [-agentlib:jdwp=transport=dt_socket,suspend=y,address=localhost:57460, -ea, -javaagent:D:\eclipse-java-2020-09\eclipse\configuration\org.eclipse.osgi\215\0\.cp\lib\javaagent-shaded.jar, -Dfile.encoding=UTF-8]

Plugins:
+ ColumbusCSV (35640)
+ buildings_tools (35669)
+ o5m (35640)
+ pbf (35650)
+ poly (35640)
+ reverter (35640)
+ undelete (35640)
+ utilsplugin2 (35671)

Validator rules:
+ c:\josm\core\resources\data\validator\geometry.mapcss
}}}
"	defect	new	normal		Core			template_report	wiktorn simon04