java.lang.IllegalStateException: Already locked
   at org.netbeans.modules.editor.indent.IndentImpl.reformatLock(IndentImpl.java:183)
   at org.netbeans.modules.editor.indent.api.Reformat.lock(Reformat.java:114)
   at org.netbeans.modules.gsf.api.EditList.apply(EditList.java:144)
   at org.netbeans.modules.python.editor.imports.ImportManager.apply(ImportManager.java:580)
   at org.netbeans.modules.python.editor.imports.ImportManager.cleanup(ImportManager.java:183)
   at org.netbeans.modules.python.editor.PythonFormatter.reformat(PythonFormatter.java:119)
   at org.netbeans.modules.python.editor.PythonFormatter.reformat(PythonFormatter.java:110)
   at org.netbeans.modules.gsf.GsfReformatTask.reformat(GsfReformatTask.java:104)
   at org.netbeans.modules.editor.indent.TaskHandler$MimeItem.runTask(TaskHandler.java:548)
   at org.netbeans.modules.editor.indent.TaskHandler.runTasks(TaskHandler.java:316)
   at org.netbeans.modules.editor.indent.IndentImpl.reformat(IndentImpl.java:325)
   at org.netbeans.modules.editor.indent.api.Reformat.reformat(Reformat.java:154)
   at org.netbeans.editor.ActionFactory$FormatAction$1$1.run(ActionFactory.java:1694)
   at org.netbeans.editor.GuardedDocument.runAtomicAsUser(GuardedDocument.java:344)
   at org.netbeans.editor.ActionFactory$FormatAction$1.run(ActionFactory.java:1661)
   at org.netbeans.modules.progress.ui.RunOffEDTImpl$1.run(RunOffEDTImpl.java:160)
   at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:1418)
   at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:1960)
Caused: org.openide.util.RequestProcessor$SlowItem: task failed due to: java.lang.IllegalStateException: Already locked
   at org.openide.util.RequestProcessor.post(RequestProcessor.java:421)
   at org.netbeans.modules.progress.ui.RunOffEDTImpl.runOffEventDispatchThreadImpl(RunOffEDTImpl.java:153)
   at org.netbeans.modules.progress.ui.RunOffEDTImpl.runOffEventDispatchThread(RunOffEDTImpl.java:115)
   at org.netbeans.api.progress.ProgressUtils.runOffEventDispatchThread(ProgressUtils.java:89)
   at org.netbeans.editor.ActionFactory$FormatAction.actionPerformed(ActionFactory.java:1654)
   at org.netbeans.editor.BaseAction.actionPerformed(BaseAction.java:339)
   at org.openide.awt.AlwaysEnabledAction$1.run(AlwaysEnabledAction.java:137)
   at org.openide.util.actions.ActionInvoker$1.run(ActionInvoker.java:95)
   at org.openide.util.actions.ActionInvoker.doPerformAction(ActionInvoker.java:116)
   at org.openide.util.actions.ActionInvoker.invokeAction(ActionInvoker.java:99)
   at org.openide.awt.AlwaysEnabledAction.actionPerformed(AlwaysEnabledAction.java:140)
   at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:1995)
   at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2318)
   at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:387)
   at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:242)
   at javax.swing.AbstractButton.doClick(AbstractButton.java:357)
   at javax.swing.plaf.basic.BasicMenuItemUI.doClick(BasicMenuItemUI.java:809)
   at javax.swing.plaf.basic.BasicMenuItemUI$Handler.mouseReleased(BasicMenuItemUI.java:850)
   at java.awt.Component.processMouseEvent(Component.java:6267)
   at javax.swing.JComponent.processMouseEvent(JComponent.java:3267)
   at java.awt.Component.processEvent(Component.java:6032)
   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:4577)
   at java.awt.LightweightDispatcher.processMouseEvent(LightweightDispatcher.java:4238)
   at java.awt.LightweightDispatcher.dispatchEvent(LightweightDispatcher.java:4168)
   at java.awt.Container.dispatchEventImpl(Container.java:2085)
   at java.awt.Window.dispatchEventImpl(Window.java:2478)
   at java.awt.Component.dispatchEvent(Component.java:4460)
   at java.awt.EventQueue.dispatchEvent(EventQueue.java:599)
   at org.netbeans.core.TimableEventQueue.dispatchEvent(TimableEventQueue.java:138)
   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)