docs: def highlight_multiline_block(self, block, start_pattern, end_pattern, state, format):
          """
          Highlights given multiline text block.
  
          :param block: Text block.
          :type block: QString
          :param pattern: Start regex pattern.
          :type pattern: QRegExp
          :param pattern: End regex pattern.
          :type pattern: QRegExp
          :param format: Format.
          :type format: QTextCharFormat
          :param state: Block state.
          :type state: int
          :return: Current block matching state.
          :rtype: bool
          """
  
          if self.previousBlockState() == state:
              start = 0
              extend = 0
          else:
              start = start_pattern.indexIn(block)
              extend = start_pattern.matchedLength()
  
          while start >= 0:
              end = end_pattern.indexIn(block, start + extend)
              if end >= extend:
                  length = end - start + extend + end_pattern.matchedLength()
                  self.setCurrentBlockState(0)
              else:
                  self.setCurrentBlockState(state)
                  length = block.length() - start + extend
              self.setFormat(start, length, format)
              start = start_pattern.indexIn(block, start + length)
  
          if self.currentBlockState() == state:
              return True
          else:
              return False