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This bug was originally marked as duplicate of bug 148168, that is already resolved. This bug is still valid, so this seems to be another bug, but it might be related. Build: NetBeans IDE 7.3 Beta 2 (Build nbms-and-javadoc-9948-on-20121227) VM: Java HotSpot(TM) 64-Bit Server VM, 23.6-b04, Java(TM) SE Runtime Environment, 1.7.0_10-b18 OS: Mac OS X User Comments: GUEST: Copy pasted some html into a phtml file. GUEST: working with extjs Stacktrace: java.lang.AssertionError: visnodes.size()=20 snapshot.size()=10 at org.openide.explorer.view.VisualizerChildren.recomputeIndexes(VisualizerChildren.java:98) at org.openide.explorer.view.VisualizerChildren.added(VisualizerChildren.java:242) at org.openide.explorer.view.VisualizerEvent$Added.run(VisualizerEvent.java:110) at org.openide.util.Mutex.readAccess(Mutex.java:367) at org.openide.util.Mutex$1R.run(Mutex.java:1309) at org.openide.nodes.Children$ProjectManagerDeadlockDetector.execute(Children.java:1921)
Created attachment 129988 [details] stacktrace
*** Bug 224448 has been marked as a duplicate of this bug. ***
All reports seem to be coming for CSL: http://statistics.netbeans.org/exceptions/messageslog?id=644658 http://statistics.netbeans.org/exceptions/messageslog?id=645695 http://statistics.netbeans.org/exceptions/messageslog?id=636856 Try to check your equals and hashCode implementation - they should be immutable.
*** This bug has been marked as a duplicate of bug 222381 ***