It draws a single line between the preview window and the rest of the interface. i.e. automatically choose between 'left', 'right', 'top', and 'bottom' depending on the position of the preview window.
It draws a single line between the preview window and the rest of the interface. i.e. automatically choose between 'left', 'right', 'top', and 'bottom' depending on the position of the preview window.