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In working on #13857, I noticed that the current regex based implementation of textwrap.dedent() is limited specifically to ASCII whitespace (tabs and spaces) with Unix line endings (a line containing solely a Windows "\r\n" line ending will be deemed to contain a non-whitespace character, since "\r" isn't recognised by the regex)
The new textwrap.indent() function added in #13857 takes a much simpler approach to whitespace handling: its definition of a "line" is exactly that of "text.splitlines(True)", while its definition of a line that does not consist solely of whitespace is "bool(line.strip())"
As a simple example of how that can make a difference, consider:
>>> "\N{NO-BREAK SPACE}".strip()
''
One way to remedy this would be to replace the regex based implementation of textwrap.dedent with a simpler one written in terms of text.splitlines(True) and line.strip().