@Override
 public void documentChanged(DocumentEvent e) {
   UndoManager undoManager = UndoManager.getInstance(myProject);
   boolean undoOrRedo = undoManager.isUndoInProgress() || undoManager.isRedoInProgress();
   if (undoOrRedo) {
     // allow undo/redo up until 'creation stamp' back in time
     // and check it after action is completed
     if (e.getDocument() == myOrigDocument) {
       //noinspection SSBasedInspection
       SwingUtilities.invokeLater(
           () -> {
             if (myOrigCreationStamp > myOrigDocument.getModificationStamp()) {
               closeEditor();
             }
           });
     }
   } else if (e.getDocument() == myNewDocument) {
     commitToOriginal(e);
     if (!isValid()) {
       ApplicationManager.getApplication()
           .invokeLater(() -> closeEditor(), myProject.getDisposed());
     }
   } else if (e.getDocument() == myOrigDocument) {
     if (myCommittingToOriginal || myAltFullRange != null && myAltFullRange.isValid()) return;
     ApplicationManager.getApplication().invokeLater(() -> closeEditor(), myProject.getDisposed());
   }
 }
 @Override
 protected void moveOffsetAfter(boolean success) {
   if (getLocalVariable() != null && getLocalVariable().isValid()) {
     myEditor.getCaretModel().moveToOffset(getLocalVariable().getTextOffset());
     myEditor.getScrollingModel().scrollToCaret(ScrollType.MAKE_VISIBLE);
   } else if (getExprMarker() != null) {
     final RangeMarker exprMarker = getExprMarker();
     if (exprMarker.isValid()) {
       myEditor.getCaretModel().moveToOffset(exprMarker.getStartOffset());
       myEditor.getScrollingModel().scrollToCaret(ScrollType.MAKE_VISIBLE);
     }
   }
   super.moveOffsetAfter(success);
   if (myLocalMarker != null && !isRestart()) {
     myLocalMarker.dispose();
   }
   if (success) {
     performPostIntroduceTasks();
     final String refactoringId = getRefactoringId();
     if (refactoringId != null) {
       final RefactoringEventData afterData = new RefactoringEventData();
       afterData.addElement(getVariable());
       myProject
           .getMessageBus()
           .syncPublisher(RefactoringEventListener.REFACTORING_EVENT_TOPIC)
           .refactoringDone(refactoringId, afterData);
     }
   }
 }
 public boolean isValid() {
   boolean valid =
       myNewVirtualFile.isValid()
           && (myAltFullRange == null && myInjectedFile.isValid()
               || myAltFullRange != null && myAltFullRange.isValid());
   if (valid) {
     for (Trinity<RangeMarker, RangeMarker, SmartPsiElementPointer> t : myMarkers) {
       if (!t.first.isValid() || !t.second.isValid() || t.third.getElement() == null) {
         valid = false;
         break;
       }
     }
   }
   return valid;
 }
  public boolean startsOnTheSameElement(E expr, V localVariable) {
    if (myExprMarker != null
        && myExprMarker.isValid()
        && expr != null
        && myExprMarker.getStartOffset() == expr.getTextOffset()) {
      return true;
    }

    if (myLocalMarker != null
        && myLocalMarker.isValid()
        && localVariable != null
        && myLocalMarker.getStartOffset() == localVariable.getTextOffset()) {
      return true;
    }
    return isRestart();
  }