Pressing Q breaks josm

[me@…]

What steps will reproduce the problem?

1. Pressed Q on a building
2. Got an exception

What is the expected result?

No exception.

What happens instead?

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

URL:http://josm.openstreetmap.de/svn/trunk
Repository:UUID: 0c6e7542-c601-0410-84e7-c038aed88b3b
Last:Changed Date: 2016-03-18 01:15:07 +0100 (Fri, 18 Mar 2016)
Build-Date:2016-03-18 02:34:53
Revision:10010
Relative:URL: ^/trunk

Identification: JOSM/1.5 (10010 be) Linux Ubuntu Xenial Xerus (development branch)
Memory Usage: 999 MB / 999 MB (641 MB allocated, but free)
Java version: 1.8.0_74-b02, Oracle Corporation, Java HotSpot(TM) 64-Bit Server VM
VM arguments: [-Djava.net.preferIPv4Stack=true]
Dataset consistency test: No problems found

Plugins:
- FastDraw (31895)
- Mapillary (32040)
- OpeningHoursEditor (31772)
- apache-commons (31895)
- apache-http (31895)
- buildings_tools (31895)
- imagery_offset_db (32046)
- reverter (32005)

Last errors/warnings:
- E: java.util.ConcurrentModificationException: java.util.ConcurrentModificationException: java.util.ConcurrentModificationException. Прычына: java.util.ConcurrentModificationException: java.util.ConcurrentModificationException. Прычына: java.util.ConcurrentModificationException

java.util.ConcurrentModificationException: java.util.ConcurrentModificationException: java.util.ConcurrentModificationException
	at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
	at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
	at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
	at java.lang.reflect.Constructor.newInstance(Constructor.java:423)
	at java.util.concurrent.ForkJoinTask.getThrowableException(ForkJoinTask.java:593)
	at java.util.concurrent.ForkJoinTask.reportException(ForkJoinTask.java:677)
	at java.util.concurrent.ForkJoinTask.join(ForkJoinTask.java:720)
	at java.util.concurrent.ForkJoinPool.invoke(ForkJoinPool.java:2616)
	at org.openstreetmap.josm.data.osm.visitor.paint.StyledMapRenderer.render(StyledMapRenderer.java:1930)
	at org.openstreetmap.josm.gui.layer.OsmDataLayer.paint(OsmDataLayer.java:401)
	at org.openstreetmap.josm.gui.MapView.paintLayer(MapView.java:630)
	at org.openstreetmap.josm.gui.MapView.paint(MapView.java:690)
	at javax.swing.JComponent.paintChildren(JComponent.java:889)
	at javax.swing.JComponent.paint(JComponent.java:1065)
	at javax.swing.JComponent.paintToOffscreen(JComponent.java:5210)
	at javax.swing.BufferStrategyPaintManager.paint(BufferStrategyPaintManager.java:290)
	at javax.swing.RepaintManager.paint(RepaintManager.java:1272)
	at javax.swing.JComponent._paintImmediately(JComponent.java:5158)
	at javax.swing.JComponent.paintImmediately(JComponent.java:4969)
	at javax.swing.RepaintManager$4.run(RepaintManager.java:831)
	at javax.swing.RepaintManager$4.run(RepaintManager.java:814)
	at java.security.AccessController.doPrivileged(Native Method)
	at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:76)
	at javax.swing.RepaintManager.paintDirtyRegions(RepaintManager.java:814)
	at javax.swing.RepaintManager.paintDirtyRegions(RepaintManager.java:789)
	at javax.swing.RepaintManager.prePaintDirtyRegions(RepaintManager.java:738)
	at javax.swing.RepaintManager.access$1200(RepaintManager.java:64)
	at javax.swing.RepaintManager$ProcessingRunnable.run(RepaintManager.java:1732)
	at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:311)
	at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:756)
	at java.awt.EventQueue.access$500(EventQueue.java:97)
	at java.awt.EventQueue$3.run(EventQueue.java:709)
	at java.awt.EventQueue$3.run(EventQueue.java:703)
	at java.security.AccessController.doPrivileged(Native Method)
	at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:76)
	at java.awt.EventQueue.dispatchEvent(EventQueue.java:726)
	at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:201)
	at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:116)
	at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:105)
	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101)
	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:93)
	at java.awt.EventDispatchThread.run(EventDispatchThread.java:82)
Caused by: java.util.ConcurrentModificationException: java.util.ConcurrentModificationException
	at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
	at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
	at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
	at java.lang.reflect.Constructor.newInstance(Constructor.java:423)
	at java.util.concurrent.ForkJoinTask.getThrowableException(ForkJoinTask.java:593)
	at java.util.concurrent.ForkJoinTask.reportException(ForkJoinTask.java:677)
	at java.util.concurrent.ForkJoinTask.join(ForkJoinTask.java:720)
	at org.openstreetmap.josm.data.osm.visitor.paint.StyledMapRenderer$ComputeStyleListWorker.compute(StyledMapRenderer.java:1829)
	at org.openstreetmap.josm.data.osm.visitor.paint.StyledMapRenderer$ComputeStyleListWorker.compute(StyledMapRenderer.java:1793)
	at java.util.concurrent.RecursiveTask.exec(RecursiveTask.java:94)
	at java.util.concurrent.ForkJoinTask.doExec(ForkJoinTask.java:289)
	at java.util.concurrent.ForkJoinPool$WorkQueue.runTask(ForkJoinPool.java:1056)
	at java.util.concurrent.ForkJoinPool.runWorker(ForkJoinPool.java:1692)
	at java.util.concurrent.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:157)
Caused by: java.util.ConcurrentModificationException
	at java.util.ArrayList$Itr.checkForComodification(ArrayList.java:901)
	at java.util.ArrayList$Itr.next(ArrayList.java:851)
	at java.util.AbstractList.equals(AbstractList.java:522)
	at java.util.Objects.equals(Objects.java:59)
	at org.openstreetmap.josm.gui.mappaint.DividedScale.equals(DividedScale.java:182)
	at java.util.Arrays.deepEquals0(Arrays.java:4299)
...<snip>...

[Don-vip]

Closed as duplicate of #12598.