With positive argument, switch to 132-column mode.
With negative argument, switch to 80-column mode."
(interactive "P")
- (setq vt100-wide-mode
+ (setq vt100-wide-mode
(if (null arg) (not vt100-wide-mode)
(> (prefix-numeric-value arg) 0)))
(send-string-to-terminal (if vt100-wide-mode "\e[?3h" "\e[?3l"))