java.beans.PropertyVetoException: Not allowed
        at org.openide.text.CloneableEditorSupport$Listener.vetoableChange(CloneableEditorSupport.java:2843)
        at org.netbeans.editor.BaseDocument.notifyModify(BaseDocument.java:1828)
Caused: javax.swing.text.BadLocationException: insertString() vetoed
        at org.netbeans.editor.BaseDocument.notifyModifyCheckStart(BaseDocument.java:987)
        at org.netbeans.editor.BaseDocument.insertString(BaseDocument.java:721)
        at org.netbeans.modules.diff.builtin.visualizer.editable.EditableDiffView.rollback(EditableDiffView.java:589)
        at org.netbeans.modules.diff.builtin.visualizer.editable.LineNumbersActionsBar.performAction(LineNumbersActionsBar.java:198)
        at org.netbeans.modules.diff.builtin.visualizer.editable.LineNumbersActionsBar.mouseClicked(LineNumbersActionsBar.java:205)
        at java.awt.AWTEventMulticaster.mouseClicked(AWTEventMulticaster.java:253)
        at java.awt.Component.processMouseEvent(Component.java:6266)
        at javax.swing.JComponent.processMouseEvent(JComponent.java:3267)
        at java.awt.Component.processEvent(Component.java:6028)
        at java.awt.Container.processEvent(Container.java:2041)
        at java.awt.Component.dispatchEventImpl(Component.java:4630)
        at java.awt.Container.dispatchEventImpl(Container.java:2099)
        at java.awt.Component.dispatchEvent(Component.java:4460)
        at java.awt.LightweightDispatcher.retargetMouseEvent(LightweightDispatcher.java:4574)
        at java.awt.LightweightDispatcher.processMouseEvent(LightweightDispatcher.java:4247)
        at java.awt.LightweightDispatcher.dispatchEvent(LightweightDispatcher.java:4168)
        at java.awt.Container.dispatchEventImpl(Container.java:2085)
        at java.awt.Window.dispatchEventImpl(Window.java:2475)
        at java.awt.Component.dispatchEvent(Component.java:4460)
        at java.awt.EventQueue.dispatchEvent(EventQueue.java:599)
        at org.netbeans.core.TimableEventQueue.dispatchEvent(TimableEventQueue.java:125)
        at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:269)
        at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:184)
        at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:174)
        at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:169)
        at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:161)
        at java.awt.EventDispatchThread.run(EventDispatchThread.java:122)