code: def get_tab_text(self, index, is_modified=None, is_readonly=None):
          
          files_path_list = [finfo.filename for finfo in self.data]
          fname = self.data[index].filename
          fname = sourcecode.disambiguate_fname(files_path_list, fname)
          return self.__modified_readonly_title(fname,
                                                is_modified, is_readonly)
docs: Return tab title.