Adding upstream version 2.4.0.upstream/2.4.0upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

2 files changed, 2425 insertions, 0 deletions

diff --git a/public/js/vendor/Sortable.js b/public/js/vendor/Sortable.js
new file mode 100644
index 0000000..edb4e1c
--- /dev/null
+++ b/public/js/vendor/Sortable.js
@@ -0,0 +1,2349 @@
+/**!
+ * Sortable
+ * @author	RubaXa   <trash@rubaxa.org>
+ * @author	owenm    <owen23355@gmail.com>
+ * @license MIT
+ */
+
+(function sortableModule(factory) {
+    "use strict";
+
+    if (typeof define === "function" && define.amd) {
+        define(factory);
+    }
+    else if (typeof module != "undefined" && typeof module.exports != "undefined") {
+        module.exports = factory();
+    }
+    else {
+        /* jshint sub:true */
+        window["Sortable"] = factory();
+    }
+})(function sortableFactory() {
+    "use strict";
+
+    if (typeof window === "undefined" || !window.document) {
+        return function sortableError() {
+            throw new Error("Sortable.js requires a window with a document");
+        };
+    }
+
+    var dragEl,
+        parentEl,
+        ghostEl,
+        cloneEl,
+        rootEl,
+        nextEl,
+        lastDownEl,
+
+        scrollEl,
+        scrollParentEl,
+        scrollCustomFn,
+
+        oldIndex,
+        newIndex,
+
+        activeGroup,
+        putSortable,
+
+        autoScrolls = [],
+        scrolling = false,
+
+        awaitingDragStarted = false,
+        ignoreNextClick = false,
+        sortables = [],
+
+        pointerElemChangedInterval,
+        lastPointerElemX,
+        lastPointerElemY,
+
+        tapEvt,
+        touchEvt,
+
+        moved,
+
+
+        lastTarget,
+        lastDirection,
+        pastFirstInvertThresh = false,
+        isCircumstantialInvert = false,
+        lastMode, // 'swap' or 'insert'
+
+        targetMoveDistance,
+
+
+        forRepaintDummy,
+        realDragElRect, // dragEl rect after current animation
+
+        /** @const */
+        R_SPACE = /\s+/g,
+
+        expando = 'Sortable' + (new Date).getTime(),
+
+        win = window,
+        document = win.document,
+        parseInt = win.parseInt,
+        setTimeout = win.setTimeout,
+
+        $ = win.jQuery || win.Zepto,
+        Polymer = win.Polymer,
+
+        captureMode = {
+            capture: false,
+            passive: false
+        },
+
+        IE11OrLess = !!navigator.userAgent.match(/(?:Trident.*rv[ :]?11\.|msie|iemobile)/i),
+        Edge = !!navigator.userAgent.match(/Edge/i),
+        // FireFox = !!navigator.userAgent.match(/firefox/i),
+
+        CSSFloatProperty = Edge || IE11OrLess ? 'cssFloat' : 'float',
+
+        // This will not pass for IE9, because IE9 DnD only works on anchors
+        supportDraggable = ('draggable' in document.createElement('div')),
+
+        supportCssPointerEvents = (function() {
+            // false when <= IE11
+            if (IE11OrLess) {
+                return false;
+            }
+            var el = document.createElement('x');
+            el.style.cssText = 'pointer-events:auto';
+            return el.style.pointerEvents === 'auto';
+        })(),
+
+        _silent = false,
+        _alignedSilent = false,
+
+        abs = Math.abs,
+        min = Math.min,
+
+        savedInputChecked = [],
+
+        _detectDirection = function(el, options) {
+            var elCSS = _css(el),
+                elWidth = parseInt(elCSS.width),
+                child1 = _getChild(el, 0, options),
+                child2 = _getChild(el, 1, options),
+                firstChildCSS = child1 && _css(child1),
+                secondChildCSS = child2 && _css(child2),
+                firstChildWidth = firstChildCSS && parseInt(firstChildCSS.marginLeft) + parseInt(firstChildCSS.marginRight) + _getRect(child1).width,
+                secondChildWidth = secondChildCSS && parseInt(secondChildCSS.marginLeft) + parseInt(secondChildCSS.marginRight) + _getRect(child2).width;
+            if (elCSS.display === 'flex') {
+                return elCSS.flexDirection === 'column' || elCSS.flexDirection === 'column-reverse'
+                    ? 'vertical' : 'horizontal';
+            }
+            if (child1 && firstChildCSS.float !== 'none') {
+                var touchingSideChild2 = firstChildCSS.float === 'left' ? 'left' : 'right';
+
+                return child2 && (secondChildCSS.clear === 'both' || secondChildCSS.clear === touchingSideChild2) ?
+                    'vertical' : 'horizontal';
+            }
+            return (child1 &&
+                (
+                    firstChildCSS.display === 'block' ||
+                    firstChildCSS.display === 'flex' ||
+                    firstChildCSS.display === 'table' ||
+                    firstChildCSS.display === 'grid' ||
+                    firstChildWidth >= elWidth &&
+                    elCSS[CSSFloatProperty] === 'none' ||
+                    child2 &&
+                    elCSS[CSSFloatProperty] === 'none' &&
+                    firstChildWidth + secondChildWidth > elWidth
+                ) ?
+                    'vertical' : 'horizontal'
+            );
+        },
+
+        /**
+         * Detects first nearest empty sortable to X and Y position using emptyInsertThreshold.
+         * @param  {Number} x      X position
+         * @param  {Number} y      Y position
+         * @return {HTMLElement}   Element of the first found nearest Sortable
+         */
+        _detectNearestEmptySortable = function(x, y) {
+            for (var i = 0; i < sortables.length; i++) {
+                if (sortables[i].children.length) continue;
+
+                var rect = _getRect(sortables[i]),
+                    threshold = sortables[i][expando].options.emptyInsertThreshold,
+                    insideHorizontally = x >= (rect.left - threshold) && x <= (rect.right + threshold),
+                    insideVertically = y >= (rect.top - threshold) && y <= (rect.bottom + threshold);
+
+                if (insideHorizontally && insideVertically) {
+                    return sortables[i];
+                }
+            }
+        },
+
+        _isClientInRowColumn = function(x, y, el, axis, options) {
+            var targetRect = _getRect(el),
+                targetS1Opp = axis === 'vertical' ? targetRect.left : targetRect.top,
+                targetS2Opp = axis === 'vertical' ? targetRect.right : targetRect.bottom,
+                mouseOnOppAxis = axis === 'vertical' ? x : y;
+
+            return targetS1Opp < mouseOnOppAxis && mouseOnOppAxis < targetS2Opp;
+        },
+
+        _isElInRowColumn = function(el1, el2, axis) {
+            var el1Rect = el1 === dragEl && realDragElRect || _getRect(el1),
+                el2Rect = el2 === dragEl && realDragElRect || _getRect(el2),
+                el1S1Opp = axis === 'vertical' ? el1Rect.left : el1Rect.top,
+                el1S2Opp = axis === 'vertical' ? el1Rect.right : el1Rect.bottom,
+                el1OppLength = axis === 'vertical' ? el1Rect.width : el1Rect.height,
+                el2S1Opp = axis === 'vertical' ? el2Rect.left : el2Rect.top,
+                el2S2Opp = axis === 'vertical' ? el2Rect.right : el2Rect.bottom,
+                el2OppLength = axis === 'vertical' ? el2Rect.width : el2Rect.height;
+
+            return (
+                el1S1Opp === el2S1Opp ||
+                el1S2Opp === el2S2Opp ||
+                (el1S1Opp + el1OppLength / 2) === (el2S1Opp + el2OppLength / 2)
+            );
+        },
+
+        _getParentAutoScrollElement = function(el, includeSelf) {
+            // skip to window
+            if (!el || !el.getBoundingClientRect) return win;
+
+            var elem = el;
+            var gotSelf = false;
+            do {
+                // we don't need to get elem css if it isn't even overflowing in the first place (performance)
+                if (elem.clientWidth < elem.scrollWidth || elem.clientHeight < elem.scrollHeight) {
+                    var elemCSS = _css(elem);
+                    if (
+                        elem.clientWidth < elem.scrollWidth && (elemCSS.overflowX == 'auto' || elemCSS.overflowX == 'scroll') ||
+                        elem.clientHeight < elem.scrollHeight && (elemCSS.overflowY == 'auto' || elemCSS.overflowY == 'scroll')
+                    ) {
+                        if (!elem || !elem.getBoundingClientRect || elem === document.body) return win;
+
+                        if (gotSelf || includeSelf) return elem;
+                        gotSelf = true;
+                    }
+                }
+                /* jshint boss:true */
+            } while (elem = elem.parentNode);
+
+            return win;
+        },
+
+        _autoScroll = _throttle(function (/**Event*/evt, /**Object*/options, /**HTMLElement*/rootEl, /**Boolean*/isFallback) {
+            // Bug: https://bugzilla.mozilla.org/show_bug.cgi?id=505521
+            if (options.scroll) {
+                var _this = rootEl ? rootEl[expando] : window,
+                    sens = options.scrollSensitivity,
+                    speed = options.scrollSpeed,
+
+                    x = evt.clientX,
+                    y = evt.clientY,
+
+                    winWidth = window.innerWidth,
+                    winHeight = window.innerHeight,
+
+                    scrollThisInstance = false;
+
+                // Detect scrollEl
+                if (scrollParentEl !== rootEl) {
+                    _clearAutoScrolls();
+
+                    scrollEl = options.scroll;
+                    scrollCustomFn = options.scrollFn;
+
+                    if (scrollEl === true) {
+                        scrollEl = _getParentAutoScrollElement(rootEl, true);
+                        scrollParentEl = scrollEl;
+                    }
+                }
+
+
+                var layersOut = 0;
+                var currentParent = scrollEl;
+                do {
+                    var	el = currentParent,
+                        rect = _getRect(el),
+
+                        top = rect.top,
+                        bottom = rect.bottom,
+                        left = rect.left,
+                        right = rect.right,
+
+                        width = rect.width,
+                        height = rect.height,
+
+                        scrollWidth,
+                        scrollHeight,
+
+                        css,
+
+                        vx,
+                        vy,
+
+                        canScrollX,
+                        canScrollY,
+
+                        scrollPosX,
+                        scrollPosY;
+
+
+                    if (el !== win) {
+                        scrollWidth = el.scrollWidth;
+                        scrollHeight = el.scrollHeight;
+
+                        css = _css(el);
+
+                        canScrollX = width < scrollWidth && (css.overflowX === 'auto' || css.overflowX === 'scroll');
+                        canScrollY = height < scrollHeight && (css.overflowY === 'auto' || css.overflowY === 'scroll');
+
+                        scrollPosX = el.scrollLeft;
+                        scrollPosY = el.scrollTop;
+                    } else {
+                        scrollWidth = document.documentElement.scrollWidth;
+                        scrollHeight = document.documentElement.scrollHeight;
+
+                        css = _css(document.documentElement);
+
+                        canScrollX = width < scrollWidth && (css.overflowX === 'auto' || css.overflowX === 'scroll' || css.overflowX === 'visible');
+                        canScrollY = height < scrollHeight && (css.overflowY === 'auto' || css.overflowY === 'scroll' || css.overflowY === 'visible');
+
+                        scrollPosX = document.documentElement.scrollLeft;
+                        scrollPosY = document.documentElement.scrollTop;
+                    }
+
+                    vx = canScrollX && (abs(right - x) <= sens && (scrollPosX + width) < scrollWidth) - (abs(left - x) <= sens && !!scrollPosX);
+
+                    vy = canScrollY && (abs(bottom - y) <= sens && (scrollPosY + height) < scrollHeight) - (abs(top - y) <= sens && !!scrollPosY);
+
+
+                    if (!autoScrolls[layersOut]) {
+                        for (var i = 0; i <= layersOut; i++) {
+                            if (!autoScrolls[i]) {
+                                autoScrolls[i] = {};
+                            }
+                        }
+                    }
+
+                    if (autoScrolls[layersOut].vx != vx || autoScrolls[layersOut].vy != vy || autoScrolls[layersOut].el !== el) {
+                        autoScrolls[layersOut].el = el;
+                        autoScrolls[layersOut].vx = vx;
+                        autoScrolls[layersOut].vy = vy;
+
+                        clearInterval(autoScrolls[layersOut].pid);
+
+                        if (el && (vx != 0 || vy != 0)) {
+                            scrollThisInstance = true;
+                            /* jshint loopfunc:true */
+                            autoScrolls[layersOut].pid = setInterval((function () {
+                                // emulate drag over during autoscroll (fallback), emulating native DnD behaviour
+                                if (isFallback && this.layer === 0) {
+                                    Sortable.active._emulateDragOver(true);
+                                }
+                                var scrollOffsetY = autoScrolls[this.layer].vy ? autoScrolls[this.layer].vy * speed : 0;
+                                var scrollOffsetX = autoScrolls[this.layer].vx ? autoScrolls[this.layer].vx * speed : 0;
+
+                                if ('function' === typeof(scrollCustomFn)) {
+                                    if (scrollCustomFn.call(_this, scrollOffsetX, scrollOffsetY, evt, touchEvt, autoScrolls[this.layer].el) !== 'continue') {
+                                        return;
+                                    }
+                                }
+                                if (autoScrolls[this.layer].el === win) {
+                                    win.scrollTo(win.pageXOffset + scrollOffsetX, win.pageYOffset + scrollOffsetY);
+                                } else {
+                                    autoScrolls[this.layer].el.scrollTop += scrollOffsetY;
+                                    autoScrolls[this.layer].el.scrollLeft += scrollOffsetX;
+                                }
+                            }).bind({layer: layersOut}), 24);
+                        }
+                    }
+                    layersOut++;
+                } while (options.bubbleScroll && currentParent !== win && (currentParent = _getParentAutoScrollElement(currentParent, false)));
+                scrolling = scrollThisInstance; // in case another function catches scrolling as false in between when it is not
+            }
+        }, 30),
+
+        _clearAutoScrolls = function () {
+            autoScrolls.forEach(function(autoScroll) {
+                clearInterval(autoScroll.pid);
+            });
+            autoScrolls = [];
+        },
+
+        _prepareGroup = function (options) {
+            function toFn(value, pull) {
+                return function(to, from, dragEl, evt) {
+                    var sameGroup = to.options.group.name &&
+                        from.options.group.name &&
+                        to.options.group.name === from.options.group.name;
+
+                    if (value == null && (pull || sameGroup)) {
+                        // Default pull value
+                        // Default pull and put value if same group
+                        return true;
+                    } else if (value == null || value === false) {
+                        return false;
+                    } else if (pull && value === 'clone') {
+                        return value;
+                    } else if (typeof value === 'function') {
+                        return toFn(value(to, from, dragEl, evt), pull)(to, from, dragEl, evt);
+                    } else {
+                        var otherGroup = (pull ? to : from).options.group.name;
+
+                        return (value === true ||
+                            (typeof value === 'string' && value === otherGroup) ||
+                            (value.join && value.indexOf(otherGroup) > -1));
+                    }
+                };
+            }
+
+            var group = {};
+            var originalGroup = options.group;
+
+            if (!originalGroup || typeof originalGroup != 'object') {
+                originalGroup = {name: originalGroup};
+            }
+
+            group.name = originalGroup.name;
+            group.checkPull = toFn(originalGroup.pull, true);
+            group.checkPut = toFn(originalGroup.put);
+            group.revertClone = originalGroup.revertClone;
+
+            options.group = group;
+        },
+
+        _checkAlignment = function(evt) {
+            if (!dragEl || !dragEl.parentNode) return;
+            dragEl.parentNode[expando] && dragEl.parentNode[expando]._computeIsAligned(evt);
+        },
+
+        _isTrueParentSortable = function(el, target) {
+            var trueParent = target;
+            while (!trueParent[expando]) {
+                trueParent = trueParent.parentNode;
+            }
+
+            return el === trueParent;
+        },
+
+        _artificalBubble = function(sortable, originalEvt, method) {
+            // Artificial IE bubbling
+            var nextParent = sortable.parentNode;
+            while (nextParent && !nextParent[expando]) {
+                nextParent = nextParent.parentNode;
+            }
+
+            if (nextParent) {
+                nextParent[expando][method](_extend(originalEvt, {
+                    artificialBubble: true
+                }));
+            }
+        },
+
+        _hideGhostForTarget = function() {
+            if (!supportCssPointerEvents && ghostEl) {
+                _css(ghostEl, 'display', 'none');
+            }
+        },
+
+        _unhideGhostForTarget = function() {
+            if (!supportCssPointerEvents && ghostEl) {
+                _css(ghostEl, 'display', '');
+            }
+        };
+
+
+    // #1184 fix - Prevent click event on fallback if dragged but item not changed position
+    document.addEventListener('click', function(evt) {
+        if (ignoreNextClick) {
+            evt.preventDefault();
+            evt.stopPropagation && evt.stopPropagation();
+            evt.stopImmediatePropagation && evt.stopImmediatePropagation();
+            ignoreNextClick = false;
+            return false;
+        }
+    }, true);
+
+    var nearestEmptyInsertDetectEvent = function(evt) {
+        evt = evt.touches ? evt.touches[0] : evt;
+        if (dragEl) {
+            var nearest = _detectNearestEmptySortable(evt.clientX, evt.clientY);
+
+            if (nearest) {
+                nearest[expando]._onDragOver({
+                    clientX: evt.clientX,
+                    clientY: evt.clientY,
+                    target: nearest,
+                    rootEl: nearest
+                });
+            }
+        }
+    };
+    // We do not want this to be triggered if completed (bubbling canceled), so only define it here
+    _on(document, 'dragover', nearestEmptyInsertDetectEvent);
+    _on(document, 'mousemove', nearestEmptyInsertDetectEvent);
+    _on(document, 'touchmove', nearestEmptyInsertDetectEvent);
+
+    /**
+     * @class  Sortable
+     * @param  {HTMLElement}  el
+     * @param  {Object}       [options]
+     */
+    function Sortable(el, options) {
+        if (!(el && el.nodeType && el.nodeType === 1)) {
+            throw 'Sortable: `el` must be HTMLElement, not ' + {}.toString.call(el);
+        }
+
+        this.el = el; // root element
+        this.options = options = _extend({}, options);
+
+
+        // Export instance
+        el[expando] = this;
+
+        // Default options
+        var defaults = {
+            group: null,
+            sort: true,
+            disabled: false,
+            store: null,
+            handle: null,
+            scroll: true,
+            scrollSensitivity: 30,
+            scrollSpeed: 10,
+            bubbleScroll: true,
+            draggable: /[uo]l/i.test(el.nodeName) ? '>li' : '>*',
+            swapThreshold: 1, // percentage; 0 <= x <= 1
+            invertSwap: false, // invert always
+            invertedSwapThreshold: null, // will be set to same as swapThreshold if default
+            removeCloneOnHide: true,
+            direction: function() {
+                return _detectDirection(el, this.options);
+            },
+            ghostClass: 'sortable-ghost',
+            chosenClass: 'sortable-chosen',
+            dragClass: 'sortable-drag',
+            ignore: 'a, img',
+            filter: null,
+            preventOnFilter: true,
+            animation: 0,
+            easing: null,
+            setData: function (dataTransfer, dragEl) {
+                dataTransfer.setData('Text', dragEl.textContent);
+            },
+            dropBubble: false,
+            dragoverBubble: false,
+            dataIdAttr: 'data-id',
+            delay: 0,
+            touchStartThreshold: parseInt(window.devicePixelRatio, 10) || 1,
+            forceFallback: false,
+            fallbackClass: 'sortable-fallback',
+            fallbackOnBody: false,
+            fallbackTolerance: 0,
+            fallbackOffset: {x: 0, y: 0},
+            supportPointer: Sortable.supportPointer !== false && (
+                ('PointerEvent' in window) ||
+                window.navigator && ('msPointerEnabled' in window.navigator) // microsoft
+            ),
+            emptyInsertThreshold: 5
+        };
+
+
+        // Set default options
+        for (var name in defaults) {
+            !(name in options) && (options[name] = defaults[name]);
+        }
+
+        _prepareGroup(options);
+
+        // Bind all private methods
+        for (var fn in this) {
+            if (fn.charAt(0) === '_' && typeof this[fn] === 'function') {
+                this[fn] = this[fn].bind(this);
+            }
+        }
+
+        // Setup drag mode
+        this.nativeDraggable = options.forceFallback ? false : supportDraggable;
+
+        // Bind events
+        if (options.supportPointer) {
+            _on(el, 'pointerdown', this._onTapStart);
+        } else {
+            _on(el, 'mousedown', this._onTapStart);
+            _on(el, 'touchstart', this._onTapStart);
+        }
+
+        if (this.nativeDraggable) {
+            _on(el, 'dragover', this);
+            _on(el, 'dragenter', this);
+        }
+
+        sortables.push(this.el);
+
+        // Restore sorting
+        options.store && options.store.get && this.sort(options.store.get(this) || []);
+    }
+
+    Sortable.prototype = /** @lends Sortable.prototype */ {
+        constructor: Sortable,
+
+        _computeIsAligned: function(evt) {
+            var target;
+
+            if (ghostEl && !supportCssPointerEvents) {
+                _hideGhostForTarget();
+                target = document.elementFromPoint(evt.clientX, evt.clientY);
+                _unhideGhostForTarget();
+            } else {
+                target = evt.target;
+            }
+
+            target = _closest(target, this.options.draggable, this.el, false);
+            if (_alignedSilent) return;
+            if (!dragEl || dragEl.parentNode !== this.el) return;
+
+            var children = this.el.children;
+            for (var i = 0; i < children.length; i++) {
+                // Don't change for target in case it is changed to aligned before onDragOver is fired
+                if (_closest(children[i], this.options.draggable, this.el, false) && children[i] !== target) {
+                    children[i].sortableMouseAligned = _isClientInRowColumn(evt.clientX, evt.clientY, children[i], this._getDirection(evt, null), this.options);
+                }
+            }
+            // Used for nulling last target when not in element, nothing to do with checking if aligned
+            if (!_closest(target, this.options.draggable, this.el, true)) {
+                lastTarget = null;
+            }
+
+            _alignedSilent = true;
+            setTimeout(function() {
+                _alignedSilent = false;
+            }, 30);
+
+        },
+
+        _getDirection: function(evt, target) {
+            return (typeof this.options.direction === 'function') ? this.options.direction.call(this, evt, target, dragEl) : this.options.direction;
+        },
+
+        _onTapStart: function (/** Event|TouchEvent */evt) {
+            if (!evt.cancelable) return;
+            var _this = this,
+                el = this.el,
+                options = this.options,
+                preventOnFilter = options.preventOnFilter,
+                type = evt.type,
+                touch = evt.touches && evt.touches[0],
+                target = (touch || evt).target,
+                originalTarget = evt.target.shadowRoot && ((evt.path && evt.path[0]) || (evt.composedPath && evt.composedPath()[0])) || target,
+                filter = options.filter,
+                startIndex;
+
+            _saveInputCheckedState(el);
+
+
+            // IE: Calls events in capture mode if event element is nested. This ensures only correct element's _onTapStart goes through.
+            // This process is also done in _onDragOver
+            if (IE11OrLess && !evt.artificialBubble && !_isTrueParentSortable(el, target)) {
+                return;
+            }
+
+            // Don't trigger start event when an element is been dragged, otherwise the evt.oldindex always wrong when set option.group.
+            if (dragEl) {
+                return;
+            }
+
+            if (/mousedown|pointerdown/.test(type) && evt.button !== 0 || options.disabled) {
+                return; // only left button and enabled
+            }
+
+            // cancel dnd if original target is content editable
+            if (originalTarget.isContentEditable) {
+                return;
+            }
+
+            target = _closest(target, options.draggable, el, false);
+
+            if (!target) {
+                if (IE11OrLess) {
+                    _artificalBubble(el, evt, '_onTapStart');
+                }
+                return;
+            }
+
+            if (lastDownEl === target) {
+                // Ignoring duplicate `down`
+                return;
+            }
+
+            // Get the index of the dragged element within its parent
+            startIndex = _index(target, options.draggable);
+
+            // Check filter
+            if (typeof filter === 'function') {
+                if (filter.call(this, evt, target, this)) {
+                    _dispatchEvent(_this, originalTarget, 'filter', target, el, el, startIndex);
+                    preventOnFilter && evt.cancelable && evt.preventDefault();
+                    return; // cancel dnd
+                }
+            }
+            else if (filter) {
+                filter = filter.split(',').some(function (criteria) {
+                    criteria = _closest(originalTarget, criteria.trim(), el, false);
+
+                    if (criteria) {
+                        _dispatchEvent(_this, criteria, 'filter', target, el, el, startIndex);
+                        return true;
+                    }
+                });
+
+                if (filter) {
+                    preventOnFilter && evt.cancelable && evt.preventDefault();
+                    return; // cancel dnd
+                }
+            }
+
+            if (options.handle && !_closest(originalTarget, options.handle, el, false)) {
+                return;
+            }
+
+            // Prepare `dragstart`
+            this._prepareDragStart(evt, touch, target, startIndex);
+        },
+
+
+        _handleAutoScroll: function(evt, fallback) {
+            if (!dragEl || !this.options.scroll) return;
+            var x = evt.clientX,
+                y = evt.clientY,
+
+                elem = document.elementFromPoint(x, y),
+                _this = this;
+
+            // IE does not seem to have native autoscroll,
+            // Edge's autoscroll seems too conditional,
+            // Firefox and Chrome are good
+            if (fallback || Edge || IE11OrLess) {
+                _autoScroll(evt, _this.options, elem, fallback);
+
+                // Listener for pointer element change
+                var ogElemScroller = _getParentAutoScrollElement(elem, true);
+                if (
+                    scrolling &&
+                    (
+                        !pointerElemChangedInterval ||
+                        x !== lastPointerElemX ||
+                        y !== lastPointerElemY
+                    )
+                ) {
+
+                    pointerElemChangedInterval && clearInterval(pointerElemChangedInterval);
+                    // Detect for pointer elem change, emulating native DnD behaviour
+                    pointerElemChangedInterval = setInterval(function() {
+                        if (!dragEl) return;
+                        // could also check if scroll direction on newElem changes due to parent autoscrolling
+                        var newElem = _getParentAutoScrollElement(document.elementFromPoint(x, y), true);
+                        if (newElem !== ogElemScroller) {
+                            ogElemScroller = newElem;
+                            _clearAutoScrolls();
+                            _autoScroll(evt, _this.options, ogElemScroller, fallback);
+                        }
+                    }, 10);
+                    lastPointerElemX = x;
+                    lastPointerElemY = y;
+                }
+
+            } else {
+                // if DnD is enabled (and browser has good autoscrolling), first autoscroll will already scroll, so get parent autoscroll of first autoscroll
+                if (!_this.options.bubbleScroll || _getParentAutoScrollElement(elem, true) === window) {
+                    _clearAutoScrolls();
+                    return;
+                }
+                _autoScroll(evt, _this.options, _getParentAutoScrollElement(elem, false), false);
+            }
+        },
+
+        _prepareDragStart: function (/** Event */evt, /** Touch */touch, /** HTMLElement */target, /** Number */startIndex) {
+            var _this = this,
+                el = _this.el,
+                options = _this.options,
+                ownerDocument = el.ownerDocument,
+                dragStartFn;
+
+            if (target && !dragEl && (target.parentNode === el)) {
+                rootEl = el;
+                dragEl = target;
+                parentEl = dragEl.parentNode;
+                nextEl = dragEl.nextSibling;
+                lastDownEl = target;
+                activeGroup = options.group;
+                oldIndex = startIndex;
+
+                tapEvt = {
+                    target: dragEl,
+                    clientX: (touch || evt).clientX,
+                    clientY: (touch || evt).clientY
+                };
+
+                this._lastX = (touch || evt).clientX;
+                this._lastY = (touch || evt).clientY;
+
+                dragEl.style['will-change'] = 'all';
+                // undo animation if needed
+                dragEl.style.transition = '';
+                dragEl.style.transform = '';
+
+                dragStartFn = function () {
+                    // Delayed drag has been triggered
+                    // we can re-enable the events: touchmove/mousemove
+                    _this._disableDelayedDrag();
+
+                    // Make the element draggable
+                    dragEl.draggable = _this.nativeDraggable;
+
+                    // Bind the events: dragstart/dragend
+                    _this._triggerDragStart(evt, touch);
+
+                    // Drag start event
+                    _dispatchEvent(_this, rootEl, 'choose', dragEl, rootEl, rootEl, oldIndex);
+
+                    // Chosen item
+                    _toggleClass(dragEl, options.chosenClass, true);
+                };
+
+                // Disable "draggable"
+                options.ignore.split(',').forEach(function (criteria) {
+                    _find(dragEl, criteria.trim(), _disableDraggable);
+                });
+
+                if (options.supportPointer) {
+                    _on(ownerDocument, 'pointerup', _this._onDrop);
+                } else {
+                    _on(ownerDocument, 'mouseup', _this._onDrop);
+                    _on(ownerDocument, 'touchend', _this._onDrop);
+                    _on(ownerDocument, 'touchcancel', _this._onDrop);
+                }
+
+                if (options.delay) {
+                    // If the user moves the pointer or let go the click or touch
+                    // before the delay has been reached:
+                    // disable the delayed drag
+                    _on(ownerDocument, 'mouseup', _this._disableDelayedDrag);
+                    _on(ownerDocument, 'touchend', _this._disableDelayedDrag);
+                    _on(ownerDocument, 'touchcancel', _this._disableDelayedDrag);
+                    _on(ownerDocument, 'mousemove', _this._delayedDragTouchMoveHandler);
+                    _on(ownerDocument, 'touchmove', _this._delayedDragTouchMoveHandler);
+                    options.supportPointer && _on(ownerDocument, 'pointermove', _this._delayedDragTouchMoveHandler);
+
+                    _this._dragStartTimer = setTimeout(dragStartFn, options.delay);
+                } else {
+                    dragStartFn();
+                }
+            }
+        },
+
+        _delayedDragTouchMoveHandler: function (/** TouchEvent|PointerEvent **/e) {
+            var touch = e.touches ? e.touches[0] : e;
+            if (min(abs(touch.clientX - this._lastX), abs(touch.clientY - this._lastY))
+                >= this.options.touchStartThreshold
+            ) {
+                this._disableDelayedDrag();
+            }
+        },
+
+        _disableDelayedDrag: function () {
+            var ownerDocument = this.el.ownerDocument;
+
+            clearTimeout(this._dragStartTimer);
+            _off(ownerDocument, 'mouseup', this._disableDelayedDrag);
+            _off(ownerDocument, 'touchend', this._disableDelayedDrag);
+            _off(ownerDocument, 'touchcancel', this._disableDelayedDrag);
+            _off(ownerDocument, 'mousemove', this._delayedDragTouchMoveHandler);
+            _off(ownerDocument, 'touchmove', this._delayedDragTouchMoveHandler);
+            _off(ownerDocument, 'pointermove', this._delayedDragTouchMoveHandler);
+        },
+
+        _triggerDragStart: function (/** Event */evt, /** Touch */touch) {
+            touch = touch || (evt.pointerType == 'touch' ? evt : null);
+
+            if (!this.nativeDraggable || touch) {
+                if (this.options.supportPointer) {
+                    _on(document, 'pointermove', this._onTouchMove);
+                } else if (touch) {
+                    _on(document, 'touchmove', this._onTouchMove);
+                } else {
+                    _on(document, 'mousemove', this._onTouchMove);
+                }
+            } else {
+                _on(dragEl, 'dragend', this);
+                _on(rootEl, 'dragstart', this._onDragStart);
+            }
+
+            try {
+                if (document.selection) {
+                    // Timeout neccessary for IE9
+                    _nextTick(function () {
+                        document.selection.empty();
+                    });
+                } else {
+                    window.getSelection().removeAllRanges();
+                }
+            } catch (err) {
+            }
+        },
+
+        _dragStarted: function (fallback) {
+            awaitingDragStarted = false;
+            if (rootEl && dragEl) {
+                if (this.nativeDraggable) {
+                    _on(document, 'dragover', this._handleAutoScroll);
+                    _on(document, 'dragover', _checkAlignment);
+                }
+                var options = this.options;
+
+                // Apply effect
+                !fallback && _toggleClass(dragEl, options.dragClass, false);
+                _toggleClass(dragEl, options.ghostClass, true);
+
+                // In case dragging an animated element
+                _css(dragEl, 'transform', '');
+
+                Sortable.active = this;
+
+                fallback && this._appendGhost();
+
+                // Drag start event
+                _dispatchEvent(this, rootEl, 'start', dragEl, rootEl, rootEl, oldIndex);
+            } else {
+                this._nulling();
+            }
+        },
+
+        _emulateDragOver: function (bypassLastTouchCheck) {
+            if (touchEvt) {
+                if (this._lastX === touchEvt.clientX && this._lastY === touchEvt.clientY && !bypassLastTouchCheck) {
+                    return;
+                }
+                this._lastX = touchEvt.clientX;
+                this._lastY = touchEvt.clientY;
+
+                _hideGhostForTarget();
+
+                var target = document.elementFromPoint(touchEvt.clientX, touchEvt.clientY);
+                var parent = target;
+
+                while (target && target.shadowRoot) {
+                    target = target.shadowRoot.elementFromPoint(touchEvt.clientX, touchEvt.clientY);
+                    parent = target;
+                }
+
+                if (parent) {
+                    do {
+                        if (parent[expando]) {
+                            var inserted;
+
+                            inserted = parent[expando]._onDragOver({
+                                clientX: touchEvt.clientX,
+                                clientY: touchEvt.clientY,
+                                target: target,
+                                rootEl: parent
+                            });
+
+                            if (inserted && !this.options.dragoverBubble) {
+                                break;
+                            }
+                        }
+
+                        target = parent; // store last element
+                    }
+                        /* jshint boss:true */
+                    while (parent = parent.parentNode);
+                }
+                dragEl.parentNode[expando]._computeIsAligned(touchEvt);
+
+                _unhideGhostForTarget();
+            }
+        },
+
+
+        _onTouchMove: function (/**TouchEvent*/evt) {
+            if (tapEvt) {
+                var	options = this.options,
+                    fallbackTolerance = options.fallbackTolerance,
+                    fallbackOffset = options.fallbackOffset,
+                    touch = evt.touches ? evt.touches[0] : evt,
+                    matrix = ghostEl && _matrix(ghostEl),
+                    scaleX = ghostEl && matrix && matrix.a,
+                    scaleY = ghostEl && matrix && matrix.d,
+                    dx = ((touch.clientX - tapEvt.clientX) + fallbackOffset.x) / (scaleX ? scaleX : 1),
+                    dy = ((touch.clientY - tapEvt.clientY) + fallbackOffset.y) / (scaleY ? scaleY : 1),
+                    translate3d = evt.touches ? 'translate3d(' + dx + 'px,' + dy + 'px,0)' : 'translate(' + dx + 'px,' + dy + 'px)';
+
+
+                // only set the status to dragging, when we are actually dragging
+                if (!Sortable.active && !awaitingDragStarted) {
+                    if (fallbackTolerance &&
+                        min(abs(touch.clientX - this._lastX), abs(touch.clientY - this._lastY)) < fallbackTolerance
+                    ) {
+                        return;
+                    }
+                    this._onDragStart(evt, true);
+                }
+
+                this._handleAutoScroll(touch, true);
+
+
+                moved = true;
+                touchEvt = touch;
+
+
+                _css(ghostEl, 'webkitTransform', translate3d);
+                _css(ghostEl, 'mozTransform', translate3d);
+                _css(ghostEl, 'msTransform', translate3d);
+                _css(ghostEl, 'transform', translate3d);
+
+                evt.cancelable && evt.preventDefault();
+            }
+        },
+
+        _appendGhost: function () {
+            if (!ghostEl) {
+                var rect = _getRect(dragEl, this.options.fallbackOnBody ? document.body : rootEl, true),
+                    css = _css(dragEl),
+                    options = this.options;
+
+                ghostEl = dragEl.cloneNode(true);
+
+                _toggleClass(ghostEl, options.ghostClass, false);
+                _toggleClass(ghostEl, options.fallbackClass, true);
+                _toggleClass(ghostEl, options.dragClass, true);
+
+                _css(ghostEl, 'box-sizing', 'border-box');
+                _css(ghostEl, 'margin', 0);
+                _css(ghostEl, 'top', rect.top);
+                _css(ghostEl, 'left', rect.left);
+                _css(ghostEl, 'width', rect.width);
+                _css(ghostEl, 'height', rect.height);
+                _css(ghostEl, 'opacity', '0.8');
+                _css(ghostEl, 'position', 'fixed');
+                _css(ghostEl, 'zIndex', '100000');
+                _css(ghostEl, 'pointerEvents', 'none');
+
+                options.fallbackOnBody && document.body.appendChild(ghostEl) || rootEl.appendChild(ghostEl);
+            }
+        },
+
+        _onDragStart: function (/**Event*/evt, /**boolean*/fallback) {
+            var _this = this;
+            var dataTransfer = evt.dataTransfer;
+            var options = _this.options;
+
+            // Setup clone
+            cloneEl = _clone(dragEl);
+
+            cloneEl.draggable = false;
+            cloneEl.style['will-change'] = '';
+
+            this._hideClone();
+
+            _toggleClass(cloneEl, _this.options.chosenClass, false);
+
+
+            // #1143: IFrame support workaround
+            _this._cloneId = _nextTick(function () {
+                if (!_this.options.removeCloneOnHide) {
+                    rootEl.insertBefore(cloneEl, dragEl);
+                }
+                _dispatchEvent(_this, rootEl, 'clone', dragEl);
+            });
+
+
+            !fallback && _toggleClass(dragEl, options.dragClass, true);
+
+            // Set proper drop events
+            if (fallback) {
+                ignoreNextClick = true;
+                _this._loopId = setInterval(_this._emulateDragOver, 50);
+            } else {
+                // Undo what was set in _prepareDragStart before drag started
+                _off(document, 'mouseup', _this._onDrop);
+                _off(document, 'touchend', _this._onDrop);
+                _off(document, 'touchcancel', _this._onDrop);
+
+                if (dataTransfer) {
+                    dataTransfer.effectAllowed = 'move';
+                    options.setData && options.setData.call(_this, dataTransfer, dragEl);
+                }
+
+                _on(document, 'drop', _this);
+
+                // #1276 fix:
+                _css(dragEl, 'transform', 'translateZ(0)');
+            }
+
+            awaitingDragStarted = true;
+
+            _this._dragStartId = _nextTick(_this._dragStarted.bind(_this, fallback));
+            _on(document, 'selectstart', _this);
+        },
+
+        // Returns true - if no further action is needed (either inserted or another condition)
+        _onDragOver: function (/**Event*/evt) {
+            var el = this.el,
+                target = evt.target,
+                dragRect,
+                targetRect,
+                revert,
+                options = this.options,
+                group = options.group,
+                activeSortable = Sortable.active,
+                isOwner = (activeGroup === group),
+                canSort = options.sort,
+                _this = this;
+
+            if (_silent) return;
+
+            // IE event order fix
+            if (IE11OrLess && !evt.rootEl && !evt.artificialBubble && !_isTrueParentSortable(el, target)) {
+                return;
+            }
+
+            // Return invocation when no further action is needed in another sortable
+            function completed() {
+                if (activeSortable) {
+                    // Set ghost class to new sortable's ghost class
+                    _toggleClass(dragEl, putSortable ? putSortable.options.ghostClass : activeSortable.options.ghostClass, false);
+                    _toggleClass(dragEl, options.ghostClass, true);
+                }
+
+                if (putSortable !== _this && _this !== Sortable.active) {
+                    putSortable = _this;
+                } else if (_this === Sortable.active) {
+                    putSortable = null;
+                }
+
+
+                // Null lastTarget if it is not inside a previously swapped element
+                if ((target === dragEl && !dragEl.animated) || (target === el && !target.animated)) {
+                    lastTarget = null;
+                }
+                // no bubbling and not fallback
+                if (!options.dragoverBubble && !evt.rootEl && target !== document) {
+                    _this._handleAutoScroll(evt);
+                    dragEl.parentNode[expando]._computeIsAligned(evt);
+                }
+
+                !options.dragoverBubble && evt.stopPropagation && evt.stopPropagation();
+
+                return true;
+            }
+
+            // Call when dragEl has been inserted
+            function changed() {
+                _dispatchEvent(_this, rootEl, 'change', target, el, rootEl, oldIndex, _index(dragEl, options.draggable), evt);
+            }
+
+
+            if (evt.preventDefault !== void 0) {
+                evt.cancelable && evt.preventDefault();
+            }
+
+
+            moved = true;
+
+            target = _closest(target, options.draggable, el, true);
+
+            // target is dragEl or target is animated
+            if (!!_closest(evt.target, null, dragEl, true) || target.animated) {
+                return completed();
+            }
+
+            if (target !== dragEl) {
+                ignoreNextClick = false;
+            }
+
+            if (activeSortable && !options.disabled &&
+                (isOwner
+                        ? canSort || (revert = !rootEl.contains(dragEl)) // Reverting item into the original list
+                        : (
+                            putSortable === this ||
+                            (
+                                (this.lastPutMode = activeGroup.checkPull(this, activeSortable, dragEl, evt)) &&
+                                group.checkPut(this, activeSortable, dragEl, evt)
+                            )
+                        )
+                )
+            ) {
+                var axis = this._getDirection(evt, target);
+
+                dragRect = _getRect(dragEl);
+
+                if (revert) {
+                    this._hideClone();
+                    parentEl = rootEl; // actualization
+
+                    if (nextEl) {
+                        rootEl.insertBefore(dragEl, nextEl);
+                    } else {
+                        rootEl.appendChild(dragEl);
+                    }
+
+                    return completed();
+                }
+
+                if ((el.children.length === 0) || (el.children[0] === ghostEl) ||
+                    _ghostIsLast(evt, axis, el) && !dragEl.animated
+                ) {
+                    //assign target only if condition is true
+                    if (el.children.length !== 0 && el.children[0] !== ghostEl && el === evt.target) {
+                        target = _lastChild(el);
+                    }
+
+                    if (target) {
+                        targetRect = _getRect(target);
+                    }
+
+                    if (isOwner) {
+                        activeSortable._hideClone();
+                    } else {
+                        activeSortable._showClone(this);
+                    }
+
+                    if (_onMove(rootEl, el, dragEl, dragRect, target, targetRect, evt, !!target) !== false) {
+                        el.appendChild(dragEl);
+                        parentEl = el; // actualization
+                        realDragElRect = null;
+
+                        changed();
+                        this._animate(dragRect, dragEl);
+                        target && this._animate(targetRect, target);
+                        return completed();
+                    }
+                }
+                else if (target && target !== dragEl && target.parentNode === el) {
+                    var direction = 0,
+                        targetBeforeFirstSwap,
+                        aligned = target.sortableMouseAligned,
+                        differentLevel = dragEl.parentNode !== el,
+                        scrolledPastTop = _isScrolledPast(target, axis === 'vertical' ? 'top' : 'left');
+
+                    if (lastTarget !== target) {
+                        lastMode = null;
+                        targetBeforeFirstSwap = _getRect(target)[axis === 'vertical' ? 'top' : 'left'];
+                        pastFirstInvertThresh = false;
+                    }
+
+                    // Reference: https://www.lucidchart.com/documents/view/10fa0e93-e362-4126-aca2-b709ee56bd8b/0
+                    if (
+                        _isElInRowColumn(dragEl, target, axis) && aligned ||
+                        differentLevel ||
+                        scrolledPastTop ||
+                        options.invertSwap ||
+                        lastMode === 'insert' ||
+                        // Needed, in the case that we are inside target and inserted because not aligned... aligned will stay false while inside
+                        // and lastMode will change to 'insert', but we must swap
+                        lastMode === 'swap'
+                    ) {
+                        // New target that we will be inside
+                        if (lastMode !== 'swap') {
+                            isCircumstantialInvert = options.invertSwap || differentLevel || scrolling || scrolledPastTop;
+                        }
+
+                        direction = _getSwapDirection(evt, target, axis,
+                            options.swapThreshold, options.invertedSwapThreshold == null ? options.swapThreshold : options.invertedSwapThreshold,
+                            isCircumstantialInvert,
+                            lastTarget === target);
+                        lastMode = 'swap';
+                    } else {
+                        // Insert at position
+                        direction = _getInsertDirection(target, options);
+                        lastMode = 'insert';
+                    }
+                    if (direction === 0) return completed();
+
+                    realDragElRect = null;
+                    lastTarget = target;
+
+                    lastDirection = direction;
+
+                    targetRect = _getRect(target);
+
+                    var nextSibling = target.nextElementSibling,
+                        after = false;
+
+                    after = direction === 1;
+
+                    var moveVector = _onMove(rootEl, el, dragEl, dragRect, target, targetRect, evt, after);
+
+                    if (moveVector !== false) {
+                        if (moveVector === 1 || moveVector === -1) {
+                            after = (moveVector === 1);
+                        }
+
+                        _silent = true;
+                        setTimeout(_unsilent, 30);
+
+                        if (isOwner) {
+                            activeSortable._hideClone();
+                        } else {
+                            activeSortable._showClone(this);
+                        }
+
+                        if (after && !nextSibling) {
+                            el.appendChild(dragEl);
+                        } else {
+                            target.parentNode.insertBefore(dragEl, after ? nextSibling : target);
+                        }
+
+                        parentEl = dragEl.parentNode; // actualization
+
+                        // must be done before animation
+                        if (targetBeforeFirstSwap !== undefined && !isCircumstantialInvert) {
+                            targetMoveDistance = abs(targetBeforeFirstSwap - _getRect(target)[axis === 'vertical' ? 'top' : 'left']);
+                        }
+                        changed();
+                        !differentLevel && this._animate(targetRect, target);
+                        this._animate(dragRect, dragEl);
+
+                        return completed();
+                    }
+                }
+
+                if (el.contains(dragEl)) {
+                    return completed();
+                }
+            }
+
+            if (IE11OrLess && !evt.rootEl) {
+                _artificalBubble(el, evt, '_onDragOver');
+            }
+
+            return false;
+        },
+
+        _animate: function (prevRect, target) {
+            var ms = this.options.animation;
+
+            if (ms) {
+                var currentRect = _getRect(target);
+
+                if (target === dragEl) {
+                    realDragElRect = currentRect;
+                }
+
+                if (prevRect.nodeType === 1) {
+                    prevRect = _getRect(prevRect);
+                }
+
+                // Check if actually moving position
+                if ((prevRect.left + prevRect.width / 2) !== (currentRect.left + currentRect.width / 2)
+                    || (prevRect.top + prevRect.height / 2) !== (currentRect.top + currentRect.height / 2)
+                ) {
+                    var matrix = _matrix(this.el),
+                        scaleX = matrix && matrix.a,
+                        scaleY = matrix && matrix.d;
+
+                    _css(target, 'transition', 'none');
+                    _css(target, 'transform', 'translate3d('
+                        + (prevRect.left - currentRect.left) / (scaleX ? scaleX : 1) + 'px,'
+                        + (prevRect.top - currentRect.top) / (scaleY ? scaleY : 1) + 'px,0)'
+                    );
+
+                    forRepaintDummy = target.offsetWidth; // repaint
+                    _css(target, 'transition', 'transform ' + ms + 'ms' + (this.options.easing ? ' ' + this.options.easing : ''));
+                    _css(target, 'transform', 'translate3d(0,0,0)');
+                }
+
+                (typeof target.animated === 'number') && clearTimeout(target.animated);
+                target.animated = setTimeout(function () {
+                    _css(target, 'transition', '');
+                    _css(target, 'transform', '');
+                    target.animated = false;
+                }, ms);
+            }
+        },
+
+        _offUpEvents: function () {
+            var ownerDocument = this.el.ownerDocument;
+
+            _off(document, 'touchmove', this._onTouchMove);
+            _off(document, 'pointermove', this._onTouchMove);
+            _off(ownerDocument, 'mouseup', this._onDrop);
+            _off(ownerDocument, 'touchend', this._onDrop);
+            _off(ownerDocument, 'pointerup', this._onDrop);
+            _off(ownerDocument, 'touchcancel', this._onDrop);
+            _off(document, 'selectstart', this);
+        },
+
+        _onDrop: function (/**Event*/evt) {
+            var el = this.el,
+                options = this.options;
+            awaitingDragStarted = false;
+            scrolling = false;
+            isCircumstantialInvert = false;
+            pastFirstInvertThresh = false;
+
+            clearInterval(this._loopId);
+
+            clearInterval(pointerElemChangedInterval);
+            _clearAutoScrolls();
+            _cancelThrottle();
+
+            clearTimeout(this._dragStartTimer);
+
+            _cancelNextTick(this._cloneId);
+            _cancelNextTick(this._dragStartId);
+
+            // Unbind events
+            _off(document, 'mousemove', this._onTouchMove);
+
+
+            if (this.nativeDraggable) {
+                _off(document, 'drop', this);
+                _off(el, 'dragstart', this._onDragStart);
+                _off(document, 'dragover', this._handleAutoScroll);
+                _off(document, 'dragover', _checkAlignment);
+            }
+
+            this._offUpEvents();
+
+            if (evt) {
+                if (moved) {
+                    evt.cancelable && evt.preventDefault();
+                    !options.dropBubble && evt.stopPropagation();
+                }
+
+                ghostEl && ghostEl.parentNode && ghostEl.parentNode.removeChild(ghostEl);
+
+                if (rootEl === parentEl || (putSortable && putSortable.lastPutMode !== 'clone')) {
+                    // Remove clone
+                    cloneEl && cloneEl.parentNode && cloneEl.parentNode.removeChild(cloneEl);
+                }
+
+                if (dragEl) {
+                    if (this.nativeDraggable) {
+                        _off(dragEl, 'dragend', this);
+                    }
+
+                    _disableDraggable(dragEl);
+                    dragEl.style['will-change'] = '';
+
+                    // Remove class's
+                    _toggleClass(dragEl, putSortable ? putSortable.options.ghostClass : this.options.ghostClass, false);
+                    _toggleClass(dragEl, this.options.chosenClass, false);
+
+                    // Drag stop event
+                    _dispatchEvent(this, rootEl, 'unchoose', dragEl, parentEl, rootEl, oldIndex, null, evt);
+
+                    if (rootEl !== parentEl) {
+                        newIndex = _index(dragEl, options.draggable);
+
+                        if (newIndex >= 0) {
+                            // Add event
+                            _dispatchEvent(null, parentEl, 'add', dragEl, parentEl, rootEl, oldIndex, newIndex, evt);
+
+                            // Remove event
+                            _dispatchEvent(this, rootEl, 'remove', dragEl, parentEl, rootEl, oldIndex, newIndex, evt);
+
+                            // drag from one list and drop into another
+                            _dispatchEvent(null, parentEl, 'sort', dragEl, parentEl, rootEl, oldIndex, newIndex, evt);
+                            _dispatchEvent(this, rootEl, 'sort', dragEl, parentEl, rootEl, oldIndex, newIndex, evt);
+                        }
+
+                        putSortable && putSortable.save();
+                    }
+                    else {
+                        if (dragEl.nextSibling !== nextEl) {
+                            // Get the index of the dragged element within its parent
+                            newIndex = _index(dragEl, options.draggable);
+
+                            if (newIndex >= 0) {
+                                // drag & drop within the same list
+                                _dispatchEvent(this, rootEl, 'update', dragEl, parentEl, rootEl, oldIndex, newIndex, evt);
+                                _dispatchEvent(this, rootEl, 'sort', dragEl, parentEl, rootEl, oldIndex, newIndex, evt);
+                            }
+                        }
+                    }
+
+                    if (Sortable.active) {
+                        /* jshint eqnull:true */
+                        if (newIndex == null || newIndex === -1) {
+                            newIndex = oldIndex;
+                        }
+
+                        _dispatchEvent(this, rootEl, 'end', dragEl, parentEl, rootEl, oldIndex, newIndex, evt);
+
+                        // Save sorting
+                        this.save();
+                    }
+                }
+
+            }
+            this._nulling();
+        },
+
+        _nulling: function() {
+            rootEl =
+                dragEl =
+                    parentEl =
+                        ghostEl =
+                            nextEl =
+                                cloneEl =
+                                    lastDownEl =
+
+                                        scrollEl =
+                                            scrollParentEl =
+                                                autoScrolls.length =
+
+                                                    pointerElemChangedInterval =
+                                                        lastPointerElemX =
+                                                            lastPointerElemY =
+
+                                                                tapEvt =
+                                                                    touchEvt =
+
+                                                                        moved =
+                                                                            newIndex =
+                                                                                oldIndex =
+
+                                                                                    lastTarget =
+                                                                                        lastDirection =
+
+                                                                                            forRepaintDummy =
+                                                                                                realDragElRect =
+
+                                                                                                    putSortable =
+                                                                                                        activeGroup =
+                                                                                                            Sortable.active = null;
+
+            savedInputChecked.forEach(function (el) {
+                el.checked = true;
+            });
+
+            savedInputChecked.length = 0;
+        },
+
+        handleEvent: function (/**Event*/evt) {
+            switch (evt.type) {
+                case 'drop':
+                case 'dragend':
+                    this._onDrop(evt);
+                    break;
+
+                case 'dragenter':
+                case 'dragover':
+                    if (dragEl) {
+                        this._onDragOver(evt);
+                        _globalDragOver(evt);
+                    }
+                    break;
+
+                case 'selectstart':
+                    evt.preventDefault();
+                    break;
+            }
+        },
+
+
+        /**
+         * Serializes the item into an array of string.
+         * @returns {String[]}
+         */
+        toArray: function () {
+            var order = [],
+                el,
+                children = this.el.children,
+                i = 0,
+                n = children.length,
+                options = this.options;
+
+            for (; i < n; i++) {
+                el = children[i];
+                if (_closest(el, options.draggable, this.el, false)) {
+                    order.push(el.getAttribute(options.dataIdAttr) || _generateId(el));
+                }
+            }
+
+            return order;
+        },
+
+
+        /**
+         * Sorts the elements according to the array.
+         * @param  {String[]}  order  order of the items
+         */
+        sort: function (order) {
+            var items = {}, rootEl = this.el;
+
+            this.toArray().forEach(function (id, i) {
+                var el = rootEl.children[i];
+
+                if (_closest(el, this.options.draggable, rootEl, false)) {
+                    items[id] = el;
+                }
+            }, this);
+
+            order.forEach(function (id) {
+                if (items[id]) {
+                    rootEl.removeChild(items[id]);
+                    rootEl.appendChild(items[id]);
+                }
+            });
+        },
+
+
+        /**
+         * Save the current sorting
+         */
+        save: function () {
+            var store = this.options.store;
+            store && store.set && store.set(this);
+        },
+
+
+        /**
+         * For each element in the set, get the first element that matches the selector by testing the element itself and traversing up through its ancestors in the DOM tree.
+         * @param   {HTMLElement}  el
+         * @param   {String}       [selector]  default: `options.draggable`
+         * @returns {HTMLElement|null}
+         */
+        closest: function (el, selector) {
+            return _closest(el, selector || this.options.draggable, this.el, false);
+        },
+
+
+        /**
+         * Set/get option
+         * @param   {string} name
+         * @param   {*}      [value]
+         * @returns {*}
+         */
+        option: function (name, value) {
+            var options = this.options;
+
+            if (value === void 0) {
+                return options[name];
+            } else {
+                options[name] = value;
+
+                if (name === 'group') {
+                    _prepareGroup(options);
+                }
+            }
+        },
+
+
+        /**
+         * Destroy
+         */
+        destroy: function () {
+            var el = this.el;
+
+            el[expando] = null;
+
+            _off(el, 'mousedown', this._onTapStart);
+            _off(el, 'touchstart', this._onTapStart);
+            _off(el, 'pointerdown', this._onTapStart);
+
+            if (this.nativeDraggable) {
+                _off(el, 'dragover', this);
+                _off(el, 'dragenter', this);
+            }
+            // Remove draggable attributes
+            Array.prototype.forEach.call(el.querySelectorAll('[draggable]'), function (el) {
+                el.removeAttribute('draggable');
+            });
+
+            this._onDrop();
+
+            sortables.splice(sortables.indexOf(this.el), 1);
+
+            this.el = el = null;
+        },
+
+        _hideClone: function() {
+            if (!cloneEl.cloneHidden) {
+                _css(cloneEl, 'display', 'none');
+                cloneEl.cloneHidden = true;
+                if (cloneEl.parentNode && this.options.removeCloneOnHide) {
+                    cloneEl.parentNode.removeChild(cloneEl);
+                }
+            }
+        },
+
+        _showClone: function(putSortable) {
+            if (putSortable.lastPutMode !== 'clone') {
+                this._hideClone();
+                return;
+            }
+
+            if (cloneEl.cloneHidden) {
+                // show clone at dragEl or original position
+                if (rootEl.contains(dragEl) && !this.options.group.revertClone) {
+                    rootEl.insertBefore(cloneEl, dragEl);
+                } else if (nextEl) {
+                    rootEl.insertBefore(cloneEl, nextEl);
+                } else {
+                    rootEl.appendChild(cloneEl);
+                }
+
+                if (this.options.group.revertClone) {
+                    this._animate(dragEl, cloneEl);
+                }
+                _css(cloneEl, 'display', '');
+                cloneEl.cloneHidden = false;
+            }
+        }
+    };
+
+    function _closest(/**HTMLElement*/el, /**String*/selector, /**HTMLElement*/ctx, includeCTX) {
+        if (el) {
+            ctx = ctx || document;
+
+            do {
+                if (
+                    selector != null &&
+                    (
+                        selector[0] === '>' && el.parentNode === ctx && _matches(el, selector.substring(1)) ||
+                        _matches(el, selector)
+                    ) ||
+                    includeCTX && el === ctx
+                ) {
+                    return el;
+                }
+
+                if (el === ctx) break;
+                /* jshint boss:true */
+            } while (el = _getParentOrHost(el));
+        }
+
+        return null;
+    }
+
+
+    function _getParentOrHost(el) {
+        return (el.host && el !== document && el.host.nodeType)
+            ? el.host
+            : el.parentNode;
+    }
+
+
+    function _globalDragOver(/**Event*/evt) {
+        if (evt.dataTransfer) {
+            evt.dataTransfer.dropEffect = 'move';
+        }
+        evt.cancelable && evt.preventDefault();
+    }
+
+
+    function _on(el, event, fn) {
+        el.addEventListener(event, fn, captureMode);
+    }
+
+
+    function _off(el, event, fn) {
+        el.removeEventListener(event, fn, captureMode);
+    }
+
+
+    function _toggleClass(el, name, state) {
+        if (el && name) {
+            if (el.classList) {
+                el.classList[state ? 'add' : 'remove'](name);
+            }
+            else {
+                var className = (' ' + el.className + ' ').replace(R_SPACE, ' ').replace(' ' + name + ' ', ' ');
+                el.className = (className + (state ? ' ' + name : '')).replace(R_SPACE, ' ');
+            }
+        }
+    }
+
+
+    function _css(el, prop, val) {
+        var style = el && el.style;
+
+        if (style) {
+            if (val === void 0) {
+                if (document.defaultView && document.defaultView.getComputedStyle) {
+                    val = document.defaultView.getComputedStyle(el, '');
+                }
+                else if (el.currentStyle) {
+                    val = el.currentStyle;
+                }
+
+                return prop === void 0 ? val : val[prop];
+            }
+            else {
+                if (!(prop in style) && prop.indexOf('webkit') === -1) {
+                    prop = '-webkit-' + prop;
+                }
+
+                style[prop] = val + (typeof val === 'string' ? '' : 'px');
+            }
+        }
+    }
+
+    function _matrix(el) {
+        var appliedTransforms = '';
+        do {
+            var transform = _css(el, 'transform');
+
+            if (transform && transform !== 'none') {
+                appliedTransforms = transform + ' ' + appliedTransforms;
+            }
+            /* jshint boss:true */
+        } while (el = el.parentNode);
+
+        if (window.DOMMatrix) {
+            return new DOMMatrix(appliedTransforms);
+        } else if (window.WebKitCSSMatrix) {
+            return new WebKitCSSMatrix(appliedTransforms);
+        } else if (window.CSSMatrix) {
+            return new CSSMatrix(appliedTransforms);
+        }
+    }
+
+
+    function _find(ctx, tagName, iterator) {
+        if (ctx) {
+            var list = ctx.getElementsByTagName(tagName), i = 0, n = list.length;
+
+            if (iterator) {
+                for (; i < n; i++) {
+                    iterator(list[i], i);
+                }
+            }
+
+            return list;
+        }
+
+        return [];
+    }
+
+
+
+    function _dispatchEvent(sortable, rootEl, name, targetEl, toEl, fromEl, startIndex, newIndex, originalEvt) {
+        sortable = (sortable || rootEl[expando]);
+        var evt,
+            options = sortable.options,
+            onName = 'on' + name.charAt(0).toUpperCase() + name.substr(1);
+        // Support for new CustomEvent feature
+        if (window.CustomEvent && !IE11OrLess && !Edge) {
+            evt = new CustomEvent(name, {
+                bubbles: true,
+                cancelable: true
+            });
+        } else {
+            evt = document.createEvent('Event');
+            evt.initEvent(name, true, true);
+        }
+
+        evt.to = toEl || rootEl;
+        evt.from = fromEl || rootEl;
+        evt.item = targetEl || rootEl;
+        evt.clone = cloneEl;
+
+        evt.oldIndex = startIndex;
+        evt.newIndex = newIndex;
+
+        evt.originalEvent = originalEvt;
+
+        if (rootEl) {
+            rootEl.dispatchEvent(evt);
+        }
+
+        if (options[onName]) {
+            options[onName].call(sortable, evt);
+        }
+    }
+
+
+    function _onMove(fromEl, toEl, dragEl, dragRect, targetEl, targetRect, originalEvt, willInsertAfter) {
+        var evt,
+            sortable = fromEl[expando],
+            onMoveFn = sortable.options.onMove,
+            retVal;
+        // Support for new CustomEvent feature
+        if (window.CustomEvent && !IE11OrLess && !Edge) {
+            evt = new CustomEvent('move', {
+                bubbles: true,
+                cancelable: true
+            });
+        } else {
+            evt = document.createEvent('Event');
+            evt.initEvent('move', true, true);
+        }
+
+        evt.to = toEl;
+        evt.from = fromEl;
+        evt.dragged = dragEl;
+        evt.draggedRect = dragRect;
+        evt.related = targetEl || toEl;
+        evt.relatedRect = targetRect || _getRect(toEl);
+        evt.willInsertAfter = willInsertAfter;
+
+        evt.originalEvent = originalEvt;
+
+        fromEl.dispatchEvent(evt);
+
+        if (onMoveFn) {
+            retVal = onMoveFn.call(sortable, evt, originalEvt);
+        }
+
+        return retVal;
+    }
+
+    function _disableDraggable(el) {
+        el.draggable = false;
+    }
+
+    function _unsilent() {
+        _silent = false;
+    }
+
+    /**
+     * Gets nth child of el, ignoring hidden children, sortable's elements (does not ignore clone if it's visible)
+     * and non-draggable elements
+     * @param  {HTMLElement} el       The parent element
+     * @param  {Number} childNum      The index of the child
+     * @param  {Object} options       Parent Sortable's options
+     * @return {HTMLElement}          The child at index childNum, or null if not found
+     */
+    function _getChild(el, childNum, options) {
+        var currentChild = 0,
+            i = 0,
+            children = el.children;
+
+        while (i < children.length) {
+            if (
+                children[i].style.display !== 'none' &&
+                children[i] !== ghostEl &&
+                children[i] !== dragEl &&
+                _closest(children[i], options.draggable, el, false)
+            ) {
+                if (currentChild === childNum) {
+                    return children[i];
+                }
+                currentChild++;
+            }
+
+            i++;
+        }
+        return null;
+    }
+
+    /**
+     * Gets the last child in the el, ignoring ghostEl or invisible elements (clones)
+     * @param  {HTMLElement} el       Parent element
+     * @return {HTMLElement}          The last child, ignoring ghostEl
+     */
+    function _lastChild(el) {
+        var last = el.lastElementChild;
+
+        while (last === ghostEl || last.style.display === 'none') {
+            last = last.previousElementSibling;
+
+            if (!last) break;
+        }
+
+        return last || null;
+    }
+
+    function _ghostIsLast(evt, axis, el) {
+        var elRect = _getRect(_lastChild(el)),
+            mouseOnAxis = axis === 'vertical' ? evt.clientY : evt.clientX,
+            mouseOnOppAxis = axis === 'vertical' ? evt.clientX : evt.clientY,
+            targetS2 = axis === 'vertical' ? elRect.bottom : elRect.right,
+            targetS1Opp = axis === 'vertical' ? elRect.left : elRect.top,
+            targetS2Opp = axis === 'vertical' ? elRect.right : elRect.bottom,
+            spacer = 10;
+
+        return (
+            axis === 'vertical' ?
+                (mouseOnOppAxis > targetS2Opp + spacer || mouseOnOppAxis <= targetS2Opp && mouseOnAxis > targetS2 && mouseOnOppAxis >= targetS1Opp) :
+                (mouseOnAxis > targetS2 && mouseOnOppAxis > targetS1Opp || mouseOnAxis <= targetS2 && mouseOnOppAxis > targetS2Opp + spacer)
+        );
+    }
+
+    function _getSwapDirection(evt, target, axis, swapThreshold, invertedSwapThreshold, invertSwap, isLastTarget) {
+        var targetRect = _getRect(target),
+            mouseOnAxis = axis === 'vertical' ? evt.clientY : evt.clientX,
+            targetLength = axis === 'vertical' ? targetRect.height : targetRect.width,
+            targetS1 = axis === 'vertical' ? targetRect.top : targetRect.left,
+            targetS2 = axis === 'vertical' ? targetRect.bottom : targetRect.right,
+            dragRect = _getRect(dragEl),
+            invert = false;
+
+
+        if (!invertSwap) {
+            // Never invert or create dragEl shadow when target movemenet causes mouse to move past the end of regular swapThreshold
+            if (isLastTarget && targetMoveDistance < targetLength * swapThreshold) { // multiplied only by swapThreshold because mouse will already be inside target by (1 - threshold) * targetLength / 2
+                // check if past first invert threshold on side opposite of lastDirection
+                if (!pastFirstInvertThresh &&
+                    (lastDirection === 1 ?
+                            (
+                                mouseOnAxis > targetS1 + targetLength * invertedSwapThreshold / 2
+                            ) :
+                            (
+                                mouseOnAxis < targetS2 - targetLength * invertedSwapThreshold / 2
+                            )
+                    )
+                )
+                {
+                    // past first invert threshold, do not restrict inverted threshold to dragEl shadow
+                    pastFirstInvertThresh = true;
+                }
+
+                if (!pastFirstInvertThresh) {
+                    var dragS1 = axis === 'vertical' ? dragRect.top : dragRect.left,
+                        dragS2 = axis === 'vertical' ? dragRect.bottom : dragRect.right;
+                    // dragEl shadow (target move distance shadow)
+                    if (
+                        lastDirection === 1 ?
+                            (
+                                mouseOnAxis < targetS1 + targetMoveDistance // over dragEl shadow
+                            ) :
+                            (
+                                mouseOnAxis > targetS2 - targetMoveDistance
+                            )
+                    )
+                    {
+                        return lastDirection * -1;
+                    }
+                } else {
+                    invert = true;
+                }
+            } else {
+                // Regular
+                if (
+                    mouseOnAxis > targetS1 + (targetLength * (1 - swapThreshold) / 2) &&
+                    mouseOnAxis < targetS2 - (targetLength * (1 - swapThreshold) / 2)
+                ) {
+                    return ((mouseOnAxis > targetS1 + targetLength / 2) ? -1 : 1);
+                }
+            }
+        }
+
+        invert = invert || invertSwap;
+
+        if (invert) {
+            // Invert of regular
+            if (
+                mouseOnAxis < targetS1 + (targetLength * invertedSwapThreshold / 2) ||
+                mouseOnAxis > targetS2 - (targetLength * invertedSwapThreshold / 2)
+            )
+            {
+                return ((mouseOnAxis > targetS1 + targetLength / 2) ? 1 : -1);
+            }
+        }
+
+        return 0;
+    }
+
+    /**
+     * Gets the direction dragEl must be swapped relative to target in order to make it
+     * seem that dragEl has been "inserted" into that element's position
+     * @param  {HTMLElement} target       The target whose position dragEl is being inserted at
+     * @param  {Object} options           options of the parent sortable
+     * @return {Number}                   Direction dragEl must be swapped
+     */
+    function _getInsertDirection(target, options) {
+        var dragElIndex = _index(dragEl, options.draggable),
+            targetIndex = _index(target, options.draggable);
+
+        if (dragElIndex < targetIndex) {
+            return 1;
+        } else {
+            return -1;
+        }
+    }
+
+
+    /**
+     * Generate id
+     * @param   {HTMLElement} el
+     * @returns {String}
+     * @private
+     */
+    function _generateId(el) {
+        var str = el.tagName + el.className + el.src + el.href + el.textContent,
+            i = str.length,
+            sum = 0;
+
+        while (i--) {
+            sum += str.charCodeAt(i);
+        }
+
+        return sum.toString(36);
+    }
+
+    /**
+     * Returns the index of an element within its parent for a selected set of
+     * elements
+     * @param  {HTMLElement} el
+     * @param  {selector} selector
+     * @return {number}
+     */
+    function _index(el, selector) {
+        var index = 0;
+
+        if (!el || !el.parentNode) {
+            return -1;
+        }
+
+        while (el && (el = el.previousElementSibling)) {
+            if ((el.nodeName.toUpperCase() !== 'TEMPLATE') && el !== cloneEl) {
+                index++;
+            }
+        }
+
+        return index;
+    }
+
+    function _matches(/**HTMLElement*/el, /**String*/selector) {
+        if (el) {
+            try {
+                if (el.matches) {
+                    return el.matches(selector);
+                } else if (el.msMatchesSelector) {
+                    return el.msMatchesSelector(selector);
+                } else if (el.webkitMatchesSelector) {
+                    return el.webkitMatchesSelector(selector);
+                }
+            } catch(_) {
+                return false;
+            }
+        }
+
+        return false;
+    }
+
+    var _throttleTimeout;
+    function _throttle(callback, ms) {
+        return function () {
+            if (!_throttleTimeout) {
+                var args = arguments,
+                    _this = this;
+
+                _throttleTimeout = setTimeout(function () {
+                    if (args.length === 1) {
+                        callback.call(_this, args[0]);
+                    } else {
+                        callback.apply(_this, args);
+                    }
+
+                    _throttleTimeout = void 0;
+                }, ms);
+            }
+        };
+    }
+
+    function _cancelThrottle() {
+        clearTimeout(_throttleTimeout);
+        _throttleTimeout = void 0;
+    }
+
+    function _extend(dst, src) {
+        if (dst && src) {
+            for (var key in src) {
+                if (src.hasOwnProperty(key)) {
+                    dst[key] = src[key];
+                }
+            }
+        }
+
+        return dst;
+    }
+
+    function _clone(el) {
+        if (Polymer && Polymer.dom) {
+            return Polymer.dom(el).cloneNode(true);
+        }
+        else if ($) {
+            return $(el).clone(true)[0];
+        }
+        else {
+            return el.cloneNode(true);
+        }
+    }
+
+    function _saveInputCheckedState(root) {
+        savedInputChecked.length = 0;
+
+        var inputs = root.getElementsByTagName('input');
+        var idx = inputs.length;
+
+        while (idx--) {
+            var el = inputs[idx];
+            el.checked && savedInputChecked.push(el);
+        }
+    }
+
+    function _nextTick(fn) {
+        return setTimeout(fn, 0);
+    }
+
+    function _cancelNextTick(id) {
+        return clearTimeout(id);
+    }
+
+
+    /**
+     * Returns the "bounding client rect" of given element
+     * @param  {HTMLElement} el                The element whose boundingClientRect is wanted
+     * @param  {[HTMLElement]} container       the parent the element will be placed in
+     * @param  {[Boolean]} adjustForTransform  Whether the rect should compensate for parent's transform
+     * (used for fixed positioning on el)
+     * @return {Object}                        The boundingClientRect of el
+     */
+    function _getRect(el, container, adjustForTransform) {
+        if (!el.getBoundingClientRect && el !== win) return;
+
+        var elRect,
+            top,
+            left,
+            bottom,
+            right,
+            height,
+            width;
+
+        if (el !== win) {
+            elRect = el.getBoundingClientRect();
+            top = elRect.top;
+            left = elRect.left;
+            bottom = elRect.bottom;
+            right = elRect.right;
+            height = elRect.height;
+            width = elRect.width;
+        } else {
+            top = 0;
+            left = 0;
+            bottom = window.innerHeight;
+            right = window.innerWidth;
+            height = window.innerHeight;
+            width = window.innerWidth;
+        }
+
+        if (adjustForTransform && el !== win) {
+            // Adjust for translate()
+            container = container || el.parentNode;
+
+            // solves #1123 (see: https://stackoverflow.com/a/37953806/6088312)
+            // Not needed on <= IE11
+            if (!IE11OrLess) {
+                do {
+                    if (container && container.getBoundingClientRect && _css(container, 'transform') !== 'none') {
+                        var containerRect = container.getBoundingClientRect();
+
+                        // Set relative to edges of padding box of container
+                        top -= containerRect.top + parseInt(_css(container, 'border-top-width'));
+                        left -= containerRect.left + parseInt(_css(container, 'border-left-width'));
+                        bottom = top + elRect.height;
+                        right = left + elRect.width;
+
+                        break;
+                    }
+                    /* jshint boss:true */
+                } while (container = container.parentNode);
+            }
+
+            // Adjust for scale()
+            var matrix = _matrix(el),
+                scaleX = matrix && matrix.a,
+                scaleY = matrix && matrix.d;
+
+            if (matrix) {
+                top /= scaleY;
+                left /= scaleX;
+
+                width /= scaleX;
+                height /= scaleY;
+
+                bottom = top + height;
+                right = left + width;
+            }
+        }
+
+        return {
+            top: top,
+            left: left,
+            bottom: bottom,
+            right: right,
+            width: width,
+            height: height
+        };
+    }
+
+
+    /**
+     * Checks if a side of an element is scrolled past a side of it's parents
+     * @param  {HTMLElement}  el       The element who's side being scrolled out of view is in question
+     * @param  {String}       side     Side of the element in question ('top', 'left', 'right', 'bottom')
+     * @return {Boolean}               Whether the element is overflowing the viewport on the given side of it's parent
+     */
+    function _isScrolledPast(el, side) {
+        var parent = _getParentAutoScrollElement(parent, true),
+            elSide = _getRect(el)[side];
+
+        /* jshint boss:true */
+        while (parent) {
+            var parentSide = _getRect(parent)[side],
+                visible;
+
+            if (side === 'top' || side === 'left') {
+                visible = elSide >= parentSide;
+            } else {
+                visible = elSide <= parentSide;
+            }
+
+            if (!visible) return true;
+
+            if (parent === win) break;
+
+            parent = _getParentAutoScrollElement(parent, false);
+        }
+
+        return false;
+    }
+
+    // Fixed #973:
+    _on(document, 'touchmove', function(evt) {
+        if ((Sortable.active || awaitingDragStarted) && evt.cancelable) {
+            evt.preventDefault();
+        }
+    });
+
+
+    // Export utils
+    Sortable.utils = {
+        on: _on,
+        off: _off,
+        css: _css,
+        find: _find,
+        is: function (el, selector) {
+            return !!_closest(el, selector, el, false);
+        },
+        extend: _extend,
+        throttle: _throttle,
+        closest: _closest,
+        toggleClass: _toggleClass,
+        clone: _clone,
+        index: _index,
+        nextTick: _nextTick,
+        cancelNextTick: _cancelNextTick,
+        detectDirection: _detectDirection,
+        getChild: _getChild
+    };
+
+
+    /**
+     * Create sortable instance
+     * @param {HTMLElement}  el
+     * @param {Object}      [options]
+     */
+    Sortable.create = function (el, options) {
+        return new Sortable(el, options);
+    };
+
+
+    // Export
+    Sortable.version = '1.8.3';
+    return Sortable;
+});
\ No newline at end of file
diff --git a/public/js/vendor/jquery.fn.sortable.js b/public/js/vendor/jquery.fn.sortable.js
new file mode 100644
index 0000000..cd5189a
--- /dev/null
+++ b/public/js/vendor/jquery.fn.sortable.js
@@ -0,0 +1,76 @@
+(function (factory) {
+	"use strict";
+	var sortable,
+		jq,
+		_this = this
+	;
+
+	if (typeof define === "function" && define.amd) {
+		try {
+			define(["sortablejs", "jquery"], function(Sortable, $) {
+				sortable = Sortable;
+				jq = $;
+				checkErrors();
+				factory(Sortable, $);
+			});
+		} catch(err) {
+			checkErrors();
+		}
+		return;
+	} else if (typeof exports === 'object') {
+		try {
+			sortable = require('sortablejs');
+			jq = require('jquery');
+		} catch(err) { }
+	}
+
+	if (typeof jQuery === 'function' || typeof $ === 'function') {
+		jq = jQuery || $;
+	}
+
+	if (typeof Sortable !== 'undefined') {
+		sortable = Sortable;
+	}
+
+	function checkErrors() {
+		if (!jq) {
+			throw new Error('jQuery is required for jquery-sortablejs');
+		}
+
+		if (!sortable) {
+			throw new Error('SortableJS is required for jquery-sortablejs (https://github.com/SortableJS/Sortable)');
+		}
+	}
+	checkErrors();
+	factory(sortable, jq);
+})(function (Sortable, $) {
+	"use strict";
+
+	$.fn.sortable = function (options) {
+		var retVal,
+			args = arguments;
+
+		this.each(function () {
+			var $el = $(this),
+				sortable = $el.data('sortable');
+
+			if (!sortable && (options instanceof Object || !options)) {
+				sortable = new Sortable(this, options);
+				$el.data('sortable', sortable);
+			} else if (sortable) {
+				if (options === 'destroy') {
+					sortable.destroy();
+					$el.removeData('sortable');
+				} else if (options === 'widget') {
+					retVal = sortable;
+				} else if (typeof sortable[options] === 'function') {
+					retVal = sortable[options].apply(sortable, [].slice.call(args, 1));
+				} else if (options in sortable.options) {
+					retVal = sortable.option.apply(sortable, args);
+				}
+			}
+		});
+
+		return (retVal === void 0) ? this : retVal;
+	};
+});
\ No newline at end of file