code: def indentation_post_event_input_accelerators(editor, event):
      
  
      if event.key() in (Qt.Key_Enter, Qt.Key_Return):
          cursor = editor.textCursor()
          block = cursor.block().previous()
          if block.isValid():
              indent = match = re.match(r"(\s*)", foundations.strings.to_string(block.text())).group(1)
              cursor.insertText(indent)
  
              indentation_symbols = get_editor_capability(editor, "indentation_symbols")
              if not indentation_symbols:
                  return True
  
              if not block.text():
                  return True
  
              if not foundations.strings.to_string(block.text())[-1] in indentation_symbols:
                  return True
  
              symbols_pairs = get_editor_capability(editor, "symbols_pairs")
              if not symbols_pairs:
                  return True
  
              cursor.insertText(editor.indent_marker)
  
              position = cursor.position()
              cursor.movePosition(QTextCursor.PreviousBlock, QTextCursor.MoveAnchor)
              cursor.movePosition(QTextCursor.EndOfLine, QTextCursor.MoveAnchor)
              cursor.movePosition(QTextCursor.PreviousCharacter, QTextCursor.KeepAnchor)
              previous_character = foundations.strings.to_string(cursor.selectedText())
              cursor.setPosition(position)
              next_character = editor.get_next_character()
              if previous_character in symbols_pairs:
                  if next_character in symbols_pairs.values():
                      cursor.insertBlock()
                      cursor.insertText(match)
                      cursor.movePosition(QTextCursor.PreviousBlock, QTextCursor.MoveAnchor)
                      cursor.movePosition(QTextCursor.EndOfLine, QTextCursor.MoveAnchor)
                      editor.setTextCursor(cursor)
      return True
docs: Implements indentation post event input accelerators.
  
      :param editor: Document editor.
      :type editor: QWidget
      :param event: Event being handled.
      :type event: QEvent
      :return: Method success.
      :rtype: bool