ruler-mode-mouse-grab-any-column
ruler-mode-mouse-grab-any-column is an interactive compiled Lisp function in `ruler-mode.el'.
(ruler-mode-mouse-grab-any-column START-EVENT)
Drag a column symbol on the ruler.
Start dragging on mouse down event START-EVENT, and update the column
symbol value with the current value of the ruler graduation while
dragging.  See also the variable `ruler-mode-dragged-symbol'.