This is related to #19479 at least in the sense of addressing the same module, and being about   It has a patch, so it would be good to accept or reject. Martin, could you take a look?  There is currently no expert listed for textwrap.  Georg is current dormant as far as cpython is concerned.

To call the current behavior a bug, it should conflict with somethings in the docs.  Otherwise, it may be an enhancement proposal, in which case python-ideas would be a good place to discuss.  Julian, look in the docs to see if you find a conflict.