ruler-mode-ruler-help-echo-when-tab-stops

ruler-mode-ruler-help-echo-when-tab-stops is a variable defined in `ruler-mode.el'.
Its value is

"C-mouse1/3: set/unset tab, C-mouse-2: hide tabs"

• This variable may be risky if used as a file-local variable.

Documentation:
Help string shown when mouse is over the ruler.
`ruler-mode-show-tab-stops' is non-nil.