java.lang.Throwable
   at org.netbeans.modules.editor.fold.FoldChildren.insertImpl(FoldChildren.java:247)
   at org.netbeans.modules.editor.fold.FoldChildren.insertImpl(FoldChildren.java:227)
   at org.netbeans.modules.editor.fold.FoldChildren.replaceByChildren(FoldChildren.java:215)
   at org.netbeans.api.editor.fold.Fold.replaceByChildren(Fold.java:377)
   at org.netbeans.api.editor.fold.FoldHierarchy$ApiPackageAccessorImpl.foldReplaceByChildren(FoldHierarchy.java:398)
   at org.netbeans.modules.editor.fold.FoldHierarchyTransactionImpl.removeFoldFromHierarchy(FoldHierarchyTransactionImpl.java:1004)
   at org.netbeans.modules.editor.fold.FoldHierarchyTransactionImpl.removeFold(FoldHierarchyTransactionImpl.java:476)
   at org.netbeans.modules.editor.fold.FoldHierarchyExecution.remove(FoldHierarchyExecution.java:498)
   at org.netbeans.modules.editor.fold.FoldHierarchyTransactionImpl.removeCheckDamaged2(FoldHierarchyTransactionImpl.java:428)
   at org.netbeans.modules.editor.fold.FoldHierarchyTransactionImpl.removeUpdate(FoldHierarchyTransactionImpl.java:399)
   at org.netbeans.modules.editor.fold.FoldHierarchyExecution.removeUpdate(FoldHierarchyExecution.java:993)
   at org.netbeans.lib.editor.util.swing.PriorityDocumentListenerList.removeUpdate(PriorityDocumentListenerList.java:116)
   at javax.swing.text.AbstractDocument.fireRemoveUpdate(AbstractDocument.java:260)
   at org.netbeans.editor.BaseDocument.fireRemoveUpdate(BaseDocument.java:1627)
   at org.netbeans.editor.BaseDocument.handleRemove(BaseDocument.java:1021)
   at org.netbeans.editor.BaseDocument$FilterBypassImpl.replace(BaseDocument.java:2501)
   at javax.swing.text.DocumentFilter.replace(DocumentFilter.java:120)
   at org.openide.text.CloneableEditorSupport$DocFilter.replace(CloneableEditorSupport.java:2352)
   at org.netbeans.editor.BaseDocument.replace(BaseDocument.java:1042)
   at org.netbeans.modules.versioning.ui.diff.DiffSidebar.onRollback(DiffSidebar.java:338)
   at org.netbeans.modules.versioning.ui.diff.DiffTooltipActionsPanel.actionPerformed(DiffTooltipActionsPanel.java:136)
   at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:2018)
   at javax.swing.AbstractButton$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.focusLost(BasicButtonListener.java:198)
   at java.awt.AWTEventMulticaster.focusLost(AWTEventMulticaster.java:229)
   at java.awt.Component.processFocusEvent(Component.java:6397)
   at java.awt.Component.processEvent(Component.java:6261)
   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.KeyboardFocusManager.redispatchEvent(KeyboardFocusManager.java:1895)
   at java.awt.DefaultKeyboardFocusManager.typeAheadAssertions(DefaultKeyboardFocusManager.java:947)
   at java.awt.DefaultKeyboardFocusManager.dispatchEvent(DefaultKeyboardFocusManager.java:621)
   at java.awt.Component.dispatchEventImpl(Component.java:4731)
   at java.awt.Container.dispatchEventImpl(Container.java:2287)
   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(AccessController.java:0)
   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(AccessController.java:0)
   at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76)
   at java.awt.EventQueue.dispatchEvent(EventQueue.java:705)
   at org.netbeans.core.TimableEventQueue.dispatchEvent(TimableEventQueue.java:159)
   at java.awt.SentEvent.dispatch(SentEvent.java:70)
   at java.awt.DefaultKeyboardFocusManager$DefaultKeyboardFocusManagerSentEvent.dispatch(DefaultKeyboardFocusManager.java:216)
   at java.awt.DefaultKeyboardFocusManager.sendMessage(DefaultKeyboardFocusManager.java:243)
   at java.awt.DefaultKeyboardFocusManager.dispatchEvent(DefaultKeyboardFocusManager.java:687)
   at java.awt.Component.dispatchEventImpl(Component.java:4731)
   at java.awt.Container.dispatchEventImpl(Container.java:2287)
   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(AccessController.java:0)
   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(AccessController.java:0)
   at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76)
   at java.awt.EventQueue.dispatchEvent(EventQueue.java:705)
   at org.netbeans.core.TimableEventQueue.dispatchEvent(TimableEventQueue.java:159)
   at java.awt.SequencedEvent.dispatch(SequencedEvent.java:128)
   at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:733)
   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(AccessController.java:0)
   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(AccessController.java:0)
   at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76)
   at java.awt.EventQueue.dispatchEvent(EventQueue.java:705)
   at org.netbeans.core.TimableEventQueue.dispatchEvent(TimableEventQueue.java:159)
   at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:242)
   at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:161)
   at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:150)
   at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:146)
   at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:138)
   at java.awt.EventDispatchThread.run(EventDispatchThread.java:91)