IllegalStateException deleting some nodes

[skyper]

What steps will reproduce the problem?

1. revert a changeset
2. add a node to a new layer outside of download area of 1.
3. merge layers on "new layer"
4. try to delete node id:0 outside download area

What is the expected result?

It should be always possible to delete nodes with id=0

What happens instead?

IllegalStateException

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

Can test a bit more later but problem seems to be the download area.

Repository Root: http://josm.openstreetmap.de/svn
Build-Date: 2013-03-04 02:31:43
Last Changed Author: akks
Revision: 5756
Repository UUID: 0c6e7542-c601-0410-84e7-c038aed88b3b
URL: http://josm.openstreetmap.de/svn/trunk
Last Changed Date: 2013-03-03 21:20:18 +0100 (Sun, 03 Mar 2013)
Last Changed Rev: 5756

Identification: JOSM/1.5 (5756 de)
Memory Usage: 103 MB / 643 MB (49 MB allocated, but free)
Java version: 1.6.0_27, Sun Microsystems Inc., OpenJDK 64-Bit Server VM
Operating system: Linux
Dataset consistency test: No problems found

Plugin: mirrored_download (29210)
Plugin: reverter (29296)
Plugin: utilsplugin2 (29241)
Plugin: wikipedia (29330)

java.lang.IllegalStateException: Ein Objekt mit ID=0 darf nicht unsichtbar sein.
	at org.openstreetmap.josm.data.osm.AbstractPrimitive.setVisible(AbstractPrimitive.java:396)
	at org.openstreetmap.josm.data.osm.OsmPrimitive.saveCommonAttributes(OsmPrimitive.java:1161)
	at org.openstreetmap.josm.data.osm.Node.save(Node.java:251)
	at org.openstreetmap.josm.data.osm.Node.save(Node.java:16)
	at org.openstreetmap.josm.command.DeleteCommand.executeCommand(DeleteCommand.java:120)
	at org.openstreetmap.josm.command.SequenceCommand.executeCommand(SequenceCommand.java:54)
	at org.openstreetmap.josm.data.UndoRedoHandler.addNoRedraw(UndoRedoHandler.java:36)
	at org.openstreetmap.josm.data.UndoRedoHandler.add(UndoRedoHandler.java:58)
	at org.openstreetmap.josm.actions.mapmode.DeleteAction.doActionPerformed(DeleteAction.java:152)
	at org.openstreetmap.josm.actions.DeleteAction.actionPerformed(DeleteAction.java:28)
	at javax.swing.SwingUtilities.notifyAction(SwingUtilities.java:1660)
	at javax.swing.JComponent.processKeyBinding(JComponent.java:2851)
	at javax.swing.KeyboardManager.fireBinding(KeyboardManager.java:285)
	at javax.swing.KeyboardManager.fireKeyboardAction(KeyboardManager.java:247)
	at javax.swing.JComponent.processKeyBindingsForAllComponents(JComponent.java:2928)
	at javax.swing.JComponent.processKeyBindings(JComponent.java:2920)
	at javax.swing.JComponent.processKeyEvent(JComponent.java:2814)
	at java.awt.Component.processEvent(Component.java:6065)
	at java.awt.Container.processEvent(Container.java:2045)
	at java.awt.Component.dispatchEventImpl(Component.java:4649)
	at java.awt.Container.dispatchEventImpl(Container.java:2103)
	at java.awt.Component.dispatchEvent(Component.java:4475)
	at java.awt.KeyboardFocusManager.redispatchEvent(KeyboardFocusManager.java:1879)
	at java.awt.DefaultKeyboardFocusManager.dispatchKeyEvent(DefaultKeyboardFocusManager.java:770)
	at java.awt.DefaultKeyboardFocusManager.preDispatchKeyEvent(DefaultKeyboardFocusManager.java:1046)
	at java.awt.DefaultKeyboardFocusManager.typeAheadAssertions(DefaultKeyboardFocusManager.java:913)
	at java.awt.DefaultKeyboardFocusManager.dispatchEvent(DefaultKeyboardFocusManager.java:735)
	at java.awt.Component.dispatchEventImpl(Component.java:4519)
	at java.awt.Container.dispatchEventImpl(Container.java:2103)
	at java.awt.Window.dispatchEventImpl(Window.java:2587)
	at java.awt.Component.dispatchEvent(Component.java:4475)
	at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:675)
	at java.awt.EventQueue.access$300(EventQueue.java:96)
	at java.awt.EventQueue$2.run(EventQueue.java:634)
	at java.awt.EventQueue$2.run(EventQueue.java:632)
	at java.security.AccessController.doPrivileged(Native Method)
	at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:105)
	at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:116)
	at java.awt.EventQueue$3.run(EventQueue.java:648)
	at java.awt.EventQueue$3.run(EventQueue.java:646)
	at java.security.AccessController.doPrivileged(Native Method)
	at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:105)
	at java.awt.EventQueue.dispatchEvent(EventQueue.java:645)
	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:13