private void commitChanges(XmlFile xmlFile) {
    sortItems(xmlFile);
    PsiDocumentManager documentManager = PsiDocumentManager.getInstance(myPsiManager.getProject());
    Document doc = documentManager.getDocument(xmlFile);
    assert doc != null;
    documentManager.doPostponedOperationsAndUnblockDocument(doc);
    FileDocumentManager.getInstance().saveDocument(doc);
  }
private void commitChanges(XmlFile xmlFile)