code: def save(self):
          
          e = self.editor
  
          self._style = e.current_style
          self._show_line_numbers = e.show_line_numbers
          self._highlight_search = e.highlight_search
          self._show_ruler = e.show_ruler
          self._relative_number = e.relative_number
          self._cursorcolumn = e.cursorcolumn
          self._cursorline = e.cursorline
          self._colorcolumn = e.colorcolumn
docs: Back up current editor state.