Addresses Flickity bug #740 while someone figures out the next real solve

flickity-scrollfix.js

;(function() {
  var touchingCarousel = false
    , touchStartCoords

  document.body.addEventListener('touchstart', function(e) {
    if (e.target.closest('.carousel-cell')) {
      touchingCarousel = true
    } else {
      touchingCarousel = false
      return
    }

    touchStartCoords = {
      x: e.touches[0].pageX,
      y: e.touches[0].pageY
    }
  })

  document.body.addEventListener('touchmove', function(e) {
    if (!(touchingCarousel && e.cancelable)) return

    var moveVector = {
      x: e.touches[0].pageX - touchStartCoords.x,
      y: e.touches[0].pageY - touchStartCoords.y
    }

    if (Math.abs(moveVector.x) > Flickity.defaults.dragThreshold)
      e.preventDefault()

  }, {passive: false})

  // Polyfill for Element.closest
  // https://developer.mozilla.org/en-US/docs/Web/API/Element/closest
  if (!Element.prototype.matches) {
    Element.prototype.matches =
      Element.prototype.msMatchesSelector ||
      Element.prototype.webkitMatchesSelector
  }

  if (!Element.prototype.closest) {
    Element.prototype.closest =
      function(s) {
        var el = this

        do {
          if (el.matches(s)) return el
          el = el.parentElement || el.parentNode
        } while (el !== null && el.nodeType === 1)
        return null
      }
  }
})();