textwidth, except that it inserts EOL characters, and that breaks what I consider to be a sentence. I'd like to go back to having a long sentence be a long sentence, but I want it visually broken.
wrapmargin also inserts EOLs and seems to just go from the right side of the screen, not the left, so that's out.
linebreak sounds like what I want, but, it seems like it allows you to fill the screen and then defines what character to break at; this is not what I want. Rather, I want to break at some definitive point like I can with textwidth (e.g. character 80) but without the EOL.
Does the option I want exist?