@Override
              public Comparable<ExtensionSortKey> getTypeSortKey() {
                PsiFile value = getValue();
                Language language = value == null ? null : value.getLanguage();
                LanguageFileType fileType = language == null ? null : language.getAssociatedFileType();
                return fileType == null ? null : new ExtensionSortKey(fileType.getDefaultExtension());
              }
@Override
              public Comparable<ExtensionSortKey> getTypeSortKey()