Added in 2.7
/linemarker [-rsN] [window] |on|off]
Changes unread line marker settings for a window.
If no window is defined, current window is used.
Switches
-r - Reset unread marker line position on [window].
-sN - If N = 0, enables the small unread line marker, if N = 1, disables the small unread line marker.
Parameters
[window] - Window to edit.
[on|off] - Enables or disables unread line marker for all windows, unless [Window] is defined.