code: def highlight_block(self, text):
          
          text = to_text_string(text)
          if text.startswith("+++"):
              self.setFormat(0, len(text), self.formats["keyword"])
          elif text.startswith("---"):
              self.setFormat(0, len(text), self.formats["keyword"])
          elif text.startswith("+"):
              self.setFormat(0, len(text), self.formats["string"])
          elif text.startswith("-"):
              self.setFormat(0, len(text), self.formats["number"])
          elif text.startswith("@"):
              self.setFormat(0, len(text), self.formats["builtin"])
          
          self.highlight_spaces(text)
docs: Implement highlight specific Diff/Patch files.