As described in https://github.com/danirod/cartero/issues/67, by default if a long line has no spaces, a Gtk TextView cannot find a break point for the word wrapping. The solution is to use WordChar, which uses characters as a fallback if a line has no spaces and it cannot physically break by word.
As described in https://github.com/danirod/cartero/issues/67, by default if a long line has no spaces, a Gtk TextView cannot find a break point for the word wrapping. The solution is to use WordChar, which uses characters as a fallback if a line has no spaces and it cannot physically break by word.