Undocking Wikipedia plugin results in: java.lang.IllegalArgumentException: Comparison method violates its general contract

[niki.guldbrand@…]

What steps will reproduce the problem?

1. load the wkipedea plugin (just a guess, as other plugins my be involved too)
2. try to undock it

What is the expected result?
That the undocked window for wikipedia appears

What happens instead?
This error

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

Repository Root: http://josm.openstreetmap.de/svn
Build-Date: 2013-07-10 01:34:22
Last Changed Author: stoecker
Revision: 6060
Repository UUID: 0c6e7542-c601-0410-84e7-c038aed88b3b
URL: http://josm.openstreetmap.de/svn/trunk
Last Changed Date: 2013-07-08 22:13:24 +0200 (Mon, 08 Jul 2013)
Last Changed Rev: 6060

Identification: JOSM/1.5 (6060 en) Linux Fedora 19 (Schrödinger’s Cat)
Memory Usage: 225 MB / 1680 MB (63 MB allocated, but free)
Java version: 1.7.0_25, Oracle Corporation, OpenJDK 64-Bit Server VM
VM arguments: [-Xbootclasspath/a:/usr/share/icedtea-web/netx.jar:/usr/share/java/js.jar, -Xms8m, -Dicedtea-web.bin.name=javaws, -Dicedtea-web.bin.location=/usr/bin/javaws.itweb]
Dataset consistency test: No problems found

Plugin: AddrInterpolation (29435)
Plugin: Create_grid_of_ways (29435)
Plugin: DirectDownload (29435)
Plugin: DirectUpload (29719)
Plugin: ElevationProfile (29611)
Plugin: FixAddresses (29661)
Plugin: HouseNumberTaggingTool (29487)
Plugin: ImportImagePlugin (29531)
Plugin: InfoMode (29435)
Plugin: OpeningHoursEditor (29435)
Plugin: PicLayer (29601)
Plugin: SeaMapEditor
Plugin: SimplifyArea (29435)
Plugin: alignways (29435)
Plugin: continuosDownload (28565)
Plugin: contourmerge (1005)
Plugin: dataimport (29435)
Plugin: download_along (29746)
Plugin: editgpx (29596)
Plugin: ext_tools (29435)
Plugin: geochat (29592)
Plugin: geotools (29435)
Plugin: gpsblam (29435)
Plugin: gpxfilter (29435)
Plugin: graphview (29525)
Plugin: imagery-xml-bounds (29710)
Plugin: imagery_offset_db (29467)
Plugin: imageryadjust (29609)
Plugin: importvec (29435)
Plugin: jts (29613)
Plugin: junctionchecking (29596)
Plugin: log4j (29435)
Plugin: mapdust (29525)
Plugin: measurement (29750)
Plugin: merge-overlap (29645)
Plugin: mirrored_download (29643)
Plugin: namemanager (29435)
Plugin: notes
Plugin: openstreetbugs (29435)
Plugin: openvisible (29435)
Plugin: osmarender (29639)
Plugin: pbf (29708)
Plugin: photo_geotagging (29435)
Plugin: poly (29711)
Plugin: print (29529)
Plugin: proj4j (29435)
Plugin: reltoolbox (29535)
Plugin: reverter (29663)
Plugin: routes (29435)
Plugin: routing (29633)
Plugin: scripting
Plugin: tageditor (29435)
Plugin: terracer (29623)
Plugin: todo (29155)
Plugin: turnlanes (29435)
Plugin: turnrestrictions (29435)
Plugin: undelete (29555)
Plugin: utilsplugin2 (29742)
Plugin: waydownloader (29435)
Plugin: waypoint_search (29435)
Plugin: wayselector (29435)
Plugin: wikipedia (29523)

java.lang.IllegalArgumentException: Comparison method violates its general contract!
	at java.util.TimSort.mergeLo(TimSort.java:747)
	at java.util.TimSort.mergeAt(TimSort.java:483)
	at java.util.TimSort.mergeCollapse(TimSort.java:410)
	at java.util.TimSort.sort(TimSort.java:214)
	at java.util.TimSort.sort(TimSort.java:173)
	at java.util.Arrays.sort(Arrays.java:659)
	at java.util.Collections.sort(Collections.java:217)
	at javax.swing.SortingFocusTraversalPolicy.enumerateAndSortCycle(SortingFocusTraversalPolicy.java:136)
	at javax.swing.SortingFocusTraversalPolicy.getFocusTraversalCycle(SortingFocusTraversalPolicy.java:110)
	at javax.swing.SortingFocusTraversalPolicy.getComponentAfter(SortingFocusTraversalPolicy.java:280)
	at javax.swing.LayoutFocusTraversalPolicy.getComponentAfter(LayoutFocusTraversalPolicy.java:106)
	at java.awt.Component.getNextFocusCandidate(Component.java:7860)
	at java.awt.Component.transferFocus(Component.java:7828)
	at java.awt.Component.hide(Component.java:1684)
	at java.awt.Component.show(Component.java:1653)
	at java.awt.Component.setVisible(Component.java:1603)
	at javax.swing.JComponent.setVisible(JComponent.java:2631)
	at org.openstreetmap.josm.gui.dialogs.ToggleDialog.detach(ToggleDialog.java:345)
	at org.openstreetmap.josm.gui.dialogs.ToggleDialog$TitleBar$4.actionPerformed(ToggleDialog.java:525)
	at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:2018)
	at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2341)
	at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:402)
	at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:259)
	at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:252)
	at java.awt.AWTEventMulticaster.mouseReleased(AWTEventMulticaster.java:289)
	at java.awt.Component.processMouseEvent(Component.java:6505)
	at javax.swing.JComponent.processMouseEvent(JComponent.java:3312)
	at java.awt.Component.processEvent(Component.java:6270)
	at java.awt.Container.processEvent(Container.java:2229)
	at java.awt.Component.dispatchEventImpl(Component.java:4861)
	at java.awt.Container.dispatchEventImpl(Container.java:2287)
	at java.awt.Component.dispatchEvent(Component.java:4687)
	at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4832)
	at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4492)
	at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4422)
	at java.awt.Container.dispatchEventImpl(Container.java:2273)
	at java.awt.Window.dispatchEventImpl(Window.java:2719)
	at java.awt.Component.dispatchEvent(Component.java:4687)
	at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:735)
	at java.awt.EventQueue.access$200(EventQueue.java:103)
	at java.awt.EventQueue$3.run(EventQueue.java:694)
	at java.awt.EventQueue$3.run(EventQueue.java:692)
	at java.security.AccessController.doPrivileged(Native Method)
	at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76)
	at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:87)
	at java.awt.EventQueue$4.run(EventQueue.java:708)
	at java.awt.EventQueue$4.run(EventQueue.java:706)
	at java.security.AccessController.doPrivileged(Native Method)
	at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76)
	at java.awt.EventQueue.dispatchEvent(EventQueue.java:705)
	at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:242)
...<snip>...