docs: def indent(self):
          """
          Indents text at cursor position.
          """
          cursor = self.editor.textCursor()
          assert isinstance(cursor, QtGui.QTextCursor)
          if cursor.hasSelection():
              self.indent_selection(cursor)
          else:
              # simply insert indentation at the cursor position
              tab_len = self.editor.tab_length
              if cursor.positionInBlock() < self.min_column and not cursor.atBlockEnd():
                  cursor.movePosition(cursor.Right, cursor.MoveAnchor, self.min_column)
              cursor.beginEditBlock()
              if self.editor.use_spaces_instead_of_tabs:
                  nb_space_to_add = tab_len - (cursor.positionInBlock() - self.min_column) % tab_len
                  cursor.insertText(nb_space_to_add * " ")
              else:
                  cursor.insertText('\t')
              cursor.endEditBlock()
              self.editor.setTextCursor(cursor)