code: function handleHeaderMouseEnter(e, args) {
        var column = args.column,
            $node = $(e.target).closest(".slick-header-column");
        if (!column.toolTip) {
          $node.attr("title", ($node.innerWidth() < $node[0].scrollWidth) ? column.name : "");
        }
      }
docs: Handle mouse entering header cell to add/remove tooltip.
  @param {jQuery.Event} e     - The event
  @param {object} args.column - The column definition