The old `textwidth` value is meant to be subtracted from colorcolumn, to
then add the new one.
Fixes: 41656d28d6 ("vim:autocmd: Reset textwidth value in colorcolumn")
The old `textwidth` value is meant to be subtracted from colorcolumn, to
then add the new one.
Fixes: 41656d28d6 ("vim:autocmd: Reset textwidth value in colorcolumn")