From ad94b6faba806719efbb2d85249f9f17c09e0bcd Mon Sep 17 00:00:00 2001
From: Kevin Brown <kevin@kevinbrown.in>
Date: Fri, 2 Jan 2015 20:32:14 -0500
Subject: [PATCH] Added jQuery.mousewheel support

jQuery.mousewheel will allow us to prevent the dropdown from
automatically closing when the user scrolls to the end of the list.
It is automatically bundled in the full versions of Select2 and
we don't require that it is included in order for Select2 to work.

jQuery.mousewheel was taken directly from the source repository
using the commit at

https://github.com/jquery/jquery-mousewheel/commit/cc2c5d73ae7d4edea655d71476c1258d02297cfb
---
 Gruntfile.js                |   7 +-
 dist/js/select2.amd.full.js | 257 +++++++++++++++++++++++++++++++++++-
 dist/js/select2.amd.js      |  35 ++++-
 dist/js/select2.full.js     | 257 +++++++++++++++++++++++++++++++++++-
 dist/js/select2.full.min.js |   6 +-
 dist/js/select2.js          |  35 ++++-
 dist/js/select2.min.js      |   4 +-
 src/js/jquery.select2.js    |   5 +
 src/js/select2/results.js   |  32 ++++-
 vendor/jquery.mousewheel.js | 221 +++++++++++++++++++++++++++++++
 10 files changed, 847 insertions(+), 12 deletions(-)
 create mode 100644 vendor/jquery.mousewheel.js

diff --git a/Gruntfile.js b/Gruntfile.js
index 262e5b83..86e2218f 100644
--- a/Gruntfile.js
+++ b/Gruntfile.js
@@ -10,6 +10,7 @@ module.exports = function (grunt) {
 
   fullIncludes = [
     'jquery',
+    'jquery.mousewheel',
 
     'select2/compat/matcher',
 
@@ -144,7 +145,8 @@ module.exports = function (grunt) {
           include: amdIncludes.concat(fullIncludes),
           paths: {
             almond: '../../vendor/almond-0.2.9',
-            jquery: '../../vendor/jquery-2.1.0'
+            jquery: '../../vendor/jquery-2.1.0',
+            'jquery.mousewheel': '../../vendor/jquery.mousewheel'
           },
           wrap: grunt.file.readJSON('src/js/banner.json')
         }
@@ -170,7 +172,8 @@ module.exports = function (grunt) {
           out: 'dist/js/select2.amd.full.js',
           include: fullIncludes,
           paths: {
-            jquery: 'empty:'
+            jquery: 'empty:',
+            'jquery.mousewheel': '../../vendor/jquery.mousewheel'
           },
           wrap: grunt.file.readJSON('src/js/banner.json')
         }
diff --git a/dist/js/select2.amd.full.js b/dist/js/select2.amd.full.js
index 4f6ab10e..7b1cf71d 100644
--- a/dist/js/select2.amd.full.js
+++ b/dist/js/select2.amd.full.js
@@ -163,8 +163,9 @@ window.$ = window.$ || {};(function() { if ($ && $.fn && $.fn.select2 && $.fn.se
 });
 
 define('select2/results',[
+  'jquery',
   './utils'
-], function (Utils) {
+], function ($, Utils) {
   function Results ($element, options, dataAdapter) {
     this.$element = $element;
     this.data = dataAdapter;
@@ -530,6 +531,33 @@ define('select2/results',[
       self.displayMessage(params);
     });
 
+    if ($.fn.mousewheel) {
+      this.$results.on('mousewheel', function (e) {
+        var top = self.$results.scrollTop();
+
+        var bottom = (
+          self.$results.get(0).scrollHeight -
+          self.$results.scrollTop() +
+          e.deltaY
+        );
+
+        var isAtTop = e.deltaY > 0 && top - e.deltaY <= 0;
+        var isAtBottom = e.deltaY < 0 && bottom <= self.$results.height();
+
+        if (isAtTop) {
+          self.$results.scrollTop(0);
+          e.preventDefault();
+          e.stopPropagation();
+        } else if (isAtBottom) {
+          self.$results.scrollTop(
+            self.$results.get(0).scrollHeight - self.$results.height()
+          );
+          e.preventDefault();
+          e.stopPropagation();
+        }
+      });
+    }
+
     this.$results.on('mouseup', '.select2-results__option[aria-selected]',
       function (evt) {
       var $this = $(this);
@@ -4001,6 +4029,228 @@ define('select2/core',[
   return Select2;
 });
 
+/*!
+ * jQuery Mousewheel 3.1.12
+ *
+ * Copyright 2014 jQuery Foundation and other contributors
+ * Released under the MIT license.
+ * http://jquery.org/license
+ */
+
+(function (factory) {
+    if ( typeof define === 'function' && define.amd ) {
+        // AMD. Register as an anonymous module.
+        define('jquery.mousewheel',['jquery'], factory);
+    } else if (typeof exports === 'object') {
+        // Node/CommonJS style for Browserify
+        module.exports = factory;
+    } else {
+        // Browser globals
+        factory(jQuery);
+    }
+}(function ($) {
+
+    var toFix  = ['wheel', 'mousewheel', 'DOMMouseScroll', 'MozMousePixelScroll'],
+        toBind = ( 'onwheel' in document || document.documentMode >= 9 ) ?
+                    ['wheel'] : ['mousewheel', 'DomMouseScroll', 'MozMousePixelScroll'],
+        slice  = Array.prototype.slice,
+        nullLowestDeltaTimeout, lowestDelta;
+
+    if ( $.event.fixHooks ) {
+        for ( var i = toFix.length; i; ) {
+            $.event.fixHooks[ toFix[--i] ] = $.event.mouseHooks;
+        }
+    }
+
+    var special = $.event.special.mousewheel = {
+        version: '3.1.12',
+
+        setup: function() {
+            if ( this.addEventListener ) {
+                for ( var i = toBind.length; i; ) {
+                    this.addEventListener( toBind[--i], handler, false );
+                }
+            } else {
+                this.onmousewheel = handler;
+            }
+            // Store the line height and page height for this particular element
+            $.data(this, 'mousewheel-line-height', special.getLineHeight(this));
+            $.data(this, 'mousewheel-page-height', special.getPageHeight(this));
+        },
+
+        teardown: function() {
+            if ( this.removeEventListener ) {
+                for ( var i = toBind.length; i; ) {
+                    this.removeEventListener( toBind[--i], handler, false );
+                }
+            } else {
+                this.onmousewheel = null;
+            }
+            // Clean up the data we added to the element
+            $.removeData(this, 'mousewheel-line-height');
+            $.removeData(this, 'mousewheel-page-height');
+        },
+
+        getLineHeight: function(elem) {
+            var $elem = $(elem),
+                $parent = $elem['offsetParent' in $.fn ? 'offsetParent' : 'parent']();
+            if (!$parent.length) {
+                $parent = $('body');
+            }
+            return parseInt($parent.css('fontSize'), 10) || parseInt($elem.css('fontSize'), 10) || 16;
+        },
+
+        getPageHeight: function(elem) {
+            return $(elem).height();
+        },
+
+        settings: {
+            adjustOldDeltas: true, // see shouldAdjustOldDeltas() below
+            normalizeOffset: true  // calls getBoundingClientRect for each event
+        }
+    };
+
+    $.fn.extend({
+        mousewheel: function(fn) {
+            return fn ? this.bind('mousewheel', fn) : this.trigger('mousewheel');
+        },
+
+        unmousewheel: function(fn) {
+            return this.unbind('mousewheel', fn);
+        }
+    });
+
+
+    function handler(event) {
+        var orgEvent   = event || window.event,
+            args       = slice.call(arguments, 1),
+            delta      = 0,
+            deltaX     = 0,
+            deltaY     = 0,
+            absDelta   = 0,
+            offsetX    = 0,
+            offsetY    = 0;
+        event = $.event.fix(orgEvent);
+        event.type = 'mousewheel';
+
+        // Old school scrollwheel delta
+        if ( 'detail'      in orgEvent ) { deltaY = orgEvent.detail * -1;      }
+        if ( 'wheelDelta'  in orgEvent ) { deltaY = orgEvent.wheelDelta;       }
+        if ( 'wheelDeltaY' in orgEvent ) { deltaY = orgEvent.wheelDeltaY;      }
+        if ( 'wheelDeltaX' in orgEvent ) { deltaX = orgEvent.wheelDeltaX * -1; }
+
+        // Firefox < 17 horizontal scrolling related to DOMMouseScroll event
+        if ( 'axis' in orgEvent && orgEvent.axis === orgEvent.HORIZONTAL_AXIS ) {
+            deltaX = deltaY * -1;
+            deltaY = 0;
+        }
+
+        // Set delta to be deltaY or deltaX if deltaY is 0 for backwards compatabilitiy
+        delta = deltaY === 0 ? deltaX : deltaY;
+
+        // New school wheel delta (wheel event)
+        if ( 'deltaY' in orgEvent ) {
+            deltaY = orgEvent.deltaY * -1;
+            delta  = deltaY;
+        }
+        if ( 'deltaX' in orgEvent ) {
+            deltaX = orgEvent.deltaX;
+            if ( deltaY === 0 ) { delta  = deltaX * -1; }
+        }
+
+        // No change actually happened, no reason to go any further
+        if ( deltaY === 0 && deltaX === 0 ) { return; }
+
+        // Need to convert lines and pages to pixels if we aren't already in pixels
+        // There are three delta modes:
+        //   * deltaMode 0 is by pixels, nothing to do
+        //   * deltaMode 1 is by lines
+        //   * deltaMode 2 is by pages
+        if ( orgEvent.deltaMode === 1 ) {
+            var lineHeight = $.data(this, 'mousewheel-line-height');
+            delta  *= lineHeight;
+            deltaY *= lineHeight;
+            deltaX *= lineHeight;
+        } else if ( orgEvent.deltaMode === 2 ) {
+            var pageHeight = $.data(this, 'mousewheel-page-height');
+            delta  *= pageHeight;
+            deltaY *= pageHeight;
+            deltaX *= pageHeight;
+        }
+
+        // Store lowest absolute delta to normalize the delta values
+        absDelta = Math.max( Math.abs(deltaY), Math.abs(deltaX) );
+
+        if ( !lowestDelta || absDelta < lowestDelta ) {
+            lowestDelta = absDelta;
+
+            // Adjust older deltas if necessary
+            if ( shouldAdjustOldDeltas(orgEvent, absDelta) ) {
+                lowestDelta /= 40;
+            }
+        }
+
+        // Adjust older deltas if necessary
+        if ( shouldAdjustOldDeltas(orgEvent, absDelta) ) {
+            // Divide all the things by 40!
+            delta  /= 40;
+            deltaX /= 40;
+            deltaY /= 40;
+        }
+
+        // Get a whole, normalized value for the deltas
+        delta  = Math[ delta  >= 1 ? 'floor' : 'ceil' ](delta  / lowestDelta);
+        deltaX = Math[ deltaX >= 1 ? 'floor' : 'ceil' ](deltaX / lowestDelta);
+        deltaY = Math[ deltaY >= 1 ? 'floor' : 'ceil' ](deltaY / lowestDelta);
+
+        // Normalise offsetX and offsetY properties
+        if ( special.settings.normalizeOffset && this.getBoundingClientRect ) {
+            var boundingRect = this.getBoundingClientRect();
+            offsetX = event.clientX - boundingRect.left;
+            offsetY = event.clientY - boundingRect.top;
+        }
+
+        // Add information to the event object
+        event.deltaX = deltaX;
+        event.deltaY = deltaY;
+        event.deltaFactor = lowestDelta;
+        event.offsetX = offsetX;
+        event.offsetY = offsetY;
+        // Go ahead and set deltaMode to 0 since we converted to pixels
+        // Although this is a little odd since we overwrite the deltaX/Y
+        // properties with normalized deltas.
+        event.deltaMode = 0;
+
+        // Add event and delta to the front of the arguments
+        args.unshift(event, delta, deltaX, deltaY);
+
+        // Clearout lowestDelta after sometime to better
+        // handle multiple device types that give different
+        // a different lowestDelta
+        // Ex: trackpad = 3 and mouse wheel = 120
+        if (nullLowestDeltaTimeout) { clearTimeout(nullLowestDeltaTimeout); }
+        nullLowestDeltaTimeout = setTimeout(nullLowestDelta, 200);
+
+        return ($.event.dispatch || $.event.handle).apply(this, args);
+    }
+
+    function nullLowestDelta() {
+        lowestDelta = null;
+    }
+
+    function shouldAdjustOldDeltas(orgEvent, absDelta) {
+        // If this is an older event and the delta is divisable by 120,
+        // then we are assuming that the browser is treating this as an
+        // older mouse wheel event and that we should divide the deltas
+        // by 40 to try and get a more usable deltaFactor.
+        // Side note, this actually impacts the reported scroll distance
+        // in older browsers and can cause scrolling to be slower than native.
+        // Turn this off by setting $.event.special.mousewheel.settings.adjustOldDeltas to false.
+        return special.settings.adjustOldDeltas && orgEvent.type === 'mousewheel' && absDelta % 120 === 0;
+    }
+
+}));
+
 define('select2/compat/matcher',[
 
 ], function () {
@@ -4067,6 +4317,11 @@ define('jquery.select2',[
   'jquery',
   'select2/core'
 ], function ($, Select2) {
+  // Force jQuery.mousewheel to be loaded if it hasn't already
+  try {
+    require('jquery.mousewheel');
+  } catch (Exception) { }
+
   if ($.fn.select2 == null) {
     $.fn.select2 = function (options) {
       options = options || {};
diff --git a/dist/js/select2.amd.js b/dist/js/select2.amd.js
index db0b9343..cbb8e867 100644
--- a/dist/js/select2.amd.js
+++ b/dist/js/select2.amd.js
@@ -163,8 +163,9 @@ window.$ = window.$ || {};(function() { if ($ && $.fn && $.fn.select2 && $.fn.se
 });
 
 define('select2/results',[
+  'jquery',
   './utils'
-], function (Utils) {
+], function ($, Utils) {
   function Results ($element, options, dataAdapter) {
     this.$element = $element;
     this.data = dataAdapter;
@@ -530,6 +531,33 @@ define('select2/results',[
       self.displayMessage(params);
     });
 
+    if ($.fn.mousewheel) {
+      this.$results.on('mousewheel', function (e) {
+        var top = self.$results.scrollTop();
+
+        var bottom = (
+          self.$results.get(0).scrollHeight -
+          self.$results.scrollTop() +
+          e.deltaY
+        );
+
+        var isAtTop = e.deltaY > 0 && top - e.deltaY <= 0;
+        var isAtBottom = e.deltaY < 0 && bottom <= self.$results.height();
+
+        if (isAtTop) {
+          self.$results.scrollTop(0);
+          e.preventDefault();
+          e.stopPropagation();
+        } else if (isAtBottom) {
+          self.$results.scrollTop(
+            self.$results.get(0).scrollHeight - self.$results.height()
+          );
+          e.preventDefault();
+          e.stopPropagation();
+        }
+      });
+    }
+
     this.$results.on('mouseup', '.select2-results__option[aria-selected]',
       function (evt) {
       var $this = $(this);
@@ -4005,6 +4033,11 @@ define('jquery.select2',[
   'jquery',
   'select2/core'
 ], function ($, Select2) {
+  // Force jQuery.mousewheel to be loaded if it hasn't already
+  try {
+    require('jquery.mousewheel');
+  } catch (Exception) { }
+
   if ($.fn.select2 == null) {
     $.fn.select2 = function (options) {
       options = options || {};
diff --git a/dist/js/select2.full.js b/dist/js/select2.full.js
index 653b67d3..98b69754 100644
--- a/dist/js/select2.full.js
+++ b/dist/js/select2.full.js
@@ -9698,8 +9698,9 @@ define('select2/utils',[], function () {
 });
 
 define('select2/results',[
+  'jquery',
   './utils'
-], function (Utils) {
+], function ($, Utils) {
   function Results ($element, options, dataAdapter) {
     this.$element = $element;
     this.data = dataAdapter;
@@ -10065,6 +10066,33 @@ define('select2/results',[
       self.displayMessage(params);
     });
 
+    if ($.fn.mousewheel) {
+      this.$results.on('mousewheel', function (e) {
+        var top = self.$results.scrollTop();
+
+        var bottom = (
+          self.$results.get(0).scrollHeight -
+          self.$results.scrollTop() +
+          e.deltaY
+        );
+
+        var isAtTop = e.deltaY > 0 && top - e.deltaY <= 0;
+        var isAtBottom = e.deltaY < 0 && bottom <= self.$results.height();
+
+        if (isAtTop) {
+          self.$results.scrollTop(0);
+          e.preventDefault();
+          e.stopPropagation();
+        } else if (isAtBottom) {
+          self.$results.scrollTop(
+            self.$results.get(0).scrollHeight - self.$results.height()
+          );
+          e.preventDefault();
+          e.stopPropagation();
+        }
+      });
+    }
+
     this.$results.on('mouseup', '.select2-results__option[aria-selected]',
       function (evt) {
       var $this = $(this);
@@ -13536,6 +13564,228 @@ define('select2/core',[
   return Select2;
 });
 
+/*!
+ * jQuery Mousewheel 3.1.12
+ *
+ * Copyright 2014 jQuery Foundation and other contributors
+ * Released under the MIT license.
+ * http://jquery.org/license
+ */
+
+(function (factory) {
+    if ( typeof define === 'function' && define.amd ) {
+        // AMD. Register as an anonymous module.
+        define('jquery.mousewheel',['jquery'], factory);
+    } else if (typeof exports === 'object') {
+        // Node/CommonJS style for Browserify
+        module.exports = factory;
+    } else {
+        // Browser globals
+        factory(jQuery);
+    }
+}(function ($) {
+
+    var toFix  = ['wheel', 'mousewheel', 'DOMMouseScroll', 'MozMousePixelScroll'],
+        toBind = ( 'onwheel' in document || document.documentMode >= 9 ) ?
+                    ['wheel'] : ['mousewheel', 'DomMouseScroll', 'MozMousePixelScroll'],
+        slice  = Array.prototype.slice,
+        nullLowestDeltaTimeout, lowestDelta;
+
+    if ( $.event.fixHooks ) {
+        for ( var i = toFix.length; i; ) {
+            $.event.fixHooks[ toFix[--i] ] = $.event.mouseHooks;
+        }
+    }
+
+    var special = $.event.special.mousewheel = {
+        version: '3.1.12',
+
+        setup: function() {
+            if ( this.addEventListener ) {
+                for ( var i = toBind.length; i; ) {
+                    this.addEventListener( toBind[--i], handler, false );
+                }
+            } else {
+                this.onmousewheel = handler;
+            }
+            // Store the line height and page height for this particular element
+            $.data(this, 'mousewheel-line-height', special.getLineHeight(this));
+            $.data(this, 'mousewheel-page-height', special.getPageHeight(this));
+        },
+
+        teardown: function() {
+            if ( this.removeEventListener ) {
+                for ( var i = toBind.length; i; ) {
+                    this.removeEventListener( toBind[--i], handler, false );
+                }
+            } else {
+                this.onmousewheel = null;
+            }
+            // Clean up the data we added to the element
+            $.removeData(this, 'mousewheel-line-height');
+            $.removeData(this, 'mousewheel-page-height');
+        },
+
+        getLineHeight: function(elem) {
+            var $elem = $(elem),
+                $parent = $elem['offsetParent' in $.fn ? 'offsetParent' : 'parent']();
+            if (!$parent.length) {
+                $parent = $('body');
+            }
+            return parseInt($parent.css('fontSize'), 10) || parseInt($elem.css('fontSize'), 10) || 16;
+        },
+
+        getPageHeight: function(elem) {
+            return $(elem).height();
+        },
+
+        settings: {
+            adjustOldDeltas: true, // see shouldAdjustOldDeltas() below
+            normalizeOffset: true  // calls getBoundingClientRect for each event
+        }
+    };
+
+    $.fn.extend({
+        mousewheel: function(fn) {
+            return fn ? this.bind('mousewheel', fn) : this.trigger('mousewheel');
+        },
+
+        unmousewheel: function(fn) {
+            return this.unbind('mousewheel', fn);
+        }
+    });
+
+
+    function handler(event) {
+        var orgEvent   = event || window.event,
+            args       = slice.call(arguments, 1),
+            delta      = 0,
+            deltaX     = 0,
+            deltaY     = 0,
+            absDelta   = 0,
+            offsetX    = 0,
+            offsetY    = 0;
+        event = $.event.fix(orgEvent);
+        event.type = 'mousewheel';
+
+        // Old school scrollwheel delta
+        if ( 'detail'      in orgEvent ) { deltaY = orgEvent.detail * -1;      }
+        if ( 'wheelDelta'  in orgEvent ) { deltaY = orgEvent.wheelDelta;       }
+        if ( 'wheelDeltaY' in orgEvent ) { deltaY = orgEvent.wheelDeltaY;      }
+        if ( 'wheelDeltaX' in orgEvent ) { deltaX = orgEvent.wheelDeltaX * -1; }
+
+        // Firefox < 17 horizontal scrolling related to DOMMouseScroll event
+        if ( 'axis' in orgEvent && orgEvent.axis === orgEvent.HORIZONTAL_AXIS ) {
+            deltaX = deltaY * -1;
+            deltaY = 0;
+        }
+
+        // Set delta to be deltaY or deltaX if deltaY is 0 for backwards compatabilitiy
+        delta = deltaY === 0 ? deltaX : deltaY;
+
+        // New school wheel delta (wheel event)
+        if ( 'deltaY' in orgEvent ) {
+            deltaY = orgEvent.deltaY * -1;
+            delta  = deltaY;
+        }
+        if ( 'deltaX' in orgEvent ) {
+            deltaX = orgEvent.deltaX;
+            if ( deltaY === 0 ) { delta  = deltaX * -1; }
+        }
+
+        // No change actually happened, no reason to go any further
+        if ( deltaY === 0 && deltaX === 0 ) { return; }
+
+        // Need to convert lines and pages to pixels if we aren't already in pixels
+        // There are three delta modes:
+        //   * deltaMode 0 is by pixels, nothing to do
+        //   * deltaMode 1 is by lines
+        //   * deltaMode 2 is by pages
+        if ( orgEvent.deltaMode === 1 ) {
+            var lineHeight = $.data(this, 'mousewheel-line-height');
+            delta  *= lineHeight;
+            deltaY *= lineHeight;
+            deltaX *= lineHeight;
+        } else if ( orgEvent.deltaMode === 2 ) {
+            var pageHeight = $.data(this, 'mousewheel-page-height');
+            delta  *= pageHeight;
+            deltaY *= pageHeight;
+            deltaX *= pageHeight;
+        }
+
+        // Store lowest absolute delta to normalize the delta values
+        absDelta = Math.max( Math.abs(deltaY), Math.abs(deltaX) );
+
+        if ( !lowestDelta || absDelta < lowestDelta ) {
+            lowestDelta = absDelta;
+
+            // Adjust older deltas if necessary
+            if ( shouldAdjustOldDeltas(orgEvent, absDelta) ) {
+                lowestDelta /= 40;
+            }
+        }
+
+        // Adjust older deltas if necessary
+        if ( shouldAdjustOldDeltas(orgEvent, absDelta) ) {
+            // Divide all the things by 40!
+            delta  /= 40;
+            deltaX /= 40;
+            deltaY /= 40;
+        }
+
+        // Get a whole, normalized value for the deltas
+        delta  = Math[ delta  >= 1 ? 'floor' : 'ceil' ](delta  / lowestDelta);
+        deltaX = Math[ deltaX >= 1 ? 'floor' : 'ceil' ](deltaX / lowestDelta);
+        deltaY = Math[ deltaY >= 1 ? 'floor' : 'ceil' ](deltaY / lowestDelta);
+
+        // Normalise offsetX and offsetY properties
+        if ( special.settings.normalizeOffset && this.getBoundingClientRect ) {
+            var boundingRect = this.getBoundingClientRect();
+            offsetX = event.clientX - boundingRect.left;
+            offsetY = event.clientY - boundingRect.top;
+        }
+
+        // Add information to the event object
+        event.deltaX = deltaX;
+        event.deltaY = deltaY;
+        event.deltaFactor = lowestDelta;
+        event.offsetX = offsetX;
+        event.offsetY = offsetY;
+        // Go ahead and set deltaMode to 0 since we converted to pixels
+        // Although this is a little odd since we overwrite the deltaX/Y
+        // properties with normalized deltas.
+        event.deltaMode = 0;
+
+        // Add event and delta to the front of the arguments
+        args.unshift(event, delta, deltaX, deltaY);
+
+        // Clearout lowestDelta after sometime to better
+        // handle multiple device types that give different
+        // a different lowestDelta
+        // Ex: trackpad = 3 and mouse wheel = 120
+        if (nullLowestDeltaTimeout) { clearTimeout(nullLowestDeltaTimeout); }
+        nullLowestDeltaTimeout = setTimeout(nullLowestDelta, 200);
+
+        return ($.event.dispatch || $.event.handle).apply(this, args);
+    }
+
+    function nullLowestDelta() {
+        lowestDelta = null;
+    }
+
+    function shouldAdjustOldDeltas(orgEvent, absDelta) {
+        // If this is an older event and the delta is divisable by 120,
+        // then we are assuming that the browser is treating this as an
+        // older mouse wheel event and that we should divide the deltas
+        // by 40 to try and get a more usable deltaFactor.
+        // Side note, this actually impacts the reported scroll distance
+        // in older browsers and can cause scrolling to be slower than native.
+        // Turn this off by setting $.event.special.mousewheel.settings.adjustOldDeltas to false.
+        return special.settings.adjustOldDeltas && orgEvent.type === 'mousewheel' && absDelta % 120 === 0;
+    }
+
+}));
+
 define('select2/compat/matcher',[
 
 ], function () {
@@ -13602,6 +13852,11 @@ define('jquery.select2',[
   'jquery',
   'select2/core'
 ], function ($, Select2) {
+  // Force jQuery.mousewheel to be loaded if it hasn't already
+  try {
+    require('jquery.mousewheel');
+  } catch (Exception) { }
+
   if ($.fn.select2 == null) {
     $.fn.select2 = function (options) {
       options = options || {};
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index 1a2ad855..6c930478 100644
--- a/dist/js/select2.full.min.js
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b=c(this);if(b.is("option")||b.is("optgroup")){var f=e.item(b),g=e.matches(a,f);null!==g&&d.push(g)}}),b(d)},d.prototype.option=function(a){var b=document.createElement("option");b.value=a.id,a.disabled&&(b.disabled=!0),a.selected&&(b.selected=!0),b.innerText=a.text;var d=c(b),e=this._normalizeItem(a);return e.element=b,c.data(b,"data",e),d},d.prototype.item=function(a){var b={};if(b=c.data(a[0],"data"),null!=b)return b;if(a.is("option"))b={id:a.val(),text:a.html(),disabled:a.prop("disabled"),selected:a.prop("selected")};else if(a.is("optgroup")){b={text:a.attr("label"),children:[]};for(var d=a.children("option"),e=[],f=0;f<d.length;f++){var g=c(d[f]),h=this.item(g);e.push(h)}b.children=e}return b=this._normalizeItem(b),b.element=a[0],c.data(a[0],"data",b),b},d.prototype._normalizeItem=function(a){c.isPlainObject(a)||(a={id:a,text:a}),a=c.extend({},{text:""},a);var b={selected:!1,disabled:!1};return null!=a.id&&(a.id=a.id.toString()),null!=a.text&&(a.text=a.text.toString()),null==a._resultId&&a.id&&null!=this.container&&(a._resultId=this.generateResultId(this.container,a)),c.extend({},b,a)},d.prototype.matches=function(a,b){var c=this.options.get("matcher");return c(a,b)},d}),c("select2/data/array",["./select","../utils","jquery"],function(a,b,c){function d(a,b){var c=b.get("data");d.__super__.constructor.call(this,a,b),this.convertToOptions(c)}return b.Extend(d,a),d.prototype.select=function(a){var b=this.$element.find('option[value="'+a.id+'"]');0===b.length&&(b=this.option(a),this.$element.append(b)),d.__super__.select.call(this,a)},d.prototype.convertToOptions=function(a){function b(a){return function(){return c(this).val()==a.id}}for(var d=this,e=this.$element.find("option"),f=e.map(function(){return d.item(c(this)).id}).get(),g=0;g<a.length;g++){var h=a[g];if(h.id=h.id.toString(),f.indexOf(h.id)>=0){var i=e.filter(b(h)),j=this.item(i),k=(c.extend(!0,{},j,h),this.option(j));i.replaceWith(k)}else{var l=this.option(h);this.$element.append(l)}}},d}),c("select2/data/ajax",["./array","../utils","jquery"],function(a,b,c){function d(b,c){this.ajaxOptions=c.get("ajax"),null!=this.ajaxOptions.processResults&&(this.processResults=this.ajaxOptions.processResults),a.__super__.constructor.call(this,b,c)}return b.Extend(d,a),d.prototype.processResults=function(a){return a},d.prototype.query=function(a,b){function d(){var d=c.ajax(f);d.success(function(c){var d=e.processResults(c,a);b(d)}),e._request=d}var e=this;this._request&&(this._request.abort(),this._request=null);var f=c.extend({type:"GET"},this.ajaxOptions);"function"==typeof f.url&&(f.url=f.url(a)),"function"==typeof f.data&&(f.data=f.data(a)),this.ajaxOptions.delay&&""!==a.term?(this._queryTimeout&&window.clearTimeout(this._queryTimeout),this._queryTimeout=window.setTimeout(d,this.ajaxOptions.delay)):d()},d}),c("select2/data/tags",[],function(){function a(a,b,c){var d=c.get("tags");if(a.call(this,b,c),$.isArray(d))for(var e=0;e<d.length;e++){var f=d[e],g=this._normalizeItem(f),h=this.option(g);this.$element.append(h)}}return a.prototype.query=function(a,b,c){function d(a,f){for(var g=0;g<a.length;g++){var h=a[g],i=null!=h.children&&!d(h.children,!0),j=h.text===b.term;if(j||i)return f?!1:void c(a)}if(f)return!0;var k=e.createTag(b);if(null!=k){var l=e.option(k);l.attr("data-select2-tag",!0),e.$element.append(l),e.insertTag(a,k)}c(a)}var e=this;return this._removeOldTags(),null==b.term||""===b.term||null!=b.page?void a.call(this,b,c):void a.call(this,b,d)},a.prototype.createTag=function(a,b){return{id:b.term,text:b.term}},a.prototype.insertTag=function(a,b,c){b.unshift(c)},a.prototype._removeOldTags=function(){var a=(this._lastTag,this.$element.find("option[data-select2-tag]"));a.each(function(){this.selected||$(this).remove()})},a}),c("select2/data/minimumInputLength",[],function(){function a(a,b,c){this.minimumInputLength=c.get("minimumInputLength"),a.call(this,b,c)}return a.prototype.query=function(a,b,c){return b.term=b.term||"",b.term.length<this.minimumInputLength?void this.trigger("results:message",{message:"inputTooShort",args:{minimum:this.minimumInputLength,input:b.term,params:b}}):void a.call(this,b,c)},a}),c("select2/data/maximumInputLength",[],function(){function a(a,b,c){this.maximumInputLength=c.get("maximumInputLength"),a.call(this,b,c)}return a.prototype.query=function(a,b,c){return b.term=b.term||"",this.maximumInputLength>0&&b.term.length>this.maximumInputLength?void this.trigger("results:message",{message:"inputTooLong",args:{minimum:this.maximumInputLength,input:b.term,params:b}}):void a.call(this,b,c)},a}),c("select2/dropdown",["./utils"],function(a){function b(a,c){this.$element=a,this.options=c,b.__super__.constructor.call(this)}return a.Extend(b,a.Observable),b.prototype.render=function(){var a=$('<span class="select2-dropdown"><span class="select2-results"></span></span>');return a.attr("dir",this.options.get("dir")),this.$dropdown=a,a},b.prototype.position=function(){},b.prototype.destroy=function(){this.$dropdown.remove()},b.prototype.bind=function(){},b}),c("select2/dropdown/search",["../utils"],function(){function a(){}return a.prototype.render=function(a){var b=a.call(this),c=$('<span class="select2-search select2-search--dropdown"><input class="select2-search__field" type="search" tabindex="-1" role="textbox" /></span>');return this.$searchContainer=c,this.$search=c.find("input"),b.prepend(c),b},a.prototype.bind=function(a,b,c){var d=this;a.call(this,b,c),this.$search.on("keydown",function(a){d.trigger("keypress",a),d._keyUpPrevented=a.isDefaultPrevented()}),this.$search.on("keyup",function(a){d.handleSearch(a)}),b.on("open",function(){d.$search.attr("tabindex",0),d.$search.focus()}),b.on("close",function(){d.$search.attr("tabindex",-1),d.$search.val("")}),b.on("results:all",function(a){if(null==a.query.term||""===a.query.term){var b=d.showSearch(a);b?d.$searchContainer.removeClass("select2-search--hide"):d.$searchContainer.addClass("select2-search--hide")}})},a.prototype.handleSearch=function(){if(!this._keyUpPrevented){var a=this.$search.val();this.trigger("query",{term:a})}this._keyUpPrevented=!1},a.prototype.showSearch=function(){return!0},a}),c("select2/dropdown/hidePlaceholder",[],function(){function a(a,b,c,d){this.placeholder=this.normalizePlaceholder(c.get("placeholder")),a.call(this,b,c,d)}return a.prototype.append=function(a,b){b=this.removePlaceholder(b),a.call(this,b)},a.prototype.normalizePlaceholder=function(a,b){return"string"==typeof b&&(b={id:"",text:b}),b},a.prototype.removePlaceholder=function(a,b){for(var c=b.slice(0),d=b.length-1;d>=0;d--){var e=b[d];this.placeholder.id===e.id&&c.splice(d,1)}return c},a}),c("select2/dropdown/infiniteScroll",["jquery"],function(a){function b(a,b,c,d){this.lastParams={},a.call(this,b,c,d),this.$loadingMore=this.createLoadingMore(),this.loading=!1}return b.prototype.append=function(b,c){return this.$loadingMore.remove(),this.loading=!1,a.isArray(c)?void b.call(this,c):(b.call(this,c.results),void(this.showLoadingMore(c)&&this.$results.append(this.$loadingMore)))},b.prototype.bind=function(b,c,d){var e=this;b.call(this,c,d),c.on("query",function(a){e.lastParams=a,e.loading=!0}),c.on("query:append",function(a){e.lastParams=a,e.loading=!0}),this.$results.on("scroll",function(){var b=a.contains(document.documentElement,e.$loadingMore[0]);if(!e.loading&&b){var c=e.$results.offset().top+e.$results.outerHeight(!1),d=e.$loadingMore.offset().top+e.$loadingMore.outerHeight(!1);c+50>=d&&e.loadMore()}})},b.prototype.loadMore=function(){this.loading=!0;var b=a.extend({},{page:1},this.lastParams);b.page++,this.trigger("query:append",b)},b.prototype.showLoadingMore=function(a,b){return b.pagination&&b.pagination.more},b.prototype.createLoadingMore=function(){var b=a('<li class="option load-more" role="treeitem"></li>'),c=this.options.get("translations").get("loadingMore");return b.html(c(this.lastParams)),b},b}),c("select2/dropdown/attachBody",[],function(){function a(a,b,c){this.$dropdownParent=c.get("dropdownParent")||document.body,a.call(this,b,c)}return a.prototype.bind=function(a,b,c){var d=this,e=!1;a.call(this,b,c),b.on("open",function(){d._showDropdown(),e||(e=!0,b.on("results:all",function(){d._positionDropdown()}),b.on("results:append",function(){d._positionDropdown()}))}),b.on("close",function(){d._hideDropdown()}),this.$dropdownContainer.on("mousedown",function(a){a.stopPropagation()})},a.prototype.position=function(a,b,c){b.attr("class",c.attr("class")),b.removeClass("select2"),b.addClass("select2-container--open"),b.css({position:"absolute"}),b.width(c.outerWidth(!1)),this.$container=c},a.prototype.render=function(a){var b=$("<span></span>"),c=a.call(this);return b.append(c),this.$dropdownContainer=b,b},a.prototype._hideDropdown=function(){this.$dropdownContainer.detach()},a.prototype._positionDropdown=function(){var a=$(window),b=this.$dropdown.hasClass("select2-dropdown--above"),c=this.$dropdown.hasClass("select2-dropdown--below"),d=null,e=(this.$container.position(),this.$container.offset());e.bottom=e.top+this.$container.outerHeight(!1);var f={height:this.$container.outerHeight(!1)};f.top=e.top,f.bottom=e.top+f.height;var g={height:this.$dropdown.outerHeight(!1)},h={top:a.scrollTop(),bottom:a.scrollTop()+a.height()},i=h.top<e.top-g.height,j=h.bottom>e.bottom+g.height,k={left:e.left,top:f.bottom};b||c||(d="below"),j||!i||b?!i&&j&&b&&(d="below"):d="above",("above"==d||b)&&(k.top=f.top-g.height),null!=d&&(this.$dropdown.removeClass("select2-dropdown--below select2-dropdown--above").addClass("select2-dropdown--"+d),this.$container.removeClass("select2-container--below select2-container--above").addClass("select2-container--"+d)),this.$dropdownContainer.css(k)},a.prototype._showDropdown=function(){this.$dropdownContainer.appendTo(this.$dropdownParent),this._positionDropdown()},a}),c("select2/dropdown/minimumResultsForSearch",[],function(){function a(b){count=0;for(var c=0;c<b.length;c++){var d=b[c];d.children?count+=a(d.children):count++}return count}function b(a,b,c,d){this.minimumResultsForSearch=c.get("minimumResultsForSearch"),a.call(this,b,c,d)}return b.prototype.showSearch=function(b,c){return a(c.data)<this.minimumResultsForSearch?!1:b.call(this,c)},b}),c("select2/i18n/en",[],function(){return{errorLoading:function(){return"The results could not be loaded."},inputTooLong:function(a){var b=a.input.length-a.maximum,c="Please delete "+b+" character";return 1!=b&&(c+="s"),c},inputTooShort:function(a){var b=a.minimum-a.input.length,c="Please enter "+b+" or more characters";return c},loadingMore:function(){return"Loading more results…"},maximumSelected:function(a){var b="You can only select "+a.maximum+" item";return 1!=a.maximum&&(b+="s"),b},noResults:function(){return"No results found"},searching:function(){return"Searching…"}}}),c("select2/defaults",["jquery","./results","./selection/single","./selection/multiple","./selection/placeholder","./selection/allowClear","./selection/search","./utils","./translation","./diacritics","./data/select","./data/array","./data/ajax","./data/tags","./data/minimumInputLength","./data/maximumInputLength","./dropdown","./dropdown/search","./dropdown/hidePlaceholder","./dropdown/infiniteScroll","./dropdown/attachBody","./dropdown/minimumResultsForSearch","./i18n/en"],function(a,b,c,d,e,f,g,h,i,j,k,l,m,n,o,p,q,r,s,t,u,v,w){function x(){this.reset()}x.prototype.apply=function(j){if(j=a.extend({},this.defaults,j),null==j.dataAdapter&&(j.dataAdapter=null!=j.ajax?m:null!=j.data?l:k,j.minimumInputLength>0&&(j.dataAdapter=h.Decorate(j.dataAdapter,o)),j.maximumInputLength>0&&(j.dataAdapter=h.Decorate(j.dataAdapter,p)),null!=j.tags&&(j.dataAdapter=h.Decorate(j.dataAdapter,n))),null==j.resultsAdapter&&(j.resultsAdapter=b,null!=j.ajax&&(j.resultsAdapter=h.Decorate(j.resultsAdapter,t)),null!=j.placeholder&&(j.resultsAdapter=h.Decorate(j.resultsAdapter,s))),null==j.dropdownAdapter){if(j.multiple)j.dropdownAdapter=q;else{var w=h.Decorate(q,r);j.dropdownAdapter=w}j.minimumResultsForSearch>0&&(j.dropdownAdapter=h.Decorate(j.dropdownAdapter,v)),j.dropdownAdapter=h.Decorate(j.dropdownAdapter,u)}if(null==j.selectionAdapter&&(j.selectionAdapter=j.multiple?d:c,null!=j.placeholder&&(j.selectionAdapter=h.Decorate(j.selectionAdapter,e),j.allowClear&&(j.selectionAdapter=h.Decorate(j.selectionAdapter,f))),j.multiple&&(j.selectionAdapter=h.Decorate(j.selectionAdapter,g))),"string"==typeof j.language&&(j.language=[j.language]),a.isArray(j.language)){var x=new i;j.language.push("en");for(var y=j.language,z=0;z<y.length;z++){var A=y[z],B={};try{B=i.loadPath(A)}catch(C){A="select2/i18n/"+A,B=i.loadPath(A)}x.extend(B)}j.translations=x}else j.translations=new i(j.language);return j},x.prototype.reset=function(){function b(a){function b(a){return j[a]||a}return a.replace(/[^\u0000-\u007E]/g,b)}function c(d,e){if(""===a.trim(d.term))return e;if(e.children&&e.children.length>0){for(var f=a.extend(!0,{},e),g=e.children.length-1;g>=0;g--){var h=e.children[g],i=c(d,h);null==i&&f.children.splice(g,1)}return f.children.length>0?f:c(d,f)}var j=b(e.text).toUpperCase(),k=b(d.term).toUpperCase();return j.indexOf(k)>-1?e:null}this.defaults={language:w,matcher:c,sorter:function(a){return a},minimumInputLength:0,maximumInputLength:0,minimumResultsForSearch:0,templateResult:function(a){return a.text},templateSelection:function(a){return a.text},theme:"default"}};var y=new x;return y}),c("select2/options",["jquery","./defaults"],function(a,b){function c(a,c){this.options=a,null!=c&&this.fromElement(c),this.options=b.apply(this.options)}return c.prototype.fromElement=function(b){function c(a){for(var b in a){var c=b.split("-"),d=a;if(1!==c.length){for(var e=0;e<c.length;e++){var f=c[e];f=f.substring(0,1).toLowerCase()+f.substring(1),f in d||(d[f]={}),e==c.length-1&&(d[f]=a[b]),d=d[f]}delete a[b]}}return a}var d=["select2"];null==this.options.multiple&&(this.options.multiple=b.prop("multiple")),null==this.options.disabled&&(this.options.disabled=b.prop("disabled")),null==this.options.language&&(b.prop("lang")?this.options.language=b.prop("lang").toLowerCase():b.closest("[lang]").prop("lang")&&(this.options.language=b.closest("[lang]").prop("lang"))),null==this.options.dir&&(this.options.dir=b.prop("dir")?b.prop("dir"):b.closest("[dir]").prop("dir")?b.closest("[dir]").prop("dir"):"ltr"),b.prop("disabled",this.options.disabled),b.prop("multiple",this.options.multiple),b.data("select2-tags")&&(console&&console.warn&&console.warn('Select2: The `data-select2-tags` attribute has been changed to use the `data-data` and `data-tags="true"` attributes and will be removed in future versions of Select2.'),b.data("data",b.data("select2-tags")),b.data("tags",!0)),b.data("ajax-url")&&(console&&console.warn&&console.warn("Select2: The `data-ajax-attribute` has been changed to `data-ajax--url` and support for the old attribute will be removed in future versions of Select2."),b.data("ajax--url",b.data("ajax-url")));var e=b.data();e=c(e);for(var f in e)d.indexOf(f)>-1||(a.isPlainObject(this.options[f])?a.extend(this.options[f],e[f]):this.options[f]=e[f]);return this},c.prototype.get=function(a){return this.options[a]},c.prototype.set=function(a,b){this.options[a]=b},c}),c("select2/core",["jquery","./options","./utils","./keys"],function(a,b,c,d){var e=function(a,c){null!=a.data("select2")&&a.data("select2").destroy(),this.$element=a,this.id=this._generateId(a),c=c||{},this.options=new b(c,a),e.__super__.constructor.call(this);var d=this.options.get("dataAdapter");this.data=new d(a,this.options);var f=this.render();this._placeContainer(f);var g=this.options.get("selectionAdapter");this.selection=new g(a,this.options),this.$selection=this.selection.render(),this.selection.position(this.$selection,f);var h=this.options.get("dropdownAdapter");this.dropdown=new h(a,this.options),this.$dropdown=this.dropdown.render(),this.dropdown.position(this.$dropdown,f);var i=this.options.get("resultsAdapter");this.results=new i(a,this.options,this.data),this.$results=this.results.render(),this.results.position(this.$results,this.$dropdown);var j=this;this._bindAdapters(),this._registerDomEvents(),this._registerDataEvents(),this._registerSelectionEvents(),this._registerDropdownEvents(),this._registerResultsEvents(),this._registerEvents(),this.data.current(function(a){j.trigger("selection:update",{data:a})}),a.hide(),this._syncAttributes(),this._tabindex=a.attr("tabindex")||0,a.attr("tabindex","-1"),a.data("select2",this)};return c.Extend(e,c.Observable),e.prototype._generateId=function(a){var b="";return b=null!=a.attr("id")?a.attr("id"):null!=a.attr("name")?a.attr("name")+"-"+c.generateChars(2):c.generateChars(4),b="select2-"+b
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b=c(this);if(b.is("option")||b.is("optgroup")){var f=e.item(b),g=e.matches(a,f);null!==g&&d.push(g)}}),b(d)},d.prototype.option=function(a){var b=document.createElement("option");b.value=a.id,a.disabled&&(b.disabled=!0),a.selected&&(b.selected=!0),b.innerText=a.text;var d=c(b),e=this._normalizeItem(a);return e.element=b,c.data(b,"data",e),d},d.prototype.item=function(a){var b={};if(b=c.data(a[0],"data"),null!=b)return b;if(a.is("option"))b={id:a.val(),text:a.html(),disabled:a.prop("disabled"),selected:a.prop("selected")};else if(a.is("optgroup")){b={text:a.attr("label"),children:[]};for(var d=a.children("option"),e=[],f=0;f<d.length;f++){var g=c(d[f]),h=this.item(g);e.push(h)}b.children=e}return b=this._normalizeItem(b),b.element=a[0],c.data(a[0],"data",b),b},d.prototype._normalizeItem=function(a){c.isPlainObject(a)||(a={id:a,text:a}),a=c.extend({},{text:""},a);var b={selected:!1,disabled:!1};return null!=a.id&&(a.id=a.id.toString()),null!=a.text&&(a.text=a.text.toString()),null==a._resultId&&a.id&&null!=this.container&&(a._resultId=this.generateResultId(this.container,a)),c.extend({},b,a)},d.prototype.matches=function(a,b){var c=this.options.get("matcher");return c(a,b)},d}),c("select2/data/array",["./select","../utils","jquery"],function(a,b,c){function d(a,b){var c=b.get("data");d.__super__.constructor.call(this,a,b),this.convertToOptions(c)}return b.Extend(d,a),d.prototype.select=function(a){var b=this.$element.find('option[value="'+a.id+'"]');0===b.length&&(b=this.option(a),this.$element.append(b)),d.__super__.select.call(this,a)},d.prototype.convertToOptions=function(a){function b(a){return function(){return c(this).val()==a.id}}for(var d=this,e=this.$element.find("option"),f=e.map(function(){return d.item(c(this)).id}).get(),g=0;g<a.length;g++){var h=a[g];if(h.id=h.id.toString(),f.indexOf(h.id)>=0){var i=e.filter(b(h)),j=this.item(i),k=(c.extend(!0,{},j,h),this.option(j));i.replaceWith(k)}else{var l=this.option(h);this.$element.append(l)}}},d}),c("select2/data/ajax",["./array","../utils","jquery"],function(a,b,c){function d(b,c){this.ajaxOptions=c.get("ajax"),null!=this.ajaxOptions.processResults&&(this.processResults=this.ajaxOptions.processResults),a.__super__.constructor.call(this,b,c)}return b.Extend(d,a),d.prototype.processResults=function(a){return a},d.prototype.query=function(a,b){function d(){var d=c.ajax(f);d.success(function(c){var d=e.processResults(c,a);b(d)}),e._request=d}var e=this;this._request&&(this._request.abort(),this._request=null);var f=c.extend({type:"GET"},this.ajaxOptions);"function"==typeof f.url&&(f.url=f.url(a)),"function"==typeof f.data&&(f.data=f.data(a)),this.ajaxOptions.delay&&""!==a.term?(this._queryTimeout&&window.clearTimeout(this._queryTimeout),this._queryTimeout=window.setTimeout(d,this.ajaxOptions.delay)):d()},d}),c("select2/data/tags",[],function(){function a(a,b,c){var d=c.get("tags");if(a.call(this,b,c),$.isArray(d))for(var e=0;e<d.length;e++){var f=d[e],g=this._normalizeItem(f),h=this.option(g);this.$element.append(h)}}return a.prototype.query=function(a,b,c){function d(a,f){for(var g=0;g<a.length;g++){var h=a[g],i=null!=h.children&&!d(h.children,!0),j=h.text===b.term;if(j||i)return f?!1:void c(a)}if(f)return!0;var k=e.createTag(b);if(null!=k){var l=e.option(k);l.attr("data-select2-tag",!0),e.$element.append(l),e.insertTag(a,k)}c(a)}var e=this;return this._removeOldTags(),null==b.term||""===b.term||null!=b.page?void a.call(this,b,c):void a.call(this,b,d)},a.prototype.createTag=function(a,b){return{id:b.term,text:b.term}},a.prototype.insertTag=function(a,b,c){b.unshift(c)},a.prototype._removeOldTags=function(){var a=(this._lastTag,this.$element.find("option[data-select2-tag]"));a.each(function(){this.selected||$(this).remove()})},a}),c("select2/data/minimumInputLength",[],function(){function a(a,b,c){this.minimumInputLength=c.get("minimumInputLength"),a.call(this,b,c)}return a.prototype.query=function(a,b,c){return b.term=b.term||"",b.term.length<this.minimumInputLength?void this.trigger("results:message",{message:"inputTooShort",args:{minimum:this.minimumInputLength,input:b.term,params:b}}):void a.call(this,b,c)},a}),c("select2/data/maximumInputLength",[],function(){function a(a,b,c){this.maximumInputLength=c.get("maximumInputLength"),a.call(this,b,c)}return a.prototype.query=function(a,b,c){return b.term=b.term||"",this.maximumInputLength>0&&b.term.length>this.maximumInputLength?void this.trigger("results:message",{message:"inputTooLong",args:{minimum:this.maximumInputLength,input:b.term,params:b}}):void a.call(this,b,c)},a}),c("select2/dropdown",["./utils"],function(a){function b(a,c){this.$element=a,this.options=c,b.__super__.constructor.call(this)}return a.Extend(b,a.Observable),b.prototype.render=function(){var a=$('<span class="select2-dropdown"><span class="select2-results"></span></span>');return a.attr("dir",this.options.get("dir")),this.$dropdown=a,a},b.prototype.position=function(){},b.prototype.destroy=function(){this.$dropdown.remove()},b.prototype.bind=function(){},b}),c("select2/dropdown/search",["../utils"],function(){function a(){}return a.prototype.render=function(a){var b=a.call(this),c=$('<span class="select2-search select2-search--dropdown"><input class="select2-search__field" type="search" tabindex="-1" role="textbox" /></span>');return this.$searchContainer=c,this.$search=c.find("input"),b.prepend(c),b},a.prototype.bind=function(a,b,c){var d=this;a.call(this,b,c),this.$search.on("keydown",function(a){d.trigger("keypress",a),d._keyUpPrevented=a.isDefaultPrevented()}),this.$search.on("keyup",function(a){d.handleSearch(a)}),b.on("open",function(){d.$search.attr("tabindex",0),d.$search.focus()}),b.on("close",function(){d.$search.attr("tabindex",-1),d.$search.val("")}),b.on("results:all",function(a){if(null==a.query.term||""===a.query.term){var b=d.showSearch(a);b?d.$searchContainer.removeClass("select2-search--hide"):d.$searchContainer.addClass("select2-search--hide")}})},a.prototype.handleSearch=function(){if(!this._keyUpPrevented){var a=this.$search.val();this.trigger("query",{term:a})}this._keyUpPrevented=!1},a.prototype.showSearch=function(){return!0},a}),c("select2/dropdown/hidePlaceholder",[],function(){function a(a,b,c,d){this.placeholder=this.normalizePlaceholder(c.get("placeholder")),a.call(this,b,c,d)}return a.prototype.append=function(a,b){b=this.removePlaceholder(b),a.call(this,b)},a.prototype.normalizePlaceholder=function(a,b){return"string"==typeof b&&(b={id:"",text:b}),b},a.prototype.removePlaceholder=function(a,b){for(var c=b.slice(0),d=b.length-1;d>=0;d--){var e=b[d];this.placeholder.id===e.id&&c.splice(d,1)}return c},a}),c("select2/dropdown/infiniteScroll",["jquery"],function(a){function b(a,b,c,d){this.lastParams={},a.call(this,b,c,d),this.$loadingMore=this.createLoadingMore(),this.loading=!1}return b.prototype.append=function(b,c){return this.$loadingMore.remove(),this.loading=!1,a.isArray(c)?void b.call(this,c):(b.call(this,c.results),void(this.showLoadingMore(c)&&this.$results.append(this.$loadingMore)))},b.prototype.bind=function(b,c,d){var e=this;b.call(this,c,d),c.on("query",function(a){e.lastParams=a,e.loading=!0}),c.on("query:append",function(a){e.lastParams=a,e.loading=!0}),this.$results.on("scroll",function(){var b=a.contains(document.documentElement,e.$loadingMore[0]);if(!e.loading&&b){var c=e.$results.offset().top+e.$results.outerHeight(!1),d=e.$loadingMore.offset().top+e.$loadingMore.outerHeight(!1);c+50>=d&&e.loadMore()}})},b.prototype.loadMore=function(){this.loading=!0;var b=a.extend({},{page:1},this.lastParams);b.page++,this.trigger("query:append",b)},b.prototype.showLoadingMore=function(a,b){return b.pagination&&b.pagination.more},b.prototype.createLoadingMore=function(){var b=a('<li class="option load-more" role="treeitem"></li>'),c=this.options.get("translations").get("loadingMore");return b.html(c(this.lastParams)),b},b}),c("select2/dropdown/attachBody",[],function(){function a(a,b,c){this.$dropdownParent=c.get("dropdownParent")||document.body,a.call(this,b,c)}return a.prototype.bind=function(a,b,c){var d=this,e=!1;a.call(this,b,c),b.on("open",function(){d._showDropdown(),e||(e=!0,b.on("results:all",function(){d._positionDropdown()}),b.on("results:append",function(){d._positionDropdown()}))}),b.on("close",function(){d._hideDropdown()}),this.$dropdownContainer.on("mousedown",function(a){a.stopPropagation()})},a.prototype.position=function(a,b,c){b.attr("class",c.attr("class")),b.removeClass("select2"),b.addClass("select2-container--open"),b.css({position:"absolute"}),b.width(c.outerWidth(!1)),this.$container=c},a.prototype.render=function(a){var b=$("<span></span>"),c=a.call(this);return b.append(c),this.$dropdownContainer=b,b},a.prototype._hideDropdown=function(){this.$dropdownContainer.detach()},a.prototype._positionDropdown=function(){var a=$(window),b=this.$dropdown.hasClass("select2-dropdown--above"),c=this.$dropdown.hasClass("select2-dropdown--below"),d=null,e=(this.$container.position(),this.$container.offset());e.bottom=e.top+this.$container.outerHeight(!1);var f={height:this.$container.outerHeight(!1)};f.top=e.top,f.bottom=e.top+f.height;var g={height:this.$dropdown.outerHeight(!1)},h={top:a.scrollTop(),bottom:a.scrollTop()+a.height()},i=h.top<e.top-g.height,j=h.bottom>e.bottom+g.height,k={left:e.left,top:f.bottom};b||c||(d="below"),j||!i||b?!i&&j&&b&&(d="below"):d="above",("above"==d||b)&&(k.top=f.top-g.height),null!=d&&(this.$dropdown.removeClass("select2-dropdown--below select2-dropdown--above").addClass("select2-dropdown--"+d),this.$container.removeClass("select2-container--below select2-container--above").addClass("select2-container--"+d)),this.$dropdownContainer.css(k)},a.prototype._showDropdown=function(){this.$dropdownContainer.appendTo(this.$dropdownParent),this._positionDropdown()},a}),c("select2/dropdown/minimumResultsForSearch",[],function(){function a(b){count=0;for(var c=0;c<b.length;c++){var d=b[c];d.children?count+=a(d.children):count++}return count}function b(a,b,c,d){this.minimumResultsForSearch=c.get("minimumResultsForSearch"),a.call(this,b,c,d)}return b.prototype.showSearch=function(b,c){return a(c.data)<this.minimumResultsForSearch?!1:b.call(this,c)},b}),c("select2/i18n/en",[],function(){return{errorLoading:function(){return"The results could not be loaded."},inputTooLong:function(a){var b=a.input.length-a.maximum,c="Please delete "+b+" character";return 1!=b&&(c+="s"),c},inputTooShort:function(a){var b=a.minimum-a.input.length,c="Please enter "+b+" or more characters";return c},loadingMore:function(){return"Loading more results…"},maximumSelected:function(a){var b="You can only select "+a.maximum+" item";return 1!=a.maximum&&(b+="s"),b},noResults:function(){return"No results found"},searching:function(){return"Searching…"}}}),c("select2/defaults",["jquery","./results","./selection/single","./selection/multiple","./selection/placeholder","./selection/allowClear","./selection/search","./utils","./translation","./diacritics","./data/select","./data/array","./data/ajax","./data/tags","./data/minimumInputLength","./data/maximumInputLength","./dropdown","./dropdown/search","./dropdown/hidePlaceholder","./dropdown/infiniteScroll","./dropdown/attachBody","./dropdown/minimumResultsForSearch","./i18n/en"],function(a,b,c,d,e,f,g,h,i,j,k,l,m,n,o,p,q,r,s,t,u,v,w){function x(){this.reset()}x.prototype.apply=function(j){if(j=a.extend({},this.defaults,j),null==j.dataAdapter&&(j.dataAdapter=null!=j.ajax?m:null!=j.data?l:k,j.minimumInputLength>0&&(j.dataAdapter=h.Decorate(j.dataAdapter,o)),j.maximumInputLength>0&&(j.dataAdapter=h.Decorate(j.dataAdapter,p)),null!=j.tags&&(j.dataAdapter=h.Decorate(j.dataAdapter,n))),null==j.resultsAdapter&&(j.resultsAdapter=b,null!=j.ajax&&(j.resultsAdapter=h.Decorate(j.resultsAdapter,t)),null!=j.placeholder&&(j.resultsAdapter=h.Decorate(j.resultsAdapter,s))),null==j.dropdownAdapter){if(j.multiple)j.dropdownAdapter=q;else{var w=h.Decorate(q,r);j.dropdownAdapter=w}j.minimumResultsForSearch>0&&(j.dropdownAdapter=h.Decorate(j.dropdownAdapter,v)),j.dropdownAdapter=h.Decorate(j.dropdownAdapter,u)}if(null==j.selectionAdapter&&(j.selectionAdapter=j.multiple?d:c,null!=j.placeholder&&(j.selectionAdapter=h.Decorate(j.selectionAdapter,e),j.allowClear&&(j.selectionAdapter=h.Decorate(j.selectionAdapter,f))),j.multiple&&(j.selectionAdapter=h.Decorate(j.selectionAdapter,g))),"string"==typeof j.language&&(j.language=[j.language]),a.isArray(j.language)){var x=new i;j.language.push("en");for(var y=j.language,z=0;z<y.length;z++){var A=y[z],B={};try{B=i.loadPath(A)}catch(C){A="select2/i18n/"+A,B=i.loadPath(A)}x.extend(B)}j.translations=x}else j.translations=new i(j.language);return j},x.prototype.reset=function(){function b(a){function b(a){return j[a]||a}return a.replace(/[^\u0000-\u007E]/g,b)}function c(d,e){if(""===a.trim(d.term))return e;if(e.children&&e.children.length>0){for(var f=a.extend(!0,{},e),g=e.children.length-1;g>=0;g--){var h=e.children[g],i=c(d,h);null==i&&f.children.splice(g,1)}return f.children.length>0?f:c(d,f)}var j=b(e.text).toUpperCase(),k=b(d.term).toUpperCase();return j.indexOf(k)>-1?e:null}this.defaults={language:w,matcher:c,sorter:function(a){return a},minimumInputLength:0,maximumInputLength:0,minimumResultsForSearch:0,templateResult:function(a){return a.text},templateSelection:function(a){return a.text},theme:"default"}};var y=new x;return y}),c("select2/options",["jquery","./defaults"],function(a,b){function c(a,c){this.options=a,null!=c&&this.fromElement(c),this.options=b.apply(this.options)}return c.prototype.fromElement=function(b){function c(a){for(var b in a){var c=b.split("-"),d=a;if(1!==c.length){for(var e=0;e<c.length;e++){var f=c[e];f=f.substring(0,1).toLowerCase()+f.substring(1),f in d||(d[f]={}),e==c.length-1&&(d[f]=a[b]),d=d[f]}delete a[b]}}return a}var d=["select2"];null==this.options.multiple&&(this.options.multiple=b.prop("multiple")),null==this.options.disabled&&(this.options.disabled=b.prop("disabled")),null==this.options.language&&(b.prop("lang")?this.options.language=b.prop("lang").toLowerCase():b.closest("[lang]").prop("lang")&&(this.options.language=b.closest("[lang]").prop("lang"))),null==this.options.dir&&(this.options.dir=b.prop("dir")?b.prop("dir"):b.closest("[dir]").prop("dir")?b.closest("[dir]").prop("dir"):"ltr"),b.prop("disabled",this.options.disabled),b.prop("multiple",this.options.multiple),b.data("select2-tags")&&(console&&console.warn&&console.warn('Select2: The `data-select2-tags` attribute has been changed to use the `data-data` and `data-tags="true"` attributes and will be removed in future versions of Select2.'),b.data("data",b.data("select2-tags")),b.data("tags",!0)),b.data("ajax-url")&&(console&&console.warn&&console.warn("Select2: The `data-ajax-attribute` has been changed to `data-ajax--url` and support for the old attribute will be removed in future versions of Select2."),b.data("ajax--url",b.data("ajax-url")));var e=b.data();e=c(e);for(var f in e)d.indexOf(f)>-1||(a.isPlainObject(this.options[f])?a.extend(this.options[f],e[f]):this.options[f]=e[f]);return this},c.prototype.get=function(a){return this.options[a]},c.prototype.set=function(a,b){this.options[a]=b},c}),c("select2/core",["jquery","./options","./utils","./keys"],function(a,b,c,d){var e=function(a,c){null!=a.data("select2")&&a.data("select2").destroy(),this.$element=a,this.id=this._generateId(a),c=c||{},this.options=new b(c,a),e.__super__.constructor.call(this);var d=this.options.get("dataAdapter");this.data=new d(a,this.options);var f=this.render();this._placeContainer(f);var g=this.options.get("selectionAdapter");this.selection=new g(a,this.options),this.$selection=this.selection.render(),this.selection.position(this.$selection,f);var h=this.options.get("dropdownAdapter");this.dropdown=new h(a,this.options),this.$dropdown=this.dropdown.render(),this.dropdown.position(this.$dropdown,f);var i=this.options.get("resultsAdapter");this.results=new i(a,this.options,this.data),this.$results=this.results.render(),this.results.position(this.$results,this.$dropdown);var j=this;
+this._bindAdapters(),this._registerDomEvents(),this._registerDataEvents(),this._registerSelectionEvents(),this._registerDropdownEvents(),this._registerResultsEvents(),this._registerEvents(),this.data.current(function(a){j.trigger("selection:update",{data:a})}),a.hide(),this._syncAttributes(),this._tabindex=a.attr("tabindex")||0,a.attr("tabindex","-1"),a.data("select2",this)};return c.Extend(e,c.Observable),e.prototype._generateId=function(a){var b="";return b=null!=a.attr("id")?a.attr("id"):null!=a.attr("name")?a.attr("name")+"-"+c.generateChars(2):c.generateChars(4),b="select2-"+b},e.prototype._placeContainer=function(a){a.insertAfter(this.$element),a.width(this.$element.outerWidth(!1))},e.prototype._bindAdapters=function(){this.data.bind(this,this.$container),this.selection.bind(this,this.$container),this.dropdown.bind(this,this.$container),this.results.bind(this,this.$container)},e.prototype._registerDomEvents=function(){var b=this;this.$element.on("change.select2",function(){b.data.current(function(a){b.trigger("selection:update",{data:a})})}),this._sync=c.bind(this._syncAttributes,this),this.$element[0].attachEvent&&this.$element[0].attachEvent("onpropertychange",this._sync);var d=window.MutationObserver||window.WebKitMutationObserver||window.MozMutationObserver;null!=d&&(this._observer=new d(function(c){a.each(c,b._sync)}),this._observer.observe(this.$element[0],{attributes:!0,subtree:!1}))},e.prototype._registerDataEvents=function(){var a=this;this.data.on("results:message",function(b){a.trigger("results:message",b)})},e.prototype._registerSelectionEvents=function(){var a=this;this.selection.on("open",function(){a.open()}),this.selection.on("close",function(){a.close()}),this.selection.on("toggle",function(){a.toggleDropdown()}),this.selection.on("results:select",function(){a.trigger("results:select")}),this.selection.on("results:previous",function(){a.trigger("results:previous")}),this.selection.on("results:next",function(){a.trigger("results:next")}),this.selection.on("unselected",function(b){a.trigger("unselect",b),a.close()}),this.selection.on("query",function(b){a.trigger("query",b)}),this.selection.on("keypress",function(b){a.trigger("keypress",b)})},e.prototype._registerDropdownEvents=function(){var a=this;this.dropdown.on("query",function(b){a.trigger("query",b)}),this.dropdown.on("keypress",function(b){a.trigger("keypress",b)})},e.prototype._registerResultsEvents=function(){var a=this;this.results.on("query:append",function(b){a.trigger("query:append",b)}),this.results.on("selected",function(b){a.trigger("select",b),a.close()}),this.results.on("unselected",function(b){a.trigger("unselect",b),a.close()}),this.results.on("results:focus",function(b){a.trigger("results:focus",b)})},e.prototype._registerEvents=function(){var a=this;this.on("open",function(){a.$container.addClass("select2-container--open")}),this.on("close",function(){a.$container.removeClass("select2-container--open")}),this.on("enable",function(){a.$container.removeClass("select2-container--disabled")}),this.on("disable",function(){a.$container.addClass("select2-container--disabled")}),this.on("query",function(b){this.data.query(b,function(c){a.trigger("results:all",{data:c,query:b})})}),this.on("query:append",function(b){this.data.query(b,function(c){a.trigger("results:append",{data:c,query:b})})}),this.on("keypress",function(b){var c=b.which;a.isOpen()?c===d.ENTER?(a.trigger("results:select"),b.preventDefault()):c===d.UP?(a.trigger("results:previous"),b.preventDefault()):c===d.DOWN?(a.trigger("results:next"),b.preventDefault()):(c===d.ESC||c===d.TAB)&&(a.close(),b.preventDefault()):(c===d.ENTER||c===d.SPACE||(c===d.DOWN||c===d.UP)&&b.altKey)&&(a.open(),b.preventDefault())})},e.prototype._syncAttributes=function(){this.options.set("disabled",this.$element.prop("disabled")),this.options.get("disabled")?(this.isOpen()&&this.trigger("close"),this.trigger("disable")):this.trigger("enable")},e.prototype.toggleDropdown=function(){this.options.get("disabled")||(this.isOpen()?this.close():this.open())},e.prototype.open=function(){this.isOpen()||(this.trigger("query",{}),this.trigger("open"))},e.prototype.close=function(){this.isOpen()&&this.trigger("close")},e.prototype.isOpen=function(){return this.$container.hasClass("select2-container--open")},e.prototype.enable=function(a){console&&console.warn&&console.warn('Select2: The `select2("val")` method has been deprecated and will be removed in later Select2 versions. Use $element.prop("disabled") instead.'),0===a.length&&(a=[!0]);var b=!a[0];this.$element.prop("disabled",b)},e.prototype.val=function(b){if(console&&console.warn&&console.warn('Select2: The `select2("val")` method has been deprecated and will be removed in later Select2 versions. Use $element.val() instead.'),0===b.length)return this.$element.val();var c=b[0];a.isArray(c)&&(c=a.map(c,function(a){return a.toString()})),this.$element.val(c).trigger("change")},e.prototype.destroy=function(){this.$container.remove(),this.$element[0].detachEvent&&this.$element[0].detachEvent("onpropertychange",this._sync),null!=this._observer&&(this._observer.disconnect(),this._observer=null),this._sync=null,this.$element.off(".select2"),this.$element.attr("tabindex",this._tabindex),this.$element.show(),this.$element.removeData("select2"),this.data.destroy(),this.selection.destroy(),this.dropdown.destroy(),this.results.destroy(),this.data=null,this.selection=null,this.dropdown=null,this.results=null},e.prototype.render=function(){var b=a('<span class="select2 select2-container"><span class="selection"></span><span class="dropdown-wrapper" aria-hidden="true"></span></span>');return b.attr("dir",this.options.get("dir")),this.$container=b,this.$container.addClass("select2-container--"+this.options.get("theme")),b.data("element",this.$element),b},e}),function(a){"function"==typeof c&&c.amd?c("jquery.mousewheel",["jquery"],a):"object"==typeof exports?module.exports=a:a(jQuery)}(function(a){function b(b){var g=b||window.event,h=i.call(arguments,1),j=0,l=0,m=0,n=0,o=0,p=0;if(b=a.event.fix(g),b.type="mousewheel","detail"in g&&(m=-1*g.detail),"wheelDelta"in g&&(m=g.wheelDelta),"wheelDeltaY"in g&&(m=g.wheelDeltaY),"wheelDeltaX"in g&&(l=-1*g.wheelDeltaX),"axis"in g&&g.axis===g.HORIZONTAL_AXIS&&(l=-1*m,m=0),j=0===m?l:m,"deltaY"in g&&(m=-1*g.deltaY,j=m),"deltaX"in g&&(l=g.deltaX,0===m&&(j=-1*l)),0!==m||0!==l){if(1===g.deltaMode){var q=a.data(this,"mousewheel-line-height");j*=q,m*=q,l*=q}else if(2===g.deltaMode){var r=a.data(this,"mousewheel-page-height");j*=r,m*=r,l*=r}if(n=Math.max(Math.abs(m),Math.abs(l)),(!f||f>n)&&(f=n,d(g,n)&&(f/=40)),d(g,n)&&(j/=40,l/=40,m/=40),j=Math[j>=1?"floor":"ceil"](j/f),l=Math[l>=1?"floor":"ceil"](l/f),m=Math[m>=1?"floor":"ceil"](m/f),k.settings.normalizeOffset&&this.getBoundingClientRect){var s=this.getBoundingClientRect();o=b.clientX-s.left,p=b.clientY-s.top}return b.deltaX=l,b.deltaY=m,b.deltaFactor=f,b.offsetX=o,b.offsetY=p,b.deltaMode=0,h.unshift(b,j,l,m),e&&clearTimeout(e),e=setTimeout(c,200),(a.event.dispatch||a.event.handle).apply(this,h)}}function c(){f=null}function d(a,b){return k.settings.adjustOldDeltas&&"mousewheel"===a.type&&b%120===0}var e,f,g=["wheel","mousewheel","DOMMouseScroll","MozMousePixelScroll"],h="onwheel"in document||document.documentMode>=9?["wheel"]:["mousewheel","DomMouseScroll","MozMousePixelScroll"],i=Array.prototype.slice;if(a.event.fixHooks)for(var j=g.length;j;)a.event.fixHooks[g[--j]]=a.event.mouseHooks;var k=a.event.special.mousewheel={version:"3.1.12",setup:function(){if(this.addEventListener)for(var c=h.length;c;)this.addEventListener(h[--c],b,!1);else this.onmousewheel=b;a.data(this,"mousewheel-line-height",k.getLineHeight(this)),a.data(this,"mousewheel-page-height",k.getPageHeight(this))},teardown:function(){if(this.removeEventListener)for(var c=h.length;c;)this.removeEventListener(h[--c],b,!1);else this.onmousewheel=null;a.removeData(this,"mousewheel-line-height"),a.removeData(this,"mousewheel-page-height")},getLineHeight:function(b){var c=a(b),d=c["offsetParent"in a.fn?"offsetParent":"parent"]();return d.length||(d=a("body")),parseInt(d.css("fontSize"),10)||parseInt(c.css("fontSize"),10)||16},getPageHeight:function(b){return a(b).height()},settings:{adjustOldDeltas:!0,normalizeOffset:!0}};a.fn.extend({mousewheel:function(a){return a?this.bind("mousewheel",a):this.trigger("mousewheel")},unmousewheel:function(a){return this.unbind("mousewheel",a)}})}),c("select2/compat/matcher",[],function(){function a(a){function b(b,c){var d=$.extend(!0,{},c);if(null==b.term||""===$.trim(b.term))return d;if(c.children){for(var e=c.children.length-1;e>=0;e--){var f=c.children[e],g=a(b.term,f.text,f);g||d.children.splice(e,1)}if(d.children.length>0)return d}return a(b.term,c.text,c)?d:null}return b}return a}),c("select2/dropdown/attachContainer",[],function(){function a(a,b,c){a.call(this,b,c)}return a.prototype.position=function(a,b,c){var d=c.find(".dropdown-wrapper");d.append(b),b.addClass("select2-dropdown--below"),c.addClass("select2-container--below")},a}),c("jquery.select2",["jquery","select2/core"],function(a,c){try{b("jquery.mousewheel")}catch(d){}return null==a.fn.select2&&(a.fn.select2=function(b){if(b=b||{},"object"==typeof b)return this.each(function(){{var d=a.extend({},b,!0);new c(a(this),d)}}),this;if("string"==typeof b){var d=this.data("select2"),e=Array.prototype.slice.call(arguments,1);return d[b](e)}throw new Error("Invalid arguments for Select2: "+b)}),c}),b("jquery.select2"),$.fn.select2.amd={define:c,require:b}}();
\ No newline at end of file
diff --git a/dist/js/select2.js b/dist/js/select2.js
index d82b7d95..417489b8 100644
--- a/dist/js/select2.js
+++ b/dist/js/select2.js
@@ -591,8 +591,9 @@ define('select2/utils',[], function () {
 });
 
 define('select2/results',[
+  'jquery',
   './utils'
-], function (Utils) {
+], function ($, Utils) {
   function Results ($element, options, dataAdapter) {
     this.$element = $element;
     this.data = dataAdapter;
@@ -958,6 +959,33 @@ define('select2/results',[
       self.displayMessage(params);
     });
 
+    if ($.fn.mousewheel) {
+      this.$results.on('mousewheel', function (e) {
+        var top = self.$results.scrollTop();
+
+        var bottom = (
+          self.$results.get(0).scrollHeight -
+          self.$results.scrollTop() +
+          e.deltaY
+        );
+
+        var isAtTop = e.deltaY > 0 && top - e.deltaY <= 0;
+        var isAtBottom = e.deltaY < 0 && bottom <= self.$results.height();
+
+        if (isAtTop) {
+          self.$results.scrollTop(0);
+          e.preventDefault();
+          e.stopPropagation();
+        } else if (isAtBottom) {
+          self.$results.scrollTop(
+            self.$results.get(0).scrollHeight - self.$results.height()
+          );
+          e.preventDefault();
+          e.stopPropagation();
+        }
+      });
+    }
+
     this.$results.on('mouseup', '.select2-results__option[aria-selected]',
       function (evt) {
       var $this = $(this);
@@ -4433,6 +4461,11 @@ define('jquery.select2',[
   'jquery',
   'select2/core'
 ], function ($, Select2) {
+  // Force jQuery.mousewheel to be loaded if it hasn't already
+  try {
+    require('jquery.mousewheel');
+  } catch (Exception) { }
+
   if ($.fn.select2 == null) {
     $.fn.select2 = function (options) {
       options = options || {};
diff --git a/dist/js/select2.min.js b/dist/js/select2.min.js
index 3c79c9c2..6f67cb11 100644
--- a/dist/js/select2.min.js
+++ b/dist/js/select2.min.js
@@ -1,2 +1,2 @@
-window.$=window.$||{},function(){$&&$.fn&&$.fn.select2&&$.fn.select2.amd&&(c=$.fn.select2.amd.define,b=$.fn.select2.amd.require);var a,b,c;!function(d){function e(a,b){return u.call(a,b)}function f(a,b){var c,d,e,f,g,h,i,j,k,l,m,n=b&&b.split("/"),o=s.map,p=o&&o["*"]||{};if(a&&"."===a.charAt(0))if(b){for(n=n.slice(0,n.length-1),a=a.split("/"),g=a.length-1,s.nodeIdCompat&&w.test(a[g])&&(a[g]=a[g].replace(w,"")),a=n.concat(a),k=0;k<a.length;k+=1)if(m=a[k],"."===m)a.splice(k,1),k-=1;else if(".."===m){if(1===k&&(".."===a[2]||".."===a[0]))break;k>0&&(a.splice(k-1,2),k-=2)}a=a.join("/")}else 0===a.indexOf("./")&&(a=a.substring(2));if((n||p)&&o){for(c=a.split("/"),k=c.length;k>0;k-=1){if(d=c.slice(0,k).join("/"),n)for(l=n.length;l>0;l-=1)if(e=o[n.slice(0,l).join("/")],e&&(e=e[d])){f=e,h=k;break}if(f)break;!i&&p&&p[d]&&(i=p[d],j=k)}!f&&i&&(f=i,h=j),f&&(c.splice(0,h,f),a=c.join("/"))}return a}function g(a,b){return function(){return n.apply(d,v.call(arguments,0).concat([a,b]))}}function h(a){return function(b){return f(b,a)}}function i(a){return function(b){q[a]=b}}function j(a){if(e(r,a)){var b=r[a];delete r[a],t[a]=!0,m.apply(d,b)}if(!e(q,a)&&!e(t,a))throw new Error("No "+a);return q[a]}function k(a){var b,c=a?a.indexOf("!"):-1;return c>-1&&(b=a.substring(0,c),a=a.substring(c+1,a.length)),[b,a]}function l(a){return function(){return s&&s.config&&s.config[a]||{}}}var m,n,o,p,q={},r={},s={},t={},u=Object.prototype.hasOwnProperty,v=[].slice,w=/\.js$/;o=function(a,b){var c,d=k(a),e=d[0];return a=d[1],e&&(e=f(e,b),c=j(e)),e?a=c&&c.normalize?c.normalize(a,h(b)):f(a,b):(a=f(a,b),d=k(a),e=d[0],a=d[1],e&&(c=j(e))),{f:e?e+"!"+a:a,n:a,pr:e,p:c}},p={require:function(a){return g(a)},exports:function(a){var b=q[a];return"undefined"!=typeof b?b:q[a]={}},module:function(a){return{id:a,uri:"",exports:q[a],config:l(a)}}},m=function(a,b,c,f){var h,k,l,m,n,s,u=[],v=typeof c;if(f=f||a,"undefined"===v||"function"===v){for(b=!b.length&&c.length?["require","exports","module"]:b,n=0;n<b.length;n+=1)if(m=o(b[n],f),k=m.f,"require"===k)u[n]=p.require(a);else if("exports"===k)u[n]=p.exports(a),s=!0;else if("module"===k)h=u[n]=p.module(a);else if(e(q,k)||e(r,k)||e(t,k))u[n]=j(k);else{if(!m.p)throw new Error(a+" missing "+k);m.p.load(m.n,g(f,!0),i(k),{}),u[n]=q[k]}l=c?c.apply(q[a],u):void 0,a&&(h&&h.exports!==d&&h.exports!==q[a]?q[a]=h.exports:l===d&&s||(q[a]=l))}else a&&(q[a]=c)},a=b=n=function(a,b,c,e,f){if("string"==typeof a)return p[a]?p[a](b):j(o(a,b).f);if(!a.splice){if(s=a,s.deps&&n(s.deps,s.callback),!b)return;b.splice?(a=b,b=c,c=null):a=d}return b=b||function(){},"function"==typeof c&&(c=e,e=f),e?m(d,a,b,c):setTimeout(function(){m(d,a,b,c)},4),n},n.config=function(a){return n(a)},a._defined=q,c=function(a,b,c){b.splice||(c=b,b=[]),e(q,a)||e(r,a)||(r[a]=[a,b,c])},c.amd={jQuery:!0}}(),c("almond",function(){}),c("jquery",[],function(){return jQuery}),c("select2/utils",[],function(){function a(a){var b=a.prototype,c=[];for(var d in b){var e=b[d];"function"==typeof e&&"constructor"!==d&&c.push(d)}return c}var b={};b.Extend=function(a,b){function c(){this.constructor=a}var d={}.hasOwnProperty;for(var e in b)d.call(b,e)&&(a[e]=b[e]);return c.prototype=b.prototype,a.prototype=new c,a.__super__=b.prototype,a},b.Decorate=function(b,c){function d(){var a=Array.prototype.unshift,d=c.prototype.constructor.length,e=b.prototype.constructor;d>0&&(a.call(arguments,b.prototype.constructor),e=c.prototype.constructor),e.apply(this,arguments)}function e(){this.constructor=d}var f=a(c),g=a(b);c.displayName=b.displayName,d.prototype=new e;for(var h=0;h<g.length;h++){var i=g[h];d.prototype[i]=b.prototype[i]}for(var j=(function(a){var b=function(){};a in d.prototype&&(b=d.prototype[a]);var e=c.prototype[a];return function(){var a=Array.prototype.unshift;return a.call(arguments,b),e.apply(this,arguments)}}),k=0;k<f.length;k++){var l=f[k];d.prototype[l]=j(l)}return d};var c=function(){this.listeners={}};return c.prototype.on=function(a,b){this.listeners=this.listeners||{},a in this.listeners?this.listeners[a].push(b):this.listeners[a]=[b]},c.prototype.trigger=function(a){var b=Array.prototype.slice;this.listeners=this.listeners||{},a in this.listeners&&this.invoke(this.listeners[a],b.call(arguments,1)),"*"in this.listeners&&this.invoke(this.listeners["*"],arguments)},c.prototype.invoke=function(a,b){for(var c=0,d=a.length;d>c;c++)a[c].apply(this,b)},b.Observable=c,b.generateChars=function(a){for(var b="",c=0;a>c;c++){var d=Math.floor(36*Math.random());b+=d.toString(36)}return b},b.bind=function(a,b){return function(){a.apply(b,arguments)}},b}),c("select2/results",["./utils"],function(a){function b(a,c,d){this.$element=a,this.data=d,this.options=c,b.__super__.constructor.call(this)}return a.Extend(b,a.Observable),b.prototype.render=function(){var a=$('<ul class="select2-results__options" role="tree"></ul>');return this.options.get("multiple")&&a.attr("aria-multiselectable","true"),this.$results=a,a},b.prototype.clear=function(){this.$results.empty()},b.prototype.displayMessage=function(a){this.clear(),this.hideLoading();var b=$('<li role="treeitem" class="select2-results__option"></li>'),c=this.options.get("translations").get(a.message);b.text(c(a.args)),this.$results.append(b)},b.prototype.append=function(a){this.hideLoading();var b=[];if(0===a.length)return void(0===this.$results.children().length&&this.trigger("results:message",{message:"noResults"}));a=this.sort(a);for(var c=0;c<a.length;c++){var d=a[c],e=this.option(d);b.push(e)}this.$results.append(b)},b.prototype.position=function(a,b){var c=b.find(".select2-results");c.append(a)},b.prototype.sort=function(a){var b=this.options.get("sorter");return b(a)},b.prototype.setClasses=function(){var a=this;this.data.current(function(b){var c=$.map(b,function(a){return a.id.toString()}),d=a.$results.find(".select2-results__option[aria-selected]");d.each(function(){var a=$(this),b=$.data(this,"data");null!=b.id&&c.indexOf(b.id.toString())>-1?a.attr("aria-selected","true"):a.attr("aria-selected","false")});var e=d.filter("[aria-selected=true]");e.length>0?e.first().trigger("mouseenter"):d.first().trigger("mouseenter")})},b.prototype.showLoading=function(a){this.hideLoading();var b=this.options.get("translations").get("searching"),c={disabled:!0,loading:!0,text:b(a)},d=this.option(c);d.className+=" loading-results",this.$results.prepend(d)},b.prototype.hideLoading=function(){this.$results.find(".loading-results").remove()},b.prototype.option=function(a){var b=document.createElement("li");b.className="select2-results__option";var c={role:"treeitem","aria-selected":"false"};a.disabled&&(delete c["aria-selected"],c["aria-disabled"]="true"),null==a.id&&delete c["aria-selected"],null!=a._resultId&&(b.id=a._resultId),a.children&&(c.role="group",c["aria-label"]=a.text,delete c["aria-selected"]);for(var d in c){var e=c[d];b.setAttribute(d,e)}if(a.children){var f=$(b),g=document.createElement("strong");g.className="select2-results__group";{$(g)}this.template(a,g);for(var h=[],i=0;i<a.children.length;i++){var j=a.children[i],k=this.option(j);h.push(k)}var l=$("<ul></ul>",{"class":"select2-results__options select2-results__options--nested"});l.append(h),f.append(g),f.append(l)}else this.template(a,b);return $.data(b,"data",a),b},b.prototype.bind=function(a){var 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a=b.getHighlightedResults(),c=b.$results.find("[aria-selected]"),d=c.index(a);if(0!==d){var e=d-1;0===a.length&&(e=0);var f=c.eq(e);f.trigger("mouseenter");var g=b.$results.offset().top,h=f.offset().top,i=b.$results.scrollTop()+(h-g);0===e?b.$results.scrollTop(0):0>h-g&&b.$results.scrollTop(i)}}),a.on("results:next",function(){var a=b.getHighlightedResults(),c=b.$results.find("[aria-selected]"),d=c.index(a),e=d+1;if(!(e>=c.length)){var f=c.eq(e);f.trigger("mouseenter");var g=b.$results.offset().top+b.$results.outerHeight(!1),h=f.offset().top+f.outerHeight(!1),i=b.$results.scrollTop()+h-g;0===e?b.$results.scrollTop(0):h>g&&b.$results.scrollTop(i)}}),a.on("results:focus",function(a){a.element.addClass("select2-results__option--highlighted")}),a.on("results:message",function(a){b.trigger("results:message",a)}),this.on("results:message",function(a){b.displayMessage(a)}),this.$results.on("mouseup",".select2-results__option[aria-selected]",function(a){var 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c=this.options.get("templateResult");b.innerHTML=c(a)},b}),c("select2/keys",[],function(){var a={BACKSPACE:8,TAB:9,ENTER:13,SHIFT:16,CTRL:17,ALT:18,ESC:27,SPACE:32,PAGE_UP:33,PAGE_DOWN:34,END:35,HOME:36,LEFT:37,UP:38,RIGHT:39,DOWN:40,DELETE:46,isArrow:function(a){switch(a=a.which?a.which:a){case KEY.LEFT:case KEY.RIGHT:case KEY.UP:case KEY.DOWN:return!0}return!1}};return a}),c("select2/selection/base",["../utils","../keys"],function(a,b){function c(a,b){this.$element=a,this.options=b,c.__super__.constructor.call(this)}return a.Extend(c,a.Observable),c.prototype.render=function(){throw new Error("The `render` method must be defined in child classes.")},c.prototype.bind=function(a){var 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c=$(this),d=c.parent(),e=d.data("data");b.trigger("unselected",{originalEvent:a,data:e})}),a.on("enable",function(){b.$selection.attr("tabindex","0")}),a.on("disable",function(){b.$selection.attr("tabindex","-1")})},c.prototype.clear=function(){this.$selection.find(".select2-selection__rendered").empty()},c.prototype.display=function(a){var b=this.options.get("templateSelection");return b(a)},c.prototype.selectionContainer=function(){var a=$('<li class="select2-selection__choice"><span class="select2-selection__choice__remove" role="presentation">&times;</span></li>');return a},c.prototype.update=function(a){if(this.clear(),0!==a.length){for(var b=[],c=0;c<a.length;c++){var d=a[c],e=this.display(d),f=this.selectionContainer();f.append(e),f.data("data",d),b.push(f)}this.$selection.find(".select2-selection__rendered").append(b)}},c}),c("select2/selection/placeholder",["../utils"],function(){function 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b=a.call(this),c=$('<span class="select2-search select2-search--dropdown"><input class="select2-search__field" type="search" tabindex="-1" role="textbox" /></span>');return this.$searchContainer=c,this.$search=c.find("input"),b.prepend(c),b},a.prototype.bind=function(a,b,c){var d=this;a.call(this,b,c),this.$search.on("keydown",function(a){d.trigger("keypress",a),d._keyUpPrevented=a.isDefaultPrevented()}),this.$search.on("keyup",function(a){d.handleSearch(a)}),b.on("open",function(){d.$search.attr("tabindex",0),d.$search.focus()}),b.on("close",function(){d.$search.attr("tabindex",-1),d.$search.val("")}),b.on("results:all",function(a){if(null==a.query.term||""===a.query.term){var b=d.showSearch(a);b?d.$searchContainer.removeClass("select2-search--hide"):d.$searchContainer.addClass("select2-search--hide")}})},a.prototype.handleSearch=function(){if(!this._keyUpPrevented){var a=this.$search.val();this.trigger("query",{term:a})}this._keyUpPrevented=!1},a.prototype.showSearch=function(){return!0},a}),c("select2/dropdown/hidePlaceholder",[],function(){function a(a,b,c,d){this.placeholder=this.normalizePlaceholder(c.get("placeholder")),a.call(this,b,c,d)}return a.prototype.append=function(a,b){b=this.removePlaceholder(b),a.call(this,b)},a.prototype.normalizePlaceholder=function(a,b){return"string"==typeof b&&(b={id:"",text:b}),b},a.prototype.removePlaceholder=function(a,b){for(var c=b.slice(0),d=b.length-1;d>=0;d--){var e=b[d];this.placeholder.id===e.id&&c.splice(d,1)}return c},a}),c("select2/dropdown/infiniteScroll",["jquery"],function(a){function b(a,b,c,d){this.lastParams={},a.call(this,b,c,d),this.$loadingMore=this.createLoadingMore(),this.loading=!1}return b.prototype.append=function(b,c){return this.$loadingMore.remove(),this.loading=!1,a.isArray(c)?void b.call(this,c):(b.call(this,c.results),void(this.showLoadingMore(c)&&this.$results.append(this.$loadingMore)))},b.prototype.bind=function(b,c,d){var e=this;b.call(this,c,d),c.on("query",function(a){e.lastParams=a,e.loading=!0}),c.on("query:append",function(a){e.lastParams=a,e.loading=!0}),this.$results.on("scroll",function(){var b=a.contains(document.documentElement,e.$loadingMore[0]);if(!e.loading&&b){var c=e.$results.offset().top+e.$results.outerHeight(!1),d=e.$loadingMore.offset().top+e.$loadingMore.outerHeight(!1);c+50>=d&&e.loadMore()}})},b.prototype.loadMore=function(){this.loading=!0;var b=a.extend({},{page:1},this.lastParams);b.page++,this.trigger("query:append",b)},b.prototype.showLoadingMore=function(a,b){return b.pagination&&b.pagination.more},b.prototype.createLoadingMore=function(){var b=a('<li class="option load-more" role="treeitem"></li>'),c=this.options.get("translations").get("loadingMore");return b.html(c(this.lastParams)),b},b}),c("select2/dropdown/attachBody",[],function(){function a(a,b,c){this.$dropdownParent=c.get("dropdownParent")||document.body,a.call(this,b,c)}return a.prototype.bind=function(a,b,c){var d=this,e=!1;a.call(this,b,c),b.on("open",function(){d._showDropdown(),e||(e=!0,b.on("results:all",function(){d._positionDropdown()}),b.on("results:append",function(){d._positionDropdown()}))}),b.on("close",function(){d._hideDropdown()}),this.$dropdownContainer.on("mousedown",function(a){a.stopPropagation()})},a.prototype.position=function(a,b,c){b.attr("class",c.attr("class")),b.removeClass("select2"),b.addClass("select2-container--open"),b.css({position:"absolute"}),b.width(c.outerWidth(!1)),this.$container=c},a.prototype.render=function(a){var b=$("<span></span>"),c=a.call(this);return b.append(c),this.$dropdownContainer=b,b},a.prototype._hideDropdown=function(){this.$dropdownContainer.detach()},a.prototype._positionDropdown=function(){var a=$(window),b=this.$dropdown.hasClass("select2-dropdown--above"),c=this.$dropdown.hasClass("select2-dropdown--below"),d=null,e=(this.$container.position(),this.$container.offset());e.bottom=e.top+this.$container.outerHeight(!1);var f={height:this.$container.outerHeight(!1)};f.top=e.top,f.bottom=e.top+f.height;var g={height:this.$dropdown.outerHeight(!1)},h={top:a.scrollTop(),bottom:a.scrollTop()+a.height()},i=h.top<e.top-g.height,j=h.bottom>e.bottom+g.height,k={left:e.left,top:f.bottom};b||c||(d="below"),j||!i||b?!i&&j&&b&&(d="below"):d="above",("above"==d||b)&&(k.top=f.top-g.height),null!=d&&(this.$dropdown.removeClass("select2-dropdown--below select2-dropdown--above").addClass("select2-dropdown--"+d),this.$container.removeClass("select2-container--below select2-container--above").addClass("select2-container--"+d)),this.$dropdownContainer.css(k)},a.prototype._showDropdown=function(){this.$dropdownContainer.appendTo(this.$dropdownParent),this._positionDropdown()},a}),c("select2/dropdown/minimumResultsForSearch",[],function(){function a(b){count=0;for(var c=0;c<b.length;c++){var d=b[c];d.children?count+=a(d.children):count++}return count}function b(a,b,c,d){this.minimumResultsForSearch=c.get("minimumResultsForSearch"),a.call(this,b,c,d)}return b.prototype.showSearch=function(b,c){return a(c.data)<this.minimumResultsForSearch?!1:b.call(this,c)},b}),c("select2/i18n/en",[],function(){return{errorLoading:function(){return"The results could not be loaded."},inputTooLong:function(a){var b=a.input.length-a.maximum,c="Please delete "+b+" character";return 1!=b&&(c+="s"),c},inputTooShort:function(a){var b=a.minimum-a.input.length,c="Please enter "+b+" or more characters";return c},loadingMore:function(){return"Loading more results…"},maximumSelected:function(a){var b="You can only select "+a.maximum+" item";return 1!=a.maximum&&(b+="s"),b},noResults:function(){return"No results found"},searching:function(){return"Searching…"}}}),c("select2/defaults",["jquery","./results","./selection/single","./selection/multiple","./selection/placeholder","./selection/allowClear","./selection/search","./utils","./translation","./diacritics","./data/select","./data/array","./data/ajax","./data/tags","./data/minimumInputLength","./data/maximumInputLength","./dropdown","./dropdown/search","./dropdown/hidePlaceholder","./dropdown/infiniteScroll","./dropdown/attachBody","./dropdown/minimumResultsForSearch","./i18n/en"],function(a,b,c,d,e,f,g,h,i,j,k,l,m,n,o,p,q,r,s,t,u,v,w){function x(){this.reset()}x.prototype.apply=function(j){if(j=a.extend({},this.defaults,j),null==j.dataAdapter&&(j.dataAdapter=null!=j.ajax?m:null!=j.data?l:k,j.minimumInputLength>0&&(j.dataAdapter=h.Decorate(j.dataAdapter,o)),j.maximumInputLength>0&&(j.dataAdapter=h.Decorate(j.dataAdapter,p)),null!=j.tags&&(j.dataAdapter=h.Decorate(j.dataAdapter,n))),null==j.resultsAdapter&&(j.resultsAdapter=b,null!=j.ajax&&(j.resultsAdapter=h.Decorate(j.resultsAdapter,t)),null!=j.placeholder&&(j.resultsAdapter=h.Decorate(j.resultsAdapter,s))),null==j.dropdownAdapter){if(j.multiple)j.dropdownAdapter=q;else{var w=h.Decorate(q,r);j.dropdownAdapter=w}j.minimumResultsForSearch>0&&(j.dropdownAdapter=h.Decorate(j.dropdownAdapter,v)),j.dropdownAdapter=h.Decorate(j.dropdownAdapter,u)}if(null==j.selectionAdapter&&(j.selectionAdapter=j.multiple?d:c,null!=j.placeholder&&(j.selectionAdapter=h.Decorate(j.selectionAdapter,e),j.allowClear&&(j.selectionAdapter=h.Decorate(j.selectionAdapter,f))),j.multiple&&(j.selectionAdapter=h.Decorate(j.selectionAdapter,g))),"string"==typeof j.language&&(j.language=[j.language]),a.isArray(j.language)){var x=new i;j.language.push("en");for(var y=j.language,z=0;z<y.length;z++){var A=y[z],B={};try{B=i.loadPath(A)}catch(C){A="select2/i18n/"+A,B=i.loadPath(A)}x.extend(B)}j.translations=x}else j.translations=new i(j.language);return j},x.prototype.reset=function(){function b(a){function b(a){return j[a]||a}return a.replace(/[^\u0000-\u007E]/g,b)}function c(d,e){if(""===a.trim(d.term))return e;if(e.children&&e.children.length>0){for(var f=a.extend(!0,{},e),g=e.children.length-1;g>=0;g--){var h=e.children[g],i=c(d,h);null==i&&f.children.splice(g,1)}return f.children.length>0?f:c(d,f)}var j=b(e.text).toUpperCase(),k=b(d.term).toUpperCase();return j.indexOf(k)>-1?e:null}this.defaults={language:w,matcher:c,sorter:function(a){return a},minimumInputLength:0,maximumInputLength:0,minimumResultsForSearch:0,templateResult:function(a){return a.text},templateSelection:function(a){return a.text},theme:"default"}};var y=new x;return y}),c("select2/options",["jquery","./defaults"],function(a,b){function c(a,c){this.options=a,null!=c&&this.fromElement(c),this.options=b.apply(this.options)}return c.prototype.fromElement=function(b){function c(a){for(var b in a){var c=b.split("-"),d=a;if(1!==c.length){for(var e=0;e<c.length;e++){var f=c[e];f=f.substring(0,1).toLowerCase()+f.substring(1),f in d||(d[f]={}),e==c.length-1&&(d[f]=a[b]),d=d[f]}delete a[b]}}return a}var d=["select2"];null==this.options.multiple&&(this.options.multiple=b.prop("multiple")),null==this.options.disabled&&(this.options.disabled=b.prop("disabled")),null==this.options.language&&(b.prop("lang")?this.options.language=b.prop("lang").toLowerCase():b.closest("[lang]").prop("lang")&&(this.options.language=b.closest("[lang]").prop("lang"))),null==this.options.dir&&(this.options.dir=b.prop("dir")?b.prop("dir"):b.closest("[dir]").prop("dir")?b.closest("[dir]").prop("dir"):"ltr"),b.prop("disabled",this.options.disabled),b.prop("multiple",this.options.multiple),b.data("select2-tags")&&(console&&console.warn&&console.warn('Select2: The `data-select2-tags` attribute has been changed to use the `data-data` and `data-tags="true"` attributes and will be removed in future versions of Select2.'),b.data("data",b.data("select2-tags")),b.data("tags",!0)),b.data("ajax-url")&&(console&&console.warn&&console.warn("Select2: The `data-ajax-attribute` has been changed to `data-ajax--url` and support for the old attribute will be removed in future versions of Select2."),b.data("ajax--url",b.data("ajax-url")));var e=b.data();e=c(e);for(var f in e)d.indexOf(f)>-1||(a.isPlainObject(this.options[f])?a.extend(this.options[f],e[f]):this.options[f]=e[f]);return this},c.prototype.get=function(a){return this.options[a]},c.prototype.set=function(a,b){this.options[a]=b},c}),c("select2/core",["jquery","./options","./utils","./keys"],function(a,b,c,d){var e=function(a,c){null!=a.data("select2")&&a.data("select2").destroy(),this.$element=a,this.id=this._generateId(a),c=c||{},this.options=new b(c,a),e.__super__.constructor.call(this);var d=this.options.get("dataAdapter");this.data=new d(a,this.options);var f=this.render();this._placeContainer(f);var g=this.options.get("selectionAdapter");this.selection=new g(a,this.options),this.$selection=this.selection.render(),this.selection.position(this.$selection,f);var h=this.options.get("dropdownAdapter");this.dropdown=new h(a,this.options),this.$dropdown=this.dropdown.render(),this.dropdown.position(this.$dropdown,f);var i=this.options.get("resultsAdapter");this.results=new i(a,this.options,this.data),this.$results=this.results.render(),this.results.position(this.$results,this.$dropdown);var j=this;this._bindAdapters(),this._registerDomEvents(),this._registerDataEvents(),this._registerSelectionEvents(),this._registerDropdownEvents(),this._registerResultsEvents(),this._registerEvents(),this.data.current(function(a){j.trigger("selection:update",{data:a})}),a.hide(),this._syncAttributes(),this._tabindex=a.attr("tabindex")||0,a.attr("tabindex","-1"),a.data("select2",this)};return c.Extend(e,c.Observable),e.prototype._generateId=function(a){var b="";return b=null!=a.attr("id")?a.attr("id"):null!=a.attr("name")?a.attr("name")+"-"+c.generateChars(2):c.generateChars(4),b="select2-"+b},e.prototype._placeContainer=function(a){a.insertAfter(this.$element),a.width(this.$element.outerWidth(!1))},e.prototype._bindAdapters=function(){this.data.bind(this,this.$container),this.selection.bind(this,this.$container),this.dropdown.bind(this,this.$container),this.results.bind(this,this.$container)},e.prototype._registerDomEvents=function(){var b=this;this.$element.on("change.select2",function(){b.data.current(function(a){b.trigger("selection:update",{data:a})})}),this._sync=c.bind(this._syncAttributes,this),this.$element[0].attachEvent&&this.$element[0].attachEvent("onpropertychange",this._sync);var d=window.MutationObserver||window.WebKitMutationObserver||window.MozMutationObserver;null!=d&&(this._observer=new d(function(c){a.each(c,b._sync)}),this._observer.observe(this.$element[0],{attributes:!0,subtree:!1}))},e.prototype._registerDataEvents=function(){var a=this;this.data.on("results:message",function(b){a.trigger("results:message",b)})},e.prototype._registerSelectionEvents=function(){var a=this;this.selection.on("open",function(){a.open()}),this.selection.on("close",function(){a.close()}),this.selection.on("toggle",function(){a.toggleDropdown()}),this.selection.on("results:select",function(){a.trigger("results:select")}),this.selection.on("results:previous",function(){a.trigger("results:previous")}),this.selection.on("results:next",function(){a.trigger("results:next")}),this.selection.on("unselected",function(b){a.trigger("unselect",b),a.close()}),this.selection.on("query",function(b){a.trigger("query",b)}),this.selection.on("keypress",function(b){a.trigger("keypress",b)})},e.prototype._registerDropdownEvents=function(){var a=this;this.dropdown.on("query",function(b){a.trigger("query",b)}),this.dropdown.on("keypress",function(b){a.trigger("keypress",b)})},e.prototype._registerResultsEvents=function(){var a=this;this.results.on("query:append",function(b){a.trigger("query:append",b)}),this.results.on("selected",function(b){a.trigger("select",b),a.close()}),this.results.on("unselected",function(b){a.trigger("unselect",b),a.close()}),this.results.on("results:focus",function(b){a.trigger("results:focus",b)})},e.prototype._registerEvents=function(){var a=this;this.on("open",function(){a.$container.addClass("select2-container--open")}),this.on("close",function(){a.$container.removeClass("select2-container--open")}),this.on("enable",function(){a.$container.removeClass("select2-container--disabled")}),this.on("disable",function(){a.$container.addClass("select2-container--disabled")}),this.on("query",function(b){this.data.query(b,function(c){a.trigger("results:all",{data:c,query:b})})}),this.on("query:append",function(b){this.data.query(b,function(c){a.trigger("results:append",{data:c,query:b})})}),this.on("keypress",function(b){var c=b.which;a.isOpen()?c===d.ENTER?(a.trigger("results:select"),b.preventDefault()):c===d.UP?(a.trigger("results:previous"),b.preventDefault()):c===d.DOWN?(a.trigger("results:next"),b.preventDefault()):(c===d.ESC||c===d.TAB)&&(a.close(),b.preventDefault()):(c===d.ENTER||c===d.SPACE||(c===d.DOWN||c===d.UP)&&b.altKey)&&(a.open(),b.preventDefault())})},e.prototype._syncAttributes=function(){this.options.set("disabled",this.$element.prop("disabled")),this.options.get("disabled")?(this.isOpen()&&this.trigger("close"),this.trigger("disable")):this.trigger("enable")},e.prototype.toggleDropdown=function(){this.options.get("disabled")||(this.isOpen()?this.close():this.open())},e.prototype.open=function(){this.isOpen()||(this.trigger("query",{}),this.trigger("open"))},e.prototype.close=function(){this.isOpen()&&this.trigger("close")},e.prototype.isOpen=function(){return this.$container.hasClass("select2-container--open")},e.prototype.enable=function(a){console&&console.warn&&console.warn('Select2: The `select2("val")` method has been deprecated and will be removed in later Select2 versions. Use $element.prop("disabled") instead.'),0===a.length&&(a=[!0]);var b=!a[0];this.$element.prop("disabled",b)},e.prototype.val=function(b){if(console&&console.warn&&console.warn('Select2: The `select2("val")` method has been deprecated and will be removed in later Select2 versions. Use $element.val() instead.'),0===b.length)return this.$element.val();var c=b[0];a.isArray(c)&&(c=a.map(c,function(a){return a.toString()})),this.$element.val(c).trigger("change")},e.prototype.destroy=function(){this.$container.remove(),this.$element[0].detachEvent&&this.$element[0].detachEvent("onpropertychange",this._sync),null!=this._observer&&(this._observer.disconnect(),this._observer=null),this._sync=null,this.$element.off(".select2"),this.$element.attr("tabindex",this._tabindex),this.$element.show(),this.$element.removeData("select2"),this.data.destroy(),this.selection.destroy(),this.dropdown.destroy(),this.results.destroy(),this.data=null,this.selection=null,this.dropdown=null,this.results=null},e.prototype.render=function(){var b=a('<span class="select2 select2-container"><span class="selection"></span><span class="dropdown-wrapper" aria-hidden="true"></span></span>');return b.attr("dir",this.options.get("dir")),this.$container=b,this.$container.addClass("select2-container--"+this.options.get("theme")),b.data("element",this.$element),b},e}),c("jquery.select2",["jquery","select2/core"],function(a,c){try{b("jquery.mousewheel")}catch(d){}return null==a.fn.select2&&(a.fn.select2=function(b){if(b=b||{},"object"==typeof b)return this.each(function(){{var d=a.extend({},b,!0);new c(a(this),d)}}),this;if("string"==typeof b){var d=this.data("select2"),e=Array.prototype.slice.call(arguments,1);return d[b](e)}throw new Error("Invalid arguments for Select2: "+b)}),c}),b("jquery.select2"),$.fn.select2.amd={define:c,require:b}}();
\ No newline at end of file
diff --git a/src/js/jquery.select2.js b/src/js/jquery.select2.js
index de73683b..ab85d51f 100644
--- a/src/js/jquery.select2.js
+++ b/src/js/jquery.select2.js
@@ -2,6 +2,11 @@ define([
   'jquery',
   'select2/core'
 ], function ($, Select2) {
+  // Force jQuery.mousewheel to be loaded if it hasn't already
+  try {
+    require('jquery.mousewheel');
+  } catch (Exception) { }
+
   if ($.fn.select2 == null) {
     $.fn.select2 = function (options) {
       options = options || {};
diff --git a/src/js/select2/results.js b/src/js/select2/results.js
index 48eeee99..993437ff 100644
--- a/src/js/select2/results.js
+++ b/src/js/select2/results.js
@@ -1,6 +1,7 @@
 define([
+  'jquery',
   './utils'
-], function (Utils) {
+], function ($, Utils) {
   function Results ($element, options, dataAdapter) {
     this.$element = $element;
     this.data = dataAdapter;
@@ -366,6 +367,35 @@ define([
       self.displayMessage(params);
     });
 
+    if ($.fn.mousewheel) {
+      this.$results.on('mousewheel', function (e) {
+        var top = self.$results.scrollTop();
+
+        var bottom = (
+          self.$results.get(0).scrollHeight -
+          self.$results.scrollTop() +
+          e.deltaY
+        );
+
+        var isAtTop = e.deltaY > 0 && top - e.deltaY <= 0;
+        var isAtBottom = e.deltaY < 0 && bottom <= self.$results.height();
+
+        if (isAtTop) {
+          self.$results.scrollTop(0);
+
+          e.preventDefault();
+          e.stopPropagation();
+        } else if (isAtBottom) {
+          self.$results.scrollTop(
+            self.$results.get(0).scrollHeight - self.$results.height()
+          );
+
+          e.preventDefault();
+          e.stopPropagation();
+        }
+      });
+    }
+
     this.$results.on('mouseup', '.select2-results__option[aria-selected]',
       function (evt) {
       var $this = $(this);
diff --git a/vendor/jquery.mousewheel.js b/vendor/jquery.mousewheel.js
new file mode 100644
index 00000000..bf61ad0e
--- /dev/null
+++ b/vendor/jquery.mousewheel.js
@@ -0,0 +1,221 @@
+/*!
+ * jQuery Mousewheel 3.1.12
+ *
+ * Copyright 2014 jQuery Foundation and other contributors
+ * Released under the MIT license.
+ * http://jquery.org/license
+ */
+
+(function (factory) {
+    if ( typeof define === 'function' && define.amd ) {
+        // AMD. Register as an anonymous module.
+        define(['jquery'], factory);
+    } else if (typeof exports === 'object') {
+        // Node/CommonJS style for Browserify
+        module.exports = factory;
+    } else {
+        // Browser globals
+        factory(jQuery);
+    }
+}(function ($) {
+
+    var toFix  = ['wheel', 'mousewheel', 'DOMMouseScroll', 'MozMousePixelScroll'],
+        toBind = ( 'onwheel' in document || document.documentMode >= 9 ) ?
+                    ['wheel'] : ['mousewheel', 'DomMouseScroll', 'MozMousePixelScroll'],
+        slice  = Array.prototype.slice,
+        nullLowestDeltaTimeout, lowestDelta;
+
+    if ( $.event.fixHooks ) {
+        for ( var i = toFix.length; i; ) {
+            $.event.fixHooks[ toFix[--i] ] = $.event.mouseHooks;
+        }
+    }
+
+    var special = $.event.special.mousewheel = {
+        version: '3.1.12',
+
+        setup: function() {
+            if ( this.addEventListener ) {
+                for ( var i = toBind.length; i; ) {
+                    this.addEventListener( toBind[--i], handler, false );
+                }
+            } else {
+                this.onmousewheel = handler;
+            }
+            // Store the line height and page height for this particular element
+            $.data(this, 'mousewheel-line-height', special.getLineHeight(this));
+            $.data(this, 'mousewheel-page-height', special.getPageHeight(this));
+        },
+
+        teardown: function() {
+            if ( this.removeEventListener ) {
+                for ( var i = toBind.length; i; ) {
+                    this.removeEventListener( toBind[--i], handler, false );
+                }
+            } else {
+                this.onmousewheel = null;
+            }
+            // Clean up the data we added to the element
+            $.removeData(this, 'mousewheel-line-height');
+            $.removeData(this, 'mousewheel-page-height');
+        },
+
+        getLineHeight: function(elem) {
+            var $elem = $(elem),
+                $parent = $elem['offsetParent' in $.fn ? 'offsetParent' : 'parent']();
+            if (!$parent.length) {
+                $parent = $('body');
+            }
+            return parseInt($parent.css('fontSize'), 10) || parseInt($elem.css('fontSize'), 10) || 16;
+        },
+
+        getPageHeight: function(elem) {
+            return $(elem).height();
+        },
+
+        settings: {
+            adjustOldDeltas: true, // see shouldAdjustOldDeltas() below
+            normalizeOffset: true  // calls getBoundingClientRect for each event
+        }
+    };
+
+    $.fn.extend({
+        mousewheel: function(fn) {
+            return fn ? this.bind('mousewheel', fn) : this.trigger('mousewheel');
+        },
+
+        unmousewheel: function(fn) {
+            return this.unbind('mousewheel', fn);
+        }
+    });
+
+
+    function handler(event) {
+        var orgEvent   = event || window.event,
+            args       = slice.call(arguments, 1),
+            delta      = 0,
+            deltaX     = 0,
+            deltaY     = 0,
+            absDelta   = 0,
+            offsetX    = 0,
+            offsetY    = 0;
+        event = $.event.fix(orgEvent);
+        event.type = 'mousewheel';
+
+        // Old school scrollwheel delta
+        if ( 'detail'      in orgEvent ) { deltaY = orgEvent.detail * -1;      }
+        if ( 'wheelDelta'  in orgEvent ) { deltaY = orgEvent.wheelDelta;       }
+        if ( 'wheelDeltaY' in orgEvent ) { deltaY = orgEvent.wheelDeltaY;      }
+        if ( 'wheelDeltaX' in orgEvent ) { deltaX = orgEvent.wheelDeltaX * -1; }
+
+        // Firefox < 17 horizontal scrolling related to DOMMouseScroll event
+        if ( 'axis' in orgEvent && orgEvent.axis === orgEvent.HORIZONTAL_AXIS ) {
+            deltaX = deltaY * -1;
+            deltaY = 0;
+        }
+
+        // Set delta to be deltaY or deltaX if deltaY is 0 for backwards compatabilitiy
+        delta = deltaY === 0 ? deltaX : deltaY;
+
+        // New school wheel delta (wheel event)
+        if ( 'deltaY' in orgEvent ) {
+            deltaY = orgEvent.deltaY * -1;
+            delta  = deltaY;
+        }
+        if ( 'deltaX' in orgEvent ) {
+            deltaX = orgEvent.deltaX;
+            if ( deltaY === 0 ) { delta  = deltaX * -1; }
+        }
+
+        // No change actually happened, no reason to go any further
+        if ( deltaY === 0 && deltaX === 0 ) { return; }
+
+        // Need to convert lines and pages to pixels if we aren't already in pixels
+        // There are three delta modes:
+        //   * deltaMode 0 is by pixels, nothing to do
+        //   * deltaMode 1 is by lines
+        //   * deltaMode 2 is by pages
+        if ( orgEvent.deltaMode === 1 ) {
+            var lineHeight = $.data(this, 'mousewheel-line-height');
+            delta  *= lineHeight;
+            deltaY *= lineHeight;
+            deltaX *= lineHeight;
+        } else if ( orgEvent.deltaMode === 2 ) {
+            var pageHeight = $.data(this, 'mousewheel-page-height');
+            delta  *= pageHeight;
+            deltaY *= pageHeight;
+            deltaX *= pageHeight;
+        }
+
+        // Store lowest absolute delta to normalize the delta values
+        absDelta = Math.max( Math.abs(deltaY), Math.abs(deltaX) );
+
+        if ( !lowestDelta || absDelta < lowestDelta ) {
+            lowestDelta = absDelta;
+
+            // Adjust older deltas if necessary
+            if ( shouldAdjustOldDeltas(orgEvent, absDelta) ) {
+                lowestDelta /= 40;
+            }
+        }
+
+        // Adjust older deltas if necessary
+        if ( shouldAdjustOldDeltas(orgEvent, absDelta) ) {
+            // Divide all the things by 40!
+            delta  /= 40;
+            deltaX /= 40;
+            deltaY /= 40;
+        }
+
+        // Get a whole, normalized value for the deltas
+        delta  = Math[ delta  >= 1 ? 'floor' : 'ceil' ](delta  / lowestDelta);
+        deltaX = Math[ deltaX >= 1 ? 'floor' : 'ceil' ](deltaX / lowestDelta);
+        deltaY = Math[ deltaY >= 1 ? 'floor' : 'ceil' ](deltaY / lowestDelta);
+
+        // Normalise offsetX and offsetY properties
+        if ( special.settings.normalizeOffset && this.getBoundingClientRect ) {
+            var boundingRect = this.getBoundingClientRect();
+            offsetX = event.clientX - boundingRect.left;
+            offsetY = event.clientY - boundingRect.top;
+        }
+
+        // Add information to the event object
+        event.deltaX = deltaX;
+        event.deltaY = deltaY;
+        event.deltaFactor = lowestDelta;
+        event.offsetX = offsetX;
+        event.offsetY = offsetY;
+        // Go ahead and set deltaMode to 0 since we converted to pixels
+        // Although this is a little odd since we overwrite the deltaX/Y
+        // properties with normalized deltas.
+        event.deltaMode = 0;
+
+        // Add event and delta to the front of the arguments
+        args.unshift(event, delta, deltaX, deltaY);
+
+        // Clearout lowestDelta after sometime to better
+        // handle multiple device types that give different
+        // a different lowestDelta
+        // Ex: trackpad = 3 and mouse wheel = 120
+        if (nullLowestDeltaTimeout) { clearTimeout(nullLowestDeltaTimeout); }
+        nullLowestDeltaTimeout = setTimeout(nullLowestDelta, 200);
+
+        return ($.event.dispatch || $.event.handle).apply(this, args);
+    }
+
+    function nullLowestDelta() {
+        lowestDelta = null;
+    }
+
+    function shouldAdjustOldDeltas(orgEvent, absDelta) {
+        // If this is an older event and the delta is divisable by 120,
+        // then we are assuming that the browser is treating this as an
+        // older mouse wheel event and that we should divide the deltas
+        // by 40 to try and get a more usable deltaFactor.
+        // Side note, this actually impacts the reported scroll distance
+        // in older browsers and can cause scrolling to be slower than native.
+        // Turn this off by setting $.event.special.mousewheel.settings.adjustOldDeltas to false.
+        return special.settings.adjustOldDeltas && orgEvent.type === 'mousewheel' && absDelta % 120 === 0;
+    }
+
+}));