in slick/slick.js [1809:1818]
Slick.prototype.setHeight = function() {
var _ = this;
if (_.options.slidesToShow === 1 && _.options.adaptiveHeight === true && _.options.vertical === false) {
var targetHeight = _.$slides.eq(_.currentSlide).outerHeight(true);
_.$list.css('height', targetHeight);
}
};