Number of characters from the right window border where wrapping starts. When typing text beyond this limit, an will be inserted and inserting continues on the next line. Options that add a margin, such as 'number' and 'foldcolumn', cause the text width to be further reduced. This is Vi compatible. When 'textwidth' is non-zero, this option is not used. This option is set to 0 when 'paste' is set and restored when 'paste' is reset. See also 'formatoptions' and |ins-textwidth|.