https://forums.freebsd.org/tags/textwidth/
textwidth | The FreeBSD Forums
freebsdforums
https://groups.google.com/g/vim_use/c/ePYOoqKAdck
What sets textwidth=78
sets
https://chromewebstore.google.com/detail/textwidth-converter/clenhohoikbnldhfohokognnhjpdbdcj?hl=en-US
TextWidth Converter - Chrome Web Store
TextWidth Converter quickly converts highlighted text between half-width and full-width characters with a single click.
converterchromewebstore