ConcurrentModificationException merging layers

[skyper]

Just happened. Not sure what really caused the exception and can not reproduce it right away.

What steps will reproduce the problem?

1. download some data
2. small edits (split way, add tags to several ways)
3. download overlapping bbox to new layer including at least one modified way
4. merge layers

What is the expected result?

successful merge keeping my edits

What happens instead?

ConcurrentModificationException

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

Repository Root: http://josm.openstreetmap.de/svn
Build-Date: 2012-07-15 01:31:12
Last Changed Author: bastiK
Revision: 5341
Repository UUID: 0c6e7542-c601-0410-84e7-c038aed88b3b
URL: http://josm.openstreetmap.de/svn/trunk
Last Changed Date: 2012-07-14 20:23:00 +0200 (Sat, 14 Jul 2012)
Last Changed Rev: 5341

Identification: JOSM/1.5 (5341 en_GB)
Memory Usage: 192 MB / 910 MB (39 MB allocated, but free)
Java version: 1.6.0_24, Sun Microsystems Inc., OpenJDK 64-Bit Server VM
Operating system: Linux
Dataset consistency test: No problems found

Plugin: PicLayer (27883)
Plugin: conflation (0.1.6)
Plugin: jts (28415)
Plugin: mirrored_download (28418)
Plugin: restart (28438)
Plugin: utilsplugin2 (28412)

java.util.ConcurrentModificationException
	at java.util.ArrayList$Itr.checkForComodification(ArrayList.java:782)
	at java.util.ArrayList$Itr.next(ArrayList.java:754)
	at java.util.Collections$UnmodifiableCollection$1.next(Collections.java:1026)
	at org.openstreetmap.josm.gui.dialogs.LayerListDialog$LayerNameCellRenderer.getTableCellRendererComponent(LayerListDialog.java:1007)
	at javax.swing.JTable.prepareRenderer(JTable.java:5736)
	at javax.swing.plaf.basic.BasicTableUI.paintCell(BasicTableUI.java:2108)
	at javax.swing.plaf.basic.BasicTableUI.paintCells(BasicTableUI.java:2010)
	at javax.swing.plaf.basic.BasicTableUI.paint(BasicTableUI.java:1806)
	at javax.swing.plaf.ComponentUI.update(ComponentUI.java:161)
	at javax.swing.JComponent.paintComponent(JComponent.java:765)
	at javax.swing.JComponent.paint(JComponent.java:1029)
	at javax.swing.JComponent.paintToOffscreen(JComponent.java:5138)
	at javax.swing.BufferStrategyPaintManager.paint(BufferStrategyPaintManager.java:302)
	at javax.swing.RepaintManager.paint(RepaintManager.java:1188)
	at javax.swing.JComponent._paintImmediately(JComponent.java:5086)
	at javax.swing.JComponent.paintImmediately(JComponent.java:4896)
	at javax.swing.RepaintManager.paintDirtyRegions(RepaintManager.java:783)
	at javax.swing.RepaintManager.paintDirtyRegions(RepaintManager.java:735)
	at javax.swing.RepaintManager.prePaintDirtyRegions(RepaintManager.java:677)
	at javax.swing.RepaintManager.access$700(RepaintManager.java:58)
	at javax.swing.RepaintManager$ProcessingRunnable.run(RepaintManager.java:1593)
	at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:226)
	at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:647)
	at java.awt.EventQueue.access$000(EventQueue.java:96)
	at java.awt.EventQueue$1.run(EventQueue.java:608)
	at java.awt.EventQueue$1.run(EventQueue.java:606)
	at java.security.AccessController.doPrivileged(Native Method)
	at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:105)
	at java.awt.EventQueue.dispatchEvent(EventQueue.java:617)
	at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:275)
	at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:200)
	at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:190)
	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:185)
	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:177)
	at java.awt.EventDispatchThread.run(EventDispatchThread.java:138)

[Don-vip]

In 5990/josm:

fix #7863 - ConcurrentModificationException while merging layers