tooltip-set-param

tooltip-set-param is a compiled Lisp function in `tooltip.el'.

(tooltip-set-param ALIST KEY VALUE)

This function is obsolete since 25.1;
use (setf (alist-get ..) ..) instead

Change the value of KEY in alist ALIST to VALUE.
If there's no association for KEY in ALIST, add one, otherwise
change the existing association. Value is the resulting alist.