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diff --git a/addons/web/static/lib/jquery.mjs.nestedSortable/jquery.mjs.nestedSortable.js b/addons/web/static/lib/jquery.mjs.nestedSortable/jquery.mjs.nestedSortable.js
new file mode 100644
index 00000000..bdde6b9d
--- /dev/null
+++ b/addons/web/static/lib/jquery.mjs.nestedSortable/jquery.mjs.nestedSortable.js
@@ -0,0 +1,907 @@
+/*
+ * jQuery UI Nested Sortable
+ * v 2.1a / 2016-02-04
+ * https://github.com/ilikenwf/nestedSortable
+ *
+ * Depends on:
+ *	 jquery.ui.sortable.js 1.10+
+ *
+ * Copyright (c) 2010-2016 Manuele J Sarfatti and contributors
+ * Licensed under the MIT License
+ * http://www.opensource.org/licenses/mit-license.php
+ */
+(function( factory ) {
+	"use strict";
+
+	if ( typeof define === "function" && define.amd ) {
+
+		// AMD. Register as an anonymous module.
+		define([
+			"jquery",
+			"jquery-ui/sortable"
+		], factory );
+	} else {
+
+		// Browser globals
+		factory( window.jQuery );
+	}
+}(function($) {
+	"use strict";
+
+	function isOverAxis( x, reference, size ) {
+		return ( x > reference ) && ( x < ( reference + size ) );
+	}
+
+	$.widget("mjs.nestedSortable", $.extend({}, $.ui.sortable.prototype, {
+
+		options: {
+			disableParentChange: false,
+			doNotClear: false,
+			expandOnHover: 700,
+			isAllowed: function() { return true; },
+			isTree: false,
+			listType: "ol",
+			maxLevels: 0,
+			protectRoot: false,
+			rootID: null,
+			rtl: false,
+			startCollapsed: false,
+			tabSize: 20,
+
+			branchClass: "mjs-nestedSortable-branch",
+			collapsedClass: "mjs-nestedSortable-collapsed",
+			disableNestingClass: "mjs-nestedSortable-no-nesting",
+			errorClass: "mjs-nestedSortable-error",
+			expandedClass: "mjs-nestedSortable-expanded",
+			hoveringClass: "mjs-nestedSortable-hovering",
+			leafClass: "mjs-nestedSortable-leaf",
+			disabledClass: "mjs-nestedSortable-disabled"
+		},
+
+		_create: function() {
+			var self = this,
+				err;
+
+			this.element.data("ui-sortable", this.element.data("mjs-nestedSortable"));
+
+			// mjs - prevent browser from freezing if the HTML is not correct
+			if (!this.element.is(this.options.listType)) {
+				err = "nestedSortable: " +
+					"Please check that the listType option is set to your actual list type";
+
+				throw new Error(err);
+			}
+
+			// if we have a tree with expanding/collapsing functionality,
+			// force 'intersect' tolerance method
+			if (this.options.isTree && this.options.expandOnHover) {
+				this.options.tolerance = "intersect";
+			}
+
+			$.ui.sortable.prototype._create.apply(this, arguments);
+
+			// prepare the tree by applying the right classes
+			// (the CSS is responsible for actual hide/show functionality)
+			if (this.options.isTree) {
+				$(this.items).each(function() {
+					var $li = this.item,
+						hasCollapsedClass = $li.hasClass(self.options.collapsedClass),
+						hasExpandedClass = $li.hasClass(self.options.expandedClass);
+
+					if ($li.children(self.options.listType).length) {
+						$li.addClass(self.options.branchClass);
+						// expand/collapse class only if they have children
+
+						if ( !hasCollapsedClass && !hasExpandedClass ) {
+							if (self.options.startCollapsed) {
+								$li.addClass(self.options.collapsedClass);
+							} else {
+								$li.addClass(self.options.expandedClass);
+							}
+						}
+					} else {
+						$li.addClass(self.options.leafClass);
+					}
+				});
+			}
+		},
+
+		_destroy: function() {
+			this.element
+				.removeData("mjs-nestedSortable")
+				.removeData("ui-sortable");
+			return $.ui.sortable.prototype._destroy.apply(this, arguments);
+		},
+
+		_mouseDrag: function(event) {
+			var i,
+				item,
+				itemElement,
+				intersection,
+				self = this,
+				o = this.options,
+				scrolled = false,
+				$document = $(document),
+				previousTopOffset,
+				parentItem,
+				level,
+				childLevels,
+				itemAfter,
+				itemBefore,
+				newList,
+				method,
+				a,
+				previousItem,
+				nextItem,
+				helperIsNotSibling;
+
+			//Compute the helpers position
+			this.position = this._generatePosition(event);
+			this.positionAbs = this._convertPositionTo("absolute");
+
+			if (!this.lastPositionAbs) {
+				this.lastPositionAbs = this.positionAbs;
+			}
+
+			//Do scrolling
+			if (this.options.scroll) {
+				if (this.scrollParent[0] !== document && this.scrollParent[0].tagName !== "HTML") {
+
+					if (
+						(
+							this.overflowOffset.top +
+							this.scrollParent[0].offsetHeight
+						) -
+						event.pageY <
+						o.scrollSensitivity
+					) {
+						scrolled = this.scrollParent.scrollTop() + o.scrollSpeed;
+						this.scrollParent.scrollTop(scrolled);
+					} else if (
+						event.pageY -
+						this.overflowOffset.top <
+						o.scrollSensitivity
+					) {
+						scrolled = this.scrollParent.scrollTop() - o.scrollSpeed;
+						this.scrollParent.scrollTop(scrolled);
+					}
+
+					if (
+						(
+							this.overflowOffset.left +
+							this.scrollParent[0].offsetWidth
+						) -
+						event.pageX <
+						o.scrollSensitivity
+					) {
+						scrolled = this.scrollParent.scrollLeft() + o.scrollSpeed;
+						this.scrollParent.scrollLeft(scrolled);
+					} else if (
+						event.pageX -
+						this.overflowOffset.left <
+						o.scrollSensitivity
+					) {
+						scrolled = this.scrollParent.scrollLeft() - o.scrollSpeed;
+						this.scrollParent.scrollLeft(scrolled);
+					}
+
+				} else {
+
+					if (
+						event.pageY -
+						$document.scrollTop() <
+						o.scrollSensitivity
+					) {
+						scrolled = $document.scrollTop() - o.scrollSpeed;
+						$document.scrollTop(scrolled);
+					} else if (
+						$(window).height() -
+						(
+							event.pageY -
+							$document.scrollTop()
+						) <
+						o.scrollSensitivity
+					) {
+						scrolled = $document.scrollTop() + o.scrollSpeed;
+						$document.scrollTop(scrolled);
+					}
+
+					if (
+						event.pageX -
+						$document.scrollLeft() <
+						o.scrollSensitivity
+					) {
+						scrolled = $document.scrollLeft() - o.scrollSpeed;
+						$document.scrollLeft(scrolled);
+					} else if (
+						$(window).width() -
+						(
+							event.pageX -
+							$document.scrollLeft()
+						) <
+						o.scrollSensitivity
+					) {
+						scrolled = $document.scrollLeft() + o.scrollSpeed;
+						$document.scrollLeft(scrolled);
+					}
+
+				}
+
+				if (scrolled !== false && $.ui.ddmanager && !o.dropBehaviour) {
+					$.ui.ddmanager.prepareOffsets(this, event);
+				}
+			}
+
+			//Regenerate the absolute position used for position checks
+			this.positionAbs = this._convertPositionTo("absolute");
+
+			// mjs - find the top offset before rearrangement,
+			previousTopOffset = this.placeholder.offset().top;
+
+			//Set the helper position
+			if (!this.options.axis || this.options.axis !== "y") {
+				this.helper[0].style.left = this.position.left + "px";
+			}
+			if (!this.options.axis || this.options.axis !== "x") {
+				this.helper[0].style.top = (this.position.top) + "px";
+			}
+
+			// mjs - check and reset hovering state at each cycle
+			this.hovering = this.hovering ? this.hovering : null;
+			this.mouseentered = this.mouseentered ? this.mouseentered : false;
+
+			// mjs - let's start caching some variables
+			(function() {
+				var _parentItem = this.placeholder.parent().parent();
+				if (_parentItem && _parentItem.closest(".ui-sortable").length) {
+					parentItem = _parentItem;
+				}
+			}.call(this));
+
+			level = this._getLevel(this.placeholder);
+			childLevels = this._getChildLevels(this.helper);
+			newList = document.createElement(o.listType);
+
+			//Rearrange
+			for (i = this.items.length - 1; i >= 0; i--) {
+
+				//Cache variables and intersection, continue if no intersection
+				item = this.items[i];
+				itemElement = item.item[0];
+				intersection = this._intersectsWithPointer(item);
+				if (!intersection) {
+					continue;
+				}
+
+				// Only put the placeholder inside the current Container, skip all
+				// items form other containers. This works because when moving
+				// an item from one container to another the
+				// currentContainer is switched before the placeholder is moved.
+				//
+				// Without this moving items in "sub-sortables" can cause the placeholder to jitter
+				// beetween the outer and inner container.
+				if (item.instance !== this.currentContainer) {
+					continue;
+				}
+
+				// No action if intersected item is disabled
+				// and the element above or below in the direction we're going is also disabled
+				if (itemElement.className.indexOf(o.disabledClass) !== -1) {
+					// Note: intersection hardcoded direction values from
+					// jquery.ui.sortable.js:_intersectsWithPointer
+					if (intersection === 2) {
+						// Going down
+						itemAfter = this.items[i + 1];
+						if (itemAfter && itemAfter.item.hasClass(o.disabledClass)) {
+							continue;
+						}
+
+					} else if (intersection === 1) {
+						// Going up
+						itemBefore = this.items[i - 1];
+						if (itemBefore && itemBefore.item.hasClass(o.disabledClass)) {
+							continue;
+						}
+					}
+				}
+
+				method = intersection === 1 ? "next" : "prev";
+
+				// cannot intersect with itself
+				// no useless actions that have been done before
+				// no action if the item moved is the parent of the item checked
+				if (itemElement !== this.currentItem[0] &&
+					this.placeholder[method]()[0] !== itemElement &&
+					!$.contains(this.placeholder[0], itemElement) &&
+					(
+						this.options.type === "semi-dynamic" ?
+							!$.contains(this.element[0], itemElement) :
+							true
+					)
+				) {
+
+					// mjs - we are intersecting an element:
+					// trigger the mouseenter event and store this state
+					if (!this.mouseentered) {
+						$(itemElement).mouseenter();
+						this.mouseentered = true;
+					}
+
+					// mjs - if the element has children and they are hidden,
+					// show them after a delay (CSS responsible)
+					if (o.isTree && $(itemElement).hasClass(o.collapsedClass) && o.expandOnHover) {
+						if (!this.hovering) {
+							$(itemElement).addClass(o.hoveringClass);
+							this.hovering = window.setTimeout(function() {
+								$(itemElement)
+									.removeClass(o.collapsedClass)
+									.addClass(o.expandedClass);
+
+								self.refreshPositions();
+								self._trigger("expand", event, self._uiHash());
+							}, o.expandOnHover);
+						}
+					}
+
+					this.direction = intersection === 1 ? "down" : "up";
+
+					// mjs - rearrange the elements and reset timeouts and hovering state
+					if (this.options.tolerance === "pointer" || this._intersectsWithSides(item)) {
+						$(itemElement).mouseleave();
+						this.mouseentered = false;
+						$(itemElement).removeClass(o.hoveringClass);
+						if (this.hovering) {
+							window.clearTimeout(this.hovering);
+						}
+						this.hovering = null;
+
+						// mjs - do not switch container if
+						// it's a root item and 'protectRoot' is true
+						// or if it's not a root item but we are trying to make it root
+						if (o.protectRoot &&
+							!(
+								this.currentItem[0].parentNode === this.element[0] &&
+								// it's a root item
+								itemElement.parentNode !== this.element[0]
+								// it's intersecting a non-root item
+							)
+						) {
+							if (this.currentItem[0].parentNode !== this.element[0] &&
+								itemElement.parentNode === this.element[0]
+							) {
+
+								if ( !$(itemElement).children(o.listType).length) {
+									itemElement.appendChild(newList);
+									if (o.isTree) {
+										$(itemElement)
+											.removeClass(o.leafClass)
+											.addClass(o.branchClass + " " + o.expandedClass);
+									}
+								}
+
+								if (this.direction === "down") {
+									a = $(itemElement).prev().children(o.listType);
+								} else {
+									a = $(itemElement).children(o.listType);
+								}
+
+								if (a[0] !== undefined) {
+									this._rearrange(event, null, a);
+								}
+
+							} else {
+								this._rearrange(event, item);
+							}
+						} else if (!o.protectRoot) {
+							this._rearrange(event, item);
+						}
+					} else {
+						break;
+					}
+
+					// Clear emtpy ul's/ol's
+					this._clearEmpty(itemElement);
+
+					this._trigger("change", event, this._uiHash());
+					break;
+				}
+			}
+
+			// mjs - to find the previous sibling in the list,
+			// keep backtracking until we hit a valid list item.
+			(function() {
+				var _previousItem = this.placeholder.prev();
+				if (_previousItem.length) {
+					previousItem = _previousItem;
+				} else {
+					previousItem = null;
+				}
+			}.call(this));
+
+			if (previousItem != null) {
+				while (
+					previousItem[0].nodeName.toLowerCase() !== "li" ||
+					previousItem[0].className.indexOf(o.disabledClass) !== -1 ||
+					previousItem[0] === this.currentItem[0] ||
+					previousItem[0] === this.helper[0]
+				) {
+					if (previousItem[0].previousSibling) {
+						previousItem = $(previousItem[0].previousSibling);
+					} else {
+						previousItem = null;
+						break;
+					}
+				}
+			}
+
+			// mjs - to find the next sibling in the list,
+			// keep stepping forward until we hit a valid list item.
+			(function() {
+				var _nextItem = this.placeholder.next();
+				if (_nextItem.length) {
+					nextItem = _nextItem;
+				} else {
+					nextItem = null;
+				}
+			}.call(this));
+
+			if (nextItem != null) {
+				while (
+					nextItem[0].nodeName.toLowerCase() !== "li" ||
+					nextItem[0].className.indexOf(o.disabledClass) !== -1 ||
+					nextItem[0] === this.currentItem[0] ||
+					nextItem[0] === this.helper[0]
+				) {
+					if (nextItem[0].nextSibling) {
+						nextItem = $(nextItem[0].nextSibling);
+					} else {
+						nextItem = null;
+						break;
+					}
+				}
+			}
+
+			this.beyondMaxLevels = 0;
+
+			// mjs - if the item is moved to the left, send it one level up
+			// but only if it's at the bottom of the list
+			if (parentItem != null &&
+				nextItem == null &&
+				!(o.protectRoot && parentItem[0].parentNode == this.element[0]) &&
+				(
+					o.rtl &&
+					(
+						this.positionAbs.left +
+						this.helper.outerWidth() > parentItem.offset().left +
+						parentItem.outerWidth()
+					) ||
+					!o.rtl && (this.positionAbs.left < parentItem.offset().left)
+				)
+			) {
+
+				parentItem.after(this.placeholder[0]);
+				helperIsNotSibling = !parentItem
+											.children(o.listItem)
+											.children("li:visible:not(.ui-sortable-helper)")
+											.length;
+				if (o.isTree && helperIsNotSibling) {
+					parentItem
+						.removeClass(this.options.branchClass + " " + this.options.expandedClass)
+						.addClass(this.options.leafClass);
+				}
+                if(typeof parentItem !== 'undefined')
+				    this._clearEmpty(parentItem[0]);
+				this._trigger("change", event, this._uiHash());
+				// mjs - if the item is below a sibling and is moved to the right,
+				// make it a child of that sibling
+			} else if (previousItem != null &&
+				!previousItem.hasClass(o.disableNestingClass) &&
+				(
+					previousItem.children(o.listType).length &&
+					previousItem.children(o.listType).is(":visible") ||
+					!previousItem.children(o.listType).length
+				) &&
+				!(o.protectRoot && this.currentItem[0].parentNode === this.element[0]) &&
+				(
+					o.rtl &&
+					(
+						this.positionAbs.left +
+						this.helper.outerWidth() <
+						previousItem.offset().left +
+						previousItem.outerWidth() -
+						o.tabSize
+					) ||
+					!o.rtl &&
+					(this.positionAbs.left > previousItem.offset().left + o.tabSize)
+				)
+			) {
+
+				this._isAllowed(previousItem, level, level + childLevels + 1);
+
+				if (!previousItem.children(o.listType).length) {
+					previousItem[0].appendChild(newList);
+					if (o.isTree) {
+						previousItem
+							.removeClass(o.leafClass)
+							.addClass(o.branchClass + " " + o.expandedClass);
+					}
+				}
+
+				// mjs - if this item is being moved from the top, add it to the top of the list.
+				if (previousTopOffset && (previousTopOffset <= previousItem.offset().top)) {
+					previousItem.children(o.listType).prepend(this.placeholder);
+				} else {
+					// mjs - otherwise, add it to the bottom of the list.
+					previousItem.children(o.listType)[0].appendChild(this.placeholder[0]);
+				}
+                if(typeof parentItem !== 'undefined')
+				    this._clearEmpty(parentItem[0]);
+				this._trigger("change", event, this._uiHash());
+			} else {
+				this._isAllowed(parentItem, level, level + childLevels);
+			}
+
+			//Post events to containers
+			this._contactContainers(event);
+
+			//Interconnect with droppables
+			if ($.ui.ddmanager) {
+				$.ui.ddmanager.drag(this, event);
+			}
+
+			//Call callbacks
+			this._trigger("sort", event, this._uiHash());
+
+			this.lastPositionAbs = this.positionAbs;
+			return false;
+
+		},
+
+		_mouseStop: function(event) {
+			// mjs - if the item is in a position not allowed, send it back
+			if (this.beyondMaxLevels) {
+
+				this.placeholder.removeClass(this.options.errorClass);
+
+				if (this.domPosition.prev) {
+					$(this.domPosition.prev).after(this.placeholder);
+				} else {
+					$(this.domPosition.parent).prepend(this.placeholder);
+				}
+
+				this._trigger("revert", event, this._uiHash());
+
+			}
+
+			// mjs - clear the hovering timeout, just to be sure
+			$("." + this.options.hoveringClass)
+				.mouseleave()
+				.removeClass(this.options.hoveringClass);
+
+			this.mouseentered = false;
+			if (this.hovering) {
+				window.clearTimeout(this.hovering);
+			}
+			this.hovering = null;
+
+			this._relocate_event = event;
+			this._pid_current = $(this.domPosition.parent).parent().attr("id");
+			this._sort_current = this.domPosition.prev ? $(this.domPosition.prev).next().index() : 0;
+			$.ui.sortable.prototype._mouseStop.apply(this, arguments); //asybnchronous execution, @see _clear for the relocate event.
+		},
+
+		// mjs - this function is slightly modified
+		// to make it easier to hover over a collapsed element and have it expand
+		_intersectsWithSides: function(item) {
+
+			var half = this.options.isTree ? .8 : .5,
+				isOverBottomHalf = isOverAxis(
+					this.positionAbs.top + this.offset.click.top,
+					item.top + (item.height * half),
+					item.height
+				),
+				isOverTopHalf = isOverAxis(
+					this.positionAbs.top + this.offset.click.top,
+					item.top - (item.height * half),
+					item.height
+				),
+				isOverRightHalf = isOverAxis(
+					this.positionAbs.left + this.offset.click.left,
+					item.left + (item.width / 2),
+					item.width
+				),
+				verticalDirection = this._getDragVerticalDirection(),
+				horizontalDirection = this._getDragHorizontalDirection();
+
+			if (this.floating && horizontalDirection) {
+				return (
+					(horizontalDirection === "right" && isOverRightHalf) ||
+					(horizontalDirection === "left" && !isOverRightHalf)
+				);
+			} else {
+				return verticalDirection && (
+					(verticalDirection === "down" && isOverBottomHalf) ||
+					(verticalDirection === "up" && isOverTopHalf)
+				);
+			}
+
+		},
+
+		_contactContainers: function() {
+
+			if (this.options.protectRoot && this.currentItem[0].parentNode === this.element[0] ) {
+				return;
+			}
+
+			$.ui.sortable.prototype._contactContainers.apply(this, arguments);
+
+		},
+
+		_clear: function() {
+			var i,
+				item;
+
+			$.ui.sortable.prototype._clear.apply(this, arguments);
+
+			//relocate event
+			if (!(this._pid_current === this._uiHash().item.parent().parent().attr("id") &&
+				this._sort_current === this._uiHash().item.index())) {
+				this._trigger("relocate", this._relocate_event, this._uiHash());
+			}
+
+			// mjs - clean last empty ul/ol
+			for (i = this.items.length - 1; i >= 0; i--) {
+				item = this.items[i].item[0];
+				this._clearEmpty(item);
+			}
+
+		},
+
+		serialize: function(options) {
+
+			var o = $.extend({}, this.options, options),
+				items = this._getItemsAsjQuery(o && o.connected),
+				str = [];
+
+			$(items).each(function() {
+				var res = ($(o.item || this).attr(o.attribute || "id") || "")
+						.match(o.expression || (/(.+)[-=_](.+)/)),
+					pid = ($(o.item || this).parent(o.listType)
+						.parent(o.items)
+						.attr(o.attribute || "id") || "")
+						.match(o.expression || (/(.+)[-=_](.+)/));
+
+				if (res) {
+					str.push(
+						(
+							(o.key || res[1]) +
+							"[" +
+							(o.key && o.expression ? res[1] : res[2]) + "]"
+						) +
+						"=" +
+						(pid ? (o.key && o.expression ? pid[1] : pid[2]) : o.rootID));
+				}
+			});
+
+			if (!str.length && o.key) {
+				str.push(o.key + "=");
+			}
+
+			return str.join("&");
+
+		},
+
+		toHierarchy: function(options) {
+
+			var o = $.extend({}, this.options, options),
+				ret = [];
+
+			$(this.element).children(o.items).each(function() {
+				var level = _recursiveItems(this);
+				ret.push(level);
+			});
+
+			return ret;
+
+			function _recursiveItems(item) {
+				var id = ($(item).attr(o.attribute || "id") || "").match(o.expression || (/(.+)[-=_](.+)/)),
+					currentItem;
+
+				var data = $(item).data();
+				if (data.nestedSortableItem) {
+					delete data.nestedSortableItem; // Remove the nestedSortableItem object from the data
+				}
+
+				if (id) {
+					currentItem = {
+						"id": id[2]
+					};
+
+					currentItem = $.extend({}, currentItem, data); // Combine the two objects
+
+					if ($(item).children(o.listType).children(o.items).length > 0) {
+						currentItem.children = [];
+						$(item).children(o.listType).children(o.items).each(function() {
+							var level = _recursiveItems(this);
+							currentItem.children.push(level);
+						});
+					}
+					return currentItem;
+				}
+			}
+		},
+
+		toArray: function(options) {
+
+			var o = $.extend({}, this.options, options),
+				sDepth = o.startDepthCount || 0,
+				ret = [],
+				left = 1;
+
+			if (!o.excludeRoot) {
+				ret.push({
+					"item_id": o.rootID,
+					"parent_id": null,
+					"depth": sDepth,
+					"left": left,
+					"right": ($(o.items, this.element).length + 1) * 2
+				});
+				left++;
+			}
+
+			$(this.element).children(o.items).each(function() {
+				left = _recursiveArray(this, sDepth, left);
+			});
+
+			ret = ret.sort(function(a, b) { return (a.left - b.left); });
+
+			return ret;
+
+			function _recursiveArray(item, depth, _left) {
+
+				var right = _left + 1,
+					id,
+					pid,
+					parentItem;
+
+				if ($(item).children(o.listType).children(o.items).length > 0) {
+					depth++;
+					$(item).children(o.listType).children(o.items).each(function() {
+						right = _recursiveArray($(this), depth, right);
+					});
+					depth--;
+				}
+
+				id = ($(item).attr(o.attribute || "id")).match(o.expression || (/(.+)[-=_](.+)/));
+
+				if (depth === sDepth) {
+					pid = o.rootID;
+				} else {
+					parentItem = ($(item).parent(o.listType)
+											.parent(o.items)
+											.attr(o.attribute || "id"))
+											.match(o.expression || (/(.+)[-=_](.+)/));
+					pid = parentItem[2];
+				}
+
+				if (id) {
+					var data = $(item).children('div').data();
+					var itemObj = $.extend( data, {
+						"id":id[2],
+						"parent_id":pid,
+						"depth":depth,
+						"left":_left,
+						"right":right
+						} );
+					ret.push( itemObj );
+				}
+
+				_left = right + 1;
+				return _left;
+			}
+
+		},
+
+		_clearEmpty: function (item) {
+			function replaceClass(elem, search, replace, swap) {
+				if (swap) {
+					search = [replace, replace = search][0];
+				}
+
+				$(elem).removeClass(search).addClass(replace);
+			}
+
+			var o = this.options,
+				childrenList = $(item).children(o.listType),
+				hasChildren = childrenList.has('li').length;
+
+			var doNotClear =
+				o.doNotClear ||
+				hasChildren ||
+				o.protectRoot && $(item)[0] === this.element[0];
+
+			if (o.isTree) {
+				replaceClass(item, o.branchClass, o.leafClass, doNotClear);
+			}
+
+			if (!doNotClear) {
+				childrenList.parent().removeClass(o.expandedClass);
+				childrenList.remove();
+			}
+		},
+
+		_getLevel: function(item) {
+
+			var level = 1,
+				list;
+
+			if (this.options.listType) {
+				list = item.closest(this.options.listType);
+				while (list && list.length > 0 && !list.is(".ui-sortable")) {
+					level++;
+					list = list.parent().closest(this.options.listType);
+				}
+			}
+
+			return level;
+		},
+
+		_getChildLevels: function(parent, depth) {
+			var self = this,
+				o = this.options,
+				result = 0;
+			depth = depth || 0;
+
+			$(parent).children(o.listType).children(o.items).each(function(index, child) {
+				result = Math.max(self._getChildLevels(child, depth + 1), result);
+			});
+
+			return depth ? result + 1 : result;
+		},
+
+		_isAllowed: function(parentItem, level, levels) {
+			var o = this.options,
+				// this takes into account the maxLevels set to the recipient list
+				maxLevels = this
+					.placeholder
+					.closest(".ui-sortable")
+					.nestedSortable("option", "maxLevels"),
+
+				// Check if the parent has changed to prevent it, when o.disableParentChange is true
+				oldParent = this.currentItem.parent().parent(),
+				disabledByParentchange = o.disableParentChange && (
+					//From somewhere to somewhere else, except the root
+					typeof parentItem !== 'undefined' && !oldParent.is(parentItem) ||
+					typeof parentItem === 'undefined' && oldParent.is("li")	//From somewhere to the root
+				);
+			// mjs - is the root protected?
+			// mjs - are we nesting too deep?
+			if (
+				disabledByParentchange ||
+				!o.isAllowed(this.placeholder, parentItem, this.currentItem)
+			) {
+				this.placeholder.addClass(o.errorClass);
+				if (maxLevels < levels && maxLevels !== 0) {
+					this.beyondMaxLevels = levels - maxLevels;
+				} else {
+					this.beyondMaxLevels = 1;
+				}
+			} else {
+				if (maxLevels < levels && maxLevels !== 0) {
+					this.placeholder.addClass(o.errorClass);
+					this.beyondMaxLevels = levels - maxLevels;
+				} else {
+					this.placeholder.removeClass(o.errorClass);
+					this.beyondMaxLevels = 0;
+				}
+			}
+		}
+
+	}));
+
+	$.mjs.nestedSortable.prototype.options = $.extend(
+		{},
+		$.ui.sortable.prototype.options,
+		$.mjs.nestedSortable.prototype.options
+	);
+}));
\ No newline at end of file