diff --git a/src/pretix/static/select2/_select2.scss b/src/pretix/static/select2/_select2.scss
index 7ac4f3b933..342344d0c2 100644
--- a/src/pretix/static/select2/_select2.scss
+++ b/src/pretix/static/select2/_select2.scss
@@ -1,5 +1,5 @@
 /*!
- * Select2 4.0.6-rc.1
+ * Select2 4.0.13
  * https://select2.github.io
  *
  * Released under the MIT license
@@ -195,16 +195,13 @@
     width: 100%; }
     .select2-container--default .select2-selection--multiple .select2-selection__rendered li {
       list-style: none; }
-  .select2-container--default .select2-selection--multiple .select2-selection__placeholder {
-    color: #999;
-    margin-top: 5px;
-    float: left; }
   .select2-container--default .select2-selection--multiple .select2-selection__clear {
     cursor: pointer;
     float: right;
     font-weight: bold;
     margin-top: 5px;
-    margin-right: 10px; }
+    margin-right: 10px;
+    padding: 1px; }
   .select2-container--default .select2-selection--multiple .select2-selection__choice {
     background-color: #e4e4e4;
     border: 1px solid #aaa;
@@ -223,7 +220,7 @@
     .select2-container--default .select2-selection--multiple .select2-selection__choice__remove:hover {
       color: #333; }
 
-.select2-container--default[dir="rtl"] .select2-selection--multiple .select2-selection__choice, .select2-container--default[dir="rtl"] .select2-selection--multiple .select2-selection__placeholder, .select2-container--default[dir="rtl"] .select2-selection--multiple .select2-search--inline {
+.select2-container--default[dir="rtl"] .select2-selection--multiple .select2-selection__choice, .select2-container--default[dir="rtl"] .select2-selection--multiple .select2-search--inline {
   float: right; }
 
 .select2-container--default[dir="rtl"] .select2-selection--multiple .select2-selection__choice {
diff --git a/src/pretix/static/select2/select2.js b/src/pretix/static/select2/select2.js
index 73d33af9f4..40e196a2dc 100644
--- a/src/pretix/static/select2/select2.js
+++ b/src/pretix/static/select2/select2.js
@@ -1,5 +1,5 @@
 /*!
- * Select2 4.0.6-rc.1
+ * Select2 4.0.13
  * https://select2.github.io
  *
  * Released under the MIT license
@@ -777,9 +777,9 @@ S2.define('select2/utils',[
 
   var id = 0;
   Utils.GetUniqueElementId = function (element) {
-    // Get a unique element Id. If element has no id, 
-    // creates a new unique number, stores it in the id 
-    // attribute and returns the new id. 
+    // Get a unique element Id. If element has no id,
+    // creates a new unique number, stores it in the id
+    // attribute and returns the new id.
     // If an id already exists, it simply returns it.
 
     var select2Id = element.getAttribute('data-select2-id');
@@ -798,7 +798,7 @@ S2.define('select2/utils',[
 
   Utils.StoreData = function (element, name, value) {
     // Stores an item in the cache for a specified element.
-    // name is the cache key.    
+    // name is the cache key.
     var id = Utils.GetUniqueElementId(element);
     if (!Utils.__cache[id]) {
       Utils.__cache[id] = {};
@@ -809,19 +809,20 @@ S2.define('select2/utils',[
 
   Utils.GetData = function (element, name) {
     // Retrieves a value from the cache by its key (name)
-    // name is optional. If no name specified, return 
+    // name is optional. If no name specified, return
     // all cache items for the specified element.
     // and for a specified element.
     var id = Utils.GetUniqueElementId(element);
     if (name) {
       if (Utils.__cache[id]) {
-        return Utils.__cache[id][name] != null ? 
-	      Utils.__cache[id][name]:
-	      $(element).data(name); // Fallback to HTML5 data attribs.
+        if (Utils.__cache[id][name] != null) {
+          return Utils.__cache[id][name];
+        }
+        return $(element).data(name); // Fallback to HTML5 data attribs.
       }
       return $(element).data(name); // Fallback to HTML5 data attribs.
     } else {
-      return Utils.__cache[id];			   
+      return Utils.__cache[id];
     }
   };
 
@@ -831,6 +832,8 @@ S2.define('select2/utils',[
     if (Utils.__cache[id] != null) {
       delete Utils.__cache[id];
     }
+
+    element.removeAttribute('data-select2-id');
   };
 
   return Utils;
@@ -852,7 +855,7 @@ S2.define('select2/results',[
 
   Results.prototype.render = function () {
     var $results = $(
-      '<ul class="select2-results__options" role="tree"></ul>'
+      '<ul class="select2-results__options" role="listbox"></ul>'
     );
 
     if (this.options.get('multiple')) {
@@ -875,7 +878,7 @@ S2.define('select2/results',[
     this.hideLoading();
 
     var $message = $(
-      '<li role="treeitem" aria-live="assertive"' +
+      '<li role="alert" aria-live="assertive"' +
       ' class="select2-results__option"></li>'
     );
 
@@ -1009,11 +1012,16 @@ S2.define('select2/results',[
     option.className = 'select2-results__option';
 
     var attrs = {
-      'role': 'treeitem',
+      'role': 'option',
       'aria-selected': 'false'
     };
 
-    if (data.disabled) {
+    var matches = window.Element.prototype.matches ||
+      window.Element.prototype.msMatchesSelector ||
+      window.Element.prototype.webkitMatchesSelector;
+
+    if ((data.element != null && matches.call(data.element, ':disabled')) ||
+        (data.element == null && data.disabled)) {
       delete attrs['aria-selected'];
       attrs['aria-disabled'] = 'true';
     }
@@ -1114,7 +1122,10 @@ S2.define('select2/results',[
       }
 
       self.setClasses();
-      self.highlightFirstItem();
+
+      if (self.options.get('scrollAfterSelect')) {
+        self.highlightFirstItem();
+      }
     });
 
     container.on('unselect', function () {
@@ -1123,7 +1134,10 @@ S2.define('select2/results',[
       }
 
       self.setClasses();
-      self.highlightFirstItem();
+
+      if (self.options.get('scrollAfterSelect')) {
+        self.highlightFirstItem();
+      }
     });
 
     container.on('open', function () {
@@ -1177,7 +1191,7 @@ S2.define('select2/results',[
 
       var currentIndex = $options.index($highlighted);
 
-      // If we are already at te top, don't move further
+      // If we are already at the top, don't move further
       // If no options, currentIndex will be -1
       if (currentIndex <= 0) {
         return;
@@ -1418,6 +1432,7 @@ S2.define('select2/selection/base',[
 
     $selection.attr('title', this.$element.attr('title'));
     $selection.attr('tabindex', this._tabindex);
+    $selection.attr('aria-disabled', 'false');
 
     this.$selection = $selection;
 
@@ -1427,7 +1442,6 @@ S2.define('select2/selection/base',[
   BaseSelection.prototype.bind = function (container, $container) {
     var self = this;
 
-    var id = container.id + '-container';
     var resultsId = container.id + '-results';
 
     this.container = container;
@@ -1470,20 +1484,19 @@ S2.define('select2/selection/base',[
       self.$selection.removeAttr('aria-activedescendant');
       self.$selection.removeAttr('aria-owns');
 
-      self.$selection.focus();
-      window.setTimeout(function () {
-        self.$selection.focus();
-      }, 0);
+      self.$selection.trigger('focus');
 
       self._detachCloseHandler(container);
     });
 
     container.on('enable', function () {
       self.$selection.attr('tabindex', self._tabindex);
+      self.$selection.attr('aria-disabled', 'false');
     });
 
     container.on('disable', function () {
       self.$selection.attr('tabindex', '-1');
+      self.$selection.attr('aria-disabled', 'true');
     });
   };
 
@@ -1506,7 +1519,6 @@ S2.define('select2/selection/base',[
   };
 
   BaseSelection.prototype._attachCloseHandler = function (container) {
-    var self = this;
 
     $(document.body).on('mousedown.select2.' + container.id, function (e) {
       var $target = $(e.target);
@@ -1516,8 +1528,6 @@ S2.define('select2/selection/base',[
       var $all = $('.select2.select2-container--open');
 
       $all.each(function () {
-        var $this = $(this);
-
         if (this == $select[0]) {
           return;
         }
@@ -1546,6 +1556,27 @@ S2.define('select2/selection/base',[
     throw new Error('The `update` method must be defined in child classes.');
   };
 
+  /**
+   * Helper method to abstract the "enabled" (not "disabled") state of this
+   * object.
+   *
+   * @return {true} if the instance is not disabled.
+   * @return {false} if the instance is disabled.
+   */
+  BaseSelection.prototype.isEnabled = function () {
+    return !this.isDisabled();
+  };
+
+  /**
+   * Helper method to abstract the "disabled" state of this object.
+   *
+   * @return {true} if the disabled option is true.
+   * @return {false} if the disabled option is false.
+   */
+  BaseSelection.prototype.isDisabled = function () {
+    return this.options.get('disabled');
+  };
+
   return BaseSelection;
 });
 
@@ -1610,7 +1641,7 @@ S2.define('select2/selection/single',[
 
     container.on('focus', function (evt) {
       if (!container.isOpen()) {
-        self.$selection.focus();
+        self.$selection.trigger('focus');
       }
     });
   };
@@ -1644,7 +1675,14 @@ S2.define('select2/selection/single',[
     var formatted = this.display(selection, $rendered);
 
     $rendered.empty().append(formatted);
-    $rendered.attr('title', selection.title || selection.text);
+
+    var title = selection.title || selection.text;
+
+    if (title) {
+      $rendered.attr('title', title);
+    } else {
+      $rendered.removeAttr('title');
+    }
   };
 
   return SingleSelection;
@@ -1689,7 +1727,7 @@ S2.define('select2/selection/multiple',[
       '.select2-selection__choice__remove',
       function (evt) {
         // Ignore the event if it is disabled
-        if (self.options.get('disabled')) {
+        if (self.isDisabled()) {
           return;
         }
 
@@ -1747,7 +1785,12 @@ S2.define('select2/selection/multiple',[
       var formatted = this.display(selection, $selection);
 
       $selection.append(formatted);
-      $selection.attr('title', selection.title || selection.text);
+
+      var title = selection.title || selection.text;
+
+      if (title) {
+        $selection.attr('title', title);
+      }
 
       Utils.StoreData($selection[0], 'data', selection);
 
@@ -1845,7 +1888,7 @@ S2.define('select2/selection/allowClear',[
 
   AllowClear.prototype._handleClear = function (_, evt) {
     // Ignore the event if it is disabled
-    if (this.options.get('disabled')) {
+    if (this.isDisabled()) {
       return;
     }
 
@@ -1888,7 +1931,7 @@ S2.define('select2/selection/allowClear',[
       }
     }
 
-    this.$element.trigger('change');
+    this.$element.trigger('input').trigger('change');
 
     this.trigger('toggle', {});
   };
@@ -1911,8 +1954,10 @@ S2.define('select2/selection/allowClear',[
       return;
     }
 
+    var removeAll = this.options.get('translations').get('removeAllItems');
+
     var $remove = $(
-      '<span class="select2-selection__clear">' +
+      '<span class="select2-selection__clear" title="' + removeAll() +'">' +
         '&times;' +
       '</span>'
     );
@@ -1938,7 +1983,7 @@ S2.define('select2/selection/search',[
       '<li class="select2-search select2-search--inline">' +
         '<input class="select2-search__field" type="search" tabindex="-1"' +
         ' autocomplete="off" autocorrect="off" autocapitalize="none"' +
-        ' spellcheck="false" role="textbox" aria-autocomplete="list" />' +
+        ' spellcheck="false" role="searchbox" aria-autocomplete="list" />' +
       '</li>'
     );
 
@@ -1955,14 +2000,18 @@ S2.define('select2/selection/search',[
   Search.prototype.bind = function (decorated, container, $container) {
     var self = this;
 
+    var resultsId = container.id + '-results';
+
     decorated.call(this, container, $container);
 
     container.on('open', function () {
+      self.$search.attr('aria-controls', resultsId);
       self.$search.trigger('focus');
     });
 
     container.on('close', function () {
       self.$search.val('');
+      self.$search.removeAttr('aria-controls');
       self.$search.removeAttr('aria-activedescendant');
       self.$search.trigger('focus');
     });
@@ -1982,7 +2031,11 @@ S2.define('select2/selection/search',[
     });
 
     container.on('results:focus', function (params) {
-      self.$search.attr('aria-activedescendant', params.id);
+      if (params.data._resultId) {
+        self.$search.attr('aria-activedescendant', params.data._resultId);
+      } else {
+        self.$search.removeAttr('aria-activedescendant');
+      }
     });
 
     this.$selection.on('focusin', '.select2-search--inline', function (evt) {
@@ -2016,6 +2069,12 @@ S2.define('select2/selection/search',[
       }
     });
 
+    this.$selection.on('click', '.select2-search--inline', function (evt) {
+      if (self.$search.val()) {
+        evt.stopPropagation();
+      }
+    });
+
     // Try to detect the IE version should the `documentMode` property that
     // is stored on the document. This is only implemented in IE and is
     // slightly cleaner than doing a user agent check.
@@ -2101,13 +2160,7 @@ S2.define('select2/selection/search',[
 
     this.resizeSearch();
     if (searchHadFocus) {
-      var isTagInput = this.$element.find('[data-select2-tag]').length;
-      if (isTagInput) {
-        // fix IE11 bug where tag input lost focus
-        this.$element.focus();
-      } else {
-        this.$search.focus();
-      }
+      this.$search.trigger('focus');
     }
   };
 
@@ -2140,7 +2193,7 @@ S2.define('select2/selection/search',[
     var width = '';
 
     if (this.$search.attr('placeholder') !== '') {
-      width = this.$selection.find('.select2-selection__rendered').innerWidth();
+      width = this.$selection.find('.select2-selection__rendered').width();
     } else {
       var minimumWidth = this.$search.val().length + 1;
 
@@ -2503,6 +2556,7 @@ S2.define('select2/diacritics',[
     '\u019F': 'O',
     '\uA74A': 'O',
     '\uA74C': 'O',
+    '\u0152': 'OE',
     '\u01A2': 'OI',
     '\uA74E': 'OO',
     '\u0222': 'OU',
@@ -2912,6 +2966,7 @@ S2.define('select2/diacritics',[
     '\uA74B': 'o',
     '\uA74D': 'o',
     '\u0275': 'o',
+    '\u0153': 'oe',
     '\u01A3': 'oi',
     '\u0223': 'ou',
     '\uA74F': 'oo',
@@ -3080,8 +3135,9 @@ S2.define('select2/diacritics',[
     '\u03CD': '\u03C5',
     '\u03CB': '\u03C5',
     '\u03B0': '\u03C5',
-    '\u03C9': '\u03C9',
-    '\u03C2': '\u03C3'
+    '\u03CE': '\u03C9',
+    '\u03C2': '\u03C3',
+    '\u2019': '\''
   };
 
   return diacritics;
@@ -3166,7 +3222,7 @@ S2.define('select2/data/select',[
     if ($(data.element).is('option')) {
       data.element.selected = true;
 
-      this.$element.trigger('change');
+      this.$element.trigger('input').trigger('change');
 
       return;
     }
@@ -3187,13 +3243,13 @@ S2.define('select2/data/select',[
         }
 
         self.$element.val(val);
-        self.$element.trigger('change');
+        self.$element.trigger('input').trigger('change');
       });
     } else {
       var val = data.id;
 
       this.$element.val(val);
-      this.$element.trigger('change');
+      this.$element.trigger('input').trigger('change');
     }
   };
 
@@ -3209,7 +3265,7 @@ S2.define('select2/data/select',[
     if ($(data.element).is('option')) {
       data.element.selected = false;
 
-      this.$element.trigger('change');
+      this.$element.trigger('input').trigger('change');
 
       return;
     }
@@ -3227,7 +3283,7 @@ S2.define('select2/data/select',[
 
       self.$element.val(val);
 
-      self.$element.trigger('change');
+      self.$element.trigger('input').trigger('change');
     });
   };
 
@@ -3420,15 +3476,19 @@ S2.define('select2/data/array',[
   'jquery'
 ], function (SelectAdapter, Utils, $) {
   function ArrayAdapter ($element, options) {
-    var data = options.get('data') || [];
+    this._dataToConvert = options.get('data') || [];
 
     ArrayAdapter.__super__.constructor.call(this, $element, options);
-
-    this.addOptions(this.convertToOptions(data));
   }
 
   Utils.Extend(ArrayAdapter, SelectAdapter);
 
+  ArrayAdapter.prototype.bind = function (container, $container) {
+    ArrayAdapter.__super__.bind.call(this, container, $container);
+
+    this.addOptions(this.convertToOptions(this._dataToConvert));
+  };
+
   ArrayAdapter.prototype.select = function (data) {
     var $option = this.$element.find('option').filter(function (i, elm) {
       return elm.value == data.id.toString();
@@ -3718,8 +3778,6 @@ S2.define('select2/data/tags',[
   };
 
   Tags.prototype._removeOldTags = function (_) {
-    var tag = this._lastTag;
-
     var $options = this.$element.find('option[data-select2-tag]');
 
     $options.each(function () {
@@ -3794,7 +3852,7 @@ S2.define('select2/data/tokenizer',[
       // Replace the search term if we have the search box
       if (this.$search.length) {
         this.$search.val(tokenData.term);
-        this.$search.focus();
+        this.$search.trigger('focus');
       }
 
       params.term = tokenData.term;
@@ -3923,10 +3981,30 @@ S2.define('select2/data/maximumSelectionLength',[
     decorated.call(this, $e, options);
   }
 
+  MaximumSelectionLength.prototype.bind =
+    function (decorated, container, $container) {
+      var self = this;
+
+      decorated.call(this, container, $container);
+
+      container.on('select', function () {
+        self._checkIfMaximumSelected();
+      });
+  };
+
   MaximumSelectionLength.prototype.query =
     function (decorated, params, callback) {
       var self = this;
 
+      this._checkIfMaximumSelected(function () {
+        decorated.call(self, params, callback);
+      });
+  };
+
+  MaximumSelectionLength.prototype._checkIfMaximumSelected =
+    function (_, successCallback) {
+      var self = this;
+
       this.current(function (currentData) {
         var count = currentData != null ? currentData.length : 0;
         if (self.maximumSelectionLength > 0 &&
@@ -3939,7 +4017,10 @@ S2.define('select2/data/maximumSelectionLength',[
           });
           return;
         }
-        decorated.call(self, params, callback);
+
+        if (successCallback) {
+          successCallback();
+        }
       });
   };
 
@@ -3978,7 +4059,7 @@ S2.define('select2/dropdown',[
   };
 
   Dropdown.prototype.position = function ($dropdown, $container) {
-    // Should be implmented in subclasses
+    // Should be implemented in subclasses
   };
 
   Dropdown.prototype.destroy = function () {
@@ -4002,7 +4083,7 @@ S2.define('select2/dropdown/search',[
       '<span class="select2-search select2-search--dropdown">' +
         '<input class="select2-search__field" type="search" tabindex="-1"' +
         ' autocomplete="off" autocorrect="off" autocapitalize="none"' +
-        ' spellcheck="false" role="textbox" />' +
+        ' spellcheck="false" role="searchbox" aria-autocomplete="list" />' +
       '</span>'
     );
 
@@ -4017,6 +4098,8 @@ S2.define('select2/dropdown/search',[
   Search.prototype.bind = function (decorated, container, $container) {
     var self = this;
 
+    var resultsId = container.id + '-results';
+
     decorated.call(this, container, $container);
 
     this.$search.on('keydown', function (evt) {
@@ -4039,24 +4122,27 @@ S2.define('select2/dropdown/search',[
 
     container.on('open', function () {
       self.$search.attr('tabindex', 0);
+      self.$search.attr('aria-controls', resultsId);
 
-      self.$search.focus();
+      self.$search.trigger('focus');
 
       window.setTimeout(function () {
-        self.$search.focus();
+        self.$search.trigger('focus');
       }, 0);
     });
 
     container.on('close', function () {
       self.$search.attr('tabindex', -1);
+      self.$search.removeAttr('aria-controls');
+      self.$search.removeAttr('aria-activedescendant');
 
       self.$search.val('');
-      self.$search.blur();
+      self.$search.trigger('blur');
     });
 
     container.on('focus', function () {
       if (!container.isOpen()) {
-        self.$search.focus();
+        self.$search.trigger('focus');
       }
     });
 
@@ -4071,6 +4157,14 @@ S2.define('select2/dropdown/search',[
         }
       }
     });
+
+    container.on('results:focus', function (params) {
+      if (params.data._resultId) {
+        self.$search.attr('aria-activedescendant', params.data._resultId);
+      } else {
+        self.$search.removeAttr('aria-activedescendant');
+      }
+    });
   };
 
   Search.prototype.handleSearch = function (evt) {
@@ -4155,6 +4249,7 @@ S2.define('select2/dropdown/infiniteScroll',[
 
     if (this.showLoadingMore(data)) {
       this.$results.append(this.$loadingMore);
+      this.loadMoreIfNeeded();
     }
   };
 
@@ -4173,25 +4268,27 @@ S2.define('select2/dropdown/infiniteScroll',[
       self.loading = true;
     });
 
-    this.$results.on('scroll', function () {
-      var isLoadMoreVisible = $.contains(
-        document.documentElement,
-        self.$loadingMore[0]
-      );
+    this.$results.on('scroll', this.loadMoreIfNeeded.bind(this));
+  };
 
-      if (self.loading || !isLoadMoreVisible) {
-        return;
-      }
+  InfiniteScroll.prototype.loadMoreIfNeeded = function () {
+    var isLoadMoreVisible = $.contains(
+      document.documentElement,
+      this.$loadingMore[0]
+    );
 
-      var currentOffset = self.$results.offset().top +
-        self.$results.outerHeight(false);
-      var loadingMoreOffset = self.$loadingMore.offset().top +
-        self.$loadingMore.outerHeight(false);
+    if (this.loading || !isLoadMoreVisible) {
+      return;
+    }
 
-      if (currentOffset + 50 >= loadingMoreOffset) {
-        self.loadMore();
-      }
-    });
+    var currentOffset = this.$results.offset().top +
+      this.$results.outerHeight(false);
+    var loadingMoreOffset = this.$loadingMore.offset().top +
+      this.$loadingMore.outerHeight(false);
+
+    if (currentOffset + 50 >= loadingMoreOffset) {
+      this.loadMore();
+    }
   };
 
   InfiniteScroll.prototype.loadMore = function () {
@@ -4212,7 +4309,7 @@ S2.define('select2/dropdown/infiniteScroll',[
     var $option = $(
       '<li ' +
       'class="select2-results__option select2-results__option--load-more"' +
-      'role="treeitem" aria-disabled="true"></li>'
+      'role="option" aria-disabled="true"></li>'
     );
 
     var message = this.options.get('translations').get('loadingMore');
@@ -4230,7 +4327,7 @@ S2.define('select2/dropdown/attachBody',[
   '../utils'
 ], function ($, Utils) {
   function AttachBody (decorated, $element, options) {
-    this.$dropdownParent = options.get('dropdownParent') || $(document.body);
+    this.$dropdownParent = $(options.get('dropdownParent') || document.body);
 
     decorated.call(this, $element, options);
   }
@@ -4238,27 +4335,14 @@ S2.define('select2/dropdown/attachBody',[
   AttachBody.prototype.bind = function (decorated, container, $container) {
     var self = this;
 
-    var setupResultsEvents = false;
-
     decorated.call(this, container, $container);
 
     container.on('open', function () {
       self._showDropdown();
       self._attachPositioningHandler(container);
 
-      if (!setupResultsEvents) {
-        setupResultsEvents = true;
-
-        container.on('results:all', function () {
-          self._positionDropdown();
-          self._resizeDropdown();
-        });
-
-        container.on('results:append', function () {
-          self._positionDropdown();
-          self._resizeDropdown();
-        });
-      }
+      // Must bind after the results handlers to ensure correct sizing
+      self._bindContainerResultHandlers(container);
     });
 
     container.on('close', function () {
@@ -4307,6 +4391,44 @@ S2.define('select2/dropdown/attachBody',[
     this.$dropdownContainer.detach();
   };
 
+  AttachBody.prototype._bindContainerResultHandlers =
+      function (decorated, container) {
+
+    // These should only be bound once
+    if (this._containerResultsHandlersBound) {
+      return;
+    }
+
+    var self = this;
+
+    container.on('results:all', function () {
+      self._positionDropdown();
+      self._resizeDropdown();
+    });
+
+    container.on('results:append', function () {
+      self._positionDropdown();
+      self._resizeDropdown();
+    });
+
+    container.on('results:message', function () {
+      self._positionDropdown();
+      self._resizeDropdown();
+    });
+
+    container.on('select', function () {
+      self._positionDropdown();
+      self._resizeDropdown();
+    });
+
+    container.on('unselect', function () {
+      self._positionDropdown();
+      self._resizeDropdown();
+    });
+
+    this._containerResultsHandlersBound = true;
+  };
+
   AttachBody.prototype._attachPositioningHandler =
       function (decorated, container) {
     var self = this;
@@ -4383,16 +4505,26 @@ S2.define('select2/dropdown/attachBody',[
       top: container.bottom
     };
 
-    // Determine what the parent element is to use for calciulating the offset
+    // Determine what the parent element is to use for calculating the offset
     var $offsetParent = this.$dropdownParent;
 
-    // For statically positoned elements, we need to get the element
+    // For statically positioned elements, we need to get the element
     // that is determining the offset
     if ($offsetParent.css('position') === 'static') {
       $offsetParent = $offsetParent.offsetParent();
     }
 
-    var parentOffset = $offsetParent.offset();
+    var parentOffset = {
+      top: 0,
+      left: 0
+    };
+
+    if (
+      $.contains(document.body, $offsetParent[0]) ||
+      $offsetParent[0].isConnected
+      ) {
+      parentOffset = $offsetParent.offset();
+    }
 
     css.top -= parentOffset.top;
     css.left -= parentOffset.left;
@@ -4562,7 +4694,7 @@ S2.define('select2/dropdown/closeOnSelect',[
     var originalEvent = evt.originalEvent;
 
     // Don't close if the control key is being held
-    if (originalEvent && originalEvent.ctrlKey) {
+    if (originalEvent && (originalEvent.ctrlKey || originalEvent.metaKey)) {
       return;
     }
 
@@ -4616,6 +4748,9 @@ S2.define('select2/i18n/en',[],function () {
     },
     searching: function () {
       return 'Searching…';
+    },
+    removeAllItems: function () {
+      return 'Remove all items';
     }
   };
 });
@@ -4854,66 +4989,29 @@ S2.define('select2/defaults',[
       );
     }
 
-    if (typeof options.language === 'string') {
-      // Check if the language is specified with a region
-      if (options.language.indexOf('-') > 0) {
-        // Extract the region information if it is included
-        var languageParts = options.language.split('-');
-        var baseLanguage = languageParts[0];
+    // If the defaults were not previously applied from an element, it is
+    // possible for the language option to have not been resolved
+    options.language = this._resolveLanguage(options.language);
 
-        options.language = [options.language, baseLanguage];
-      } else {
-        options.language = [options.language];
+    // Always fall back to English since it will always be complete
+    options.language.push('en');
+
+    var uniqueLanguages = [];
+
+    for (var l = 0; l < options.language.length; l++) {
+      var language = options.language[l];
+
+      if (uniqueLanguages.indexOf(language) === -1) {
+        uniqueLanguages.push(language);
       }
     }
 
-    if ($.isArray(options.language)) {
-      var languages = new Translation();
-      options.language.push('en');
+    options.language = uniqueLanguages;
 
-      var languageNames = options.language;
-
-      for (var l = 0; l < languageNames.length; l++) {
-        var name = languageNames[l];
-        var language = {};
-
-        try {
-          // Try to load it with the original name
-          language = Translation.loadPath(name);
-        } catch (e) {
-          try {
-            // If we couldn't load it, check if it wasn't the full path
-            name = this.defaults.amdLanguageBase + name;
-            language = Translation.loadPath(name);
-          } catch (ex) {
-            // The translation could not be loaded at all. Sometimes this is
-            // because of a configuration problem, other times this can be
-            // because of how Select2 helps load all possible translation files.
-            if (options.debug && window.console && console.warn) {
-              console.warn(
-                'Select2: The language file for "' + name + '" could not be ' +
-                'automatically loaded. A fallback will be used instead.'
-              );
-            }
-
-            continue;
-          }
-        }
-
-        languages.extend(language);
-      }
-
-      options.translations = languages;
-    } else {
-      var baseTranslation = Translation.loadPath(
-        this.defaults.amdLanguageBase + 'en'
-      );
-      var customTranslation = new Translation(options.language);
-
-      customTranslation.extend(baseTranslation);
-
-      options.translations = customTranslation;
-    }
+    options.translations = this._processTranslations(
+      options.language,
+      options.debug
+    );
 
     return options;
   };
@@ -4980,13 +5078,14 @@ S2.define('select2/defaults',[
       debug: false,
       dropdownAutoWidth: false,
       escapeMarkup: Utils.escapeMarkup,
-      language: EnglishTranslation,
+      language: {},
       matcher: matcher,
       minimumInputLength: 0,
       maximumInputLength: 0,
       maximumSelectionLength: 0,
       minimumResultsForSearch: 0,
       selectOnClose: false,
+      scrollAfterSelect: false,
       sorter: function (data) {
         return data;
       },
@@ -5001,6 +5100,103 @@ S2.define('select2/defaults',[
     };
   };
 
+  Defaults.prototype.applyFromElement = function (options, $element) {
+    var optionLanguage = options.language;
+    var defaultLanguage = this.defaults.language;
+    var elementLanguage = $element.prop('lang');
+    var parentLanguage = $element.closest('[lang]').prop('lang');
+
+    var languages = Array.prototype.concat.call(
+      this._resolveLanguage(elementLanguage),
+      this._resolveLanguage(optionLanguage),
+      this._resolveLanguage(defaultLanguage),
+      this._resolveLanguage(parentLanguage)
+    );
+
+    options.language = languages;
+
+    return options;
+  };
+
+  Defaults.prototype._resolveLanguage = function (language) {
+    if (!language) {
+      return [];
+    }
+
+    if ($.isEmptyObject(language)) {
+      return [];
+    }
+
+    if ($.isPlainObject(language)) {
+      return [language];
+    }
+
+    var languages;
+
+    if (!$.isArray(language)) {
+      languages = [language];
+    } else {
+      languages = language;
+    }
+
+    var resolvedLanguages = [];
+
+    for (var l = 0; l < languages.length; l++) {
+      resolvedLanguages.push(languages[l]);
+
+      if (typeof languages[l] === 'string' && languages[l].indexOf('-') > 0) {
+        // Extract the region information if it is included
+        var languageParts = languages[l].split('-');
+        var baseLanguage = languageParts[0];
+
+        resolvedLanguages.push(baseLanguage);
+      }
+    }
+
+    return resolvedLanguages;
+  };
+
+  Defaults.prototype._processTranslations = function (languages, debug) {
+    var translations = new Translation();
+
+    for (var l = 0; l < languages.length; l++) {
+      var languageData = new Translation();
+
+      var language = languages[l];
+
+      if (typeof language === 'string') {
+        try {
+          // Try to load it with the original name
+          languageData = Translation.loadPath(language);
+        } catch (e) {
+          try {
+            // If we couldn't load it, check if it wasn't the full path
+            language = this.defaults.amdLanguageBase + language;
+            languageData = Translation.loadPath(language);
+          } catch (ex) {
+            // The translation could not be loaded at all. Sometimes this is
+            // because of a configuration problem, other times this can be
+            // because of how Select2 helps load all possible translation files
+            if (debug && window.console && console.warn) {
+              console.warn(
+                'Select2: The language file for "' + language + '" could ' +
+                'not be automatically loaded. A fallback will be used instead.'
+              );
+            }
+          }
+        }
+      } else if ($.isPlainObject(language)) {
+        languageData = new Translation(language);
+      } else {
+        languageData = language;
+      }
+
+      translations.extend(languageData);
+    }
+
+    return translations;
+  };
+
   Defaults.prototype.set = function (key, value) {
     var camelKey = $.camelCase(key);
 
@@ -5030,6 +5226,10 @@ S2.define('select2/options',[
       this.fromElement($element);
     }
 
+    if ($element != null) {
+      this.options = Defaults.applyFromElement(this.options, $element);
+    }
+
     this.options = Defaults.apply(this.options);
 
     if ($element && $element.is('input')) {
@@ -5053,14 +5253,6 @@ S2.define('select2/options',[
       this.options.disabled = $e.prop('disabled');
     }
 
-    if (this.options.language == null) {
-      if ($e.prop('lang')) {
-        this.options.language = $e.prop('lang').toLowerCase();
-      } else if ($e.closest('[lang]').prop('lang')) {
-        this.options.language = $e.closest('[lang]').prop('lang');
-      }
-    }
-
     if (this.options.dir == null) {
       if ($e.prop('dir')) {
         this.options.dir = $e.prop('dir');
@@ -5098,20 +5290,43 @@ S2.define('select2/options',[
 
       $e.attr('ajax--url', Utils.GetData($e[0], 'ajaxUrl'));
       Utils.StoreData($e[0], 'ajax-Url', Utils.GetData($e[0], 'ajaxUrl'));
-	  
     }
 
     var dataset = {};
 
+    function upperCaseLetter(_, letter) {
+      return letter.toUpperCase();
+    }
+
+    // Pre-load all of the attributes which are prefixed with `data-`
+    for (var attr = 0; attr < $e[0].attributes.length; attr++) {
+      var attributeName = $e[0].attributes[attr].name;
+      var prefix = 'data-';
+
+      if (attributeName.substr(0, prefix.length) == prefix) {
+        // Get the contents of the attribute after `data-`
+        var dataName = attributeName.substring(prefix.length);
+
+        // Get the data contents from the consistent source
+        // This is more than likely the jQuery data helper
+        var dataValue = Utils.GetData($e[0], dataName);
+
+        // camelCase the attribute name to match the spec
+        var camelDataName = dataName.replace(/-([a-z])/g, upperCaseLetter);
+
+        // Store the data attribute contents into the dataset since
+        dataset[camelDataName] = dataValue;
+      }
+    }
+
     // Prefer the element's `dataset` attribute if it exists
     // jQuery 1.x does not correctly handle data attributes with multiple dashes
     if ($.fn.jquery && $.fn.jquery.substr(0, 2) == '1.' && $e[0].dataset) {
-      dataset = $.extend(true, {}, $e[0].dataset, Utils.GetData($e[0]));
-    } else {
-      dataset = Utils.GetData($e[0]);
+      dataset = $.extend(true, {}, $e[0].dataset, dataset);
     }
 
-    var data = $.extend(true, {}, dataset);
+    // Prefer our internal data cache if it exists
+    var data = $.extend(true, {}, Utils.GetData($e[0]), dataset);
 
     data = Utils._convertData(data);
 
@@ -5305,6 +5520,12 @@ S2.define('select2/core',[
       return null;
     }
 
+    if (method == 'computedstyle') {
+      var computedStyle = window.getComputedStyle($element[0]);
+
+      return computedStyle.width;
+    }
+
     return method;
   };
 
@@ -5345,8 +5566,8 @@ S2.define('select2/core',[
 
     if (observer != null) {
       this._observer = new observer(function (mutations) {
-        $.each(mutations, self._syncA);
-        $.each(mutations, self._syncS);
+        self._syncA();
+        self._syncS(null, mutations);
       });
       this._observer.observe(this.$element[0], {
         attributes: true,
@@ -5468,7 +5689,7 @@ S2.define('select2/core',[
       if (self.isOpen()) {
         if (key === KEYS.ESC || key === KEYS.TAB ||
             (key === KEYS.UP && evt.altKey)) {
-          self.close();
+          self.close(evt);
 
           evt.preventDefault();
         } else if (key === KEYS.ENTER) {
@@ -5502,7 +5723,7 @@ S2.define('select2/core',[
   Select2.prototype._syncAttributes = function () {
     this.options.set('disabled', this.$element.prop('disabled'));
 
-    if (this.options.get('disabled')) {
+    if (this.isDisabled()) {
       if (this.isOpen()) {
         this.close();
       }
@@ -5513,7 +5734,7 @@ S2.define('select2/core',[
     }
   };
 
-  Select2.prototype._syncSubtree = function (evt, mutations) {
+  Select2.prototype._isChangeMutation = function (evt, mutations) {
     var changed = false;
     var self = this;
 
@@ -5541,7 +5762,22 @@ S2.define('select2/core',[
       }
     } else if (mutations.removedNodes && mutations.removedNodes.length > 0) {
       changed = true;
+    } else if ($.isArray(mutations)) {
+      $.each(mutations, function(evt, mutation) {
+        if (self._isChangeMutation(evt, mutation)) {
+          // We've found a change mutation.
+          // Let's escape from the loop and continue
+          changed = true;
+          return false;
+        }
+      });
     }
+    return changed;
+  };
+
+  Select2.prototype._syncSubtree = function (evt, mutations) {
+    var changed = this._isChangeMutation(evt, mutations);
+    var self = this;
 
     // Only re-pull the data if we think there is a change
     if (changed) {
@@ -5592,7 +5828,7 @@ S2.define('select2/core',[
   };
 
   Select2.prototype.toggleDropdown = function () {
-    if (this.options.get('disabled')) {
+    if (this.isDisabled()) {
       return;
     }
 
@@ -5608,15 +5844,40 @@ S2.define('select2/core',[
       return;
     }
 
+    if (this.isDisabled()) {
+      return;
+    }
+
     this.trigger('query', {});
   };
 
-  Select2.prototype.close = function () {
+  Select2.prototype.close = function (evt) {
     if (!this.isOpen()) {
       return;
     }
 
-    this.trigger('close', {});
+    this.trigger('close', { originalEvent : evt });
+  };
+
+  /**
+   * Helper method to abstract the "enabled" (not "disabled") state of this
+   * object.
+   *
+   * @return {true} if the instance is not disabled.
+   * @return {false} if the instance is disabled.
+   */
+  Select2.prototype.isEnabled = function () {
+    return !this.isDisabled();
+  };
+
+  /**
+   * Helper method to abstract the "disabled" state of this object.
+   *
+   * @return {true} if the disabled option is true.
+   * @return {false} if the disabled option is false.
+   */
+  Select2.prototype.isDisabled = function () {
+    return this.options.get('disabled');
   };
 
   Select2.prototype.isOpen = function () {
@@ -5693,7 +5954,7 @@ S2.define('select2/core',[
       });
     }
 
-    this.$element.val(newVal).trigger('change');
+    this.$element.val(newVal).trigger('input').trigger('change');
   };
 
   Select2.prototype.destroy = function () {
@@ -5844,4 +6105,4 @@ S2.define('jquery.select2',[
 
   // Return the Select2 instance for anyone who is importing it.
   return select2;
-}));
+}));
\ No newline at end of file