Gtk.Tooltip.prototype.set_icon_from_icon_name

function set_icon_from_icon_name(icon_name:String, size:Number):void {
    // Gjs wrapper for gtk_tooltip_set_icon_from_icon_name()
}

Sets the icon of the tooltip (which is in front of the text) to be the icon indicated by icon_name with the size indicated by size. If icon_name is null, the image will be hidden.

Since 2.14