def _split_lines(self, text, width):
        """Wrap lines after splitting on original newlines.

        This allows to have explicit line breaks in the help text.
        """
        import textwrap

        lines = []
        for line in text.splitlines():
            lines.extend(textwrap.wrap(line.strip(), width))
        return lines
Wrap lines after splitting on original newlines.

        This allows to have explicit line breaks in the help text.
        
src/_pytest/config/argparsing.py