Widget: Don't modify the prototype passed to $.widget(). Fixes #8876 …

…- Calling _super calls wrong inherited widget.

tests/unit/widget/widget_core.js

@@ -13,18 +13,23 @@ TestHelpers.testJshint( "widget" );
 
 test( "widget creation", function() {
 	expect( 5 );
-	var myPrototype = {
-		_create: function() {},
-		creationTest: function() {}
-	};
+	var method,
+		myPrototype = {
+			_create: function() {
+				equal( method, "_create", "create function is copied over" );
+			},
+			creationTest: function() {
+				equal( method, "creationTest", "random function is copied over" );
+			}
+		};
 
 	$.widget( "ui.testWidget", myPrototype );
 	ok( $.isFunction( $.ui.testWidget ), "constructor was created" );
 	equal( typeof $.ui.testWidget.prototype, "object", "prototype was created" );
-	equal( $.ui.testWidget.prototype._create, myPrototype._create,
-		"create function is copied over" );
-	equal( $.ui.testWidget.prototype.creationTest, myPrototype.creationTest,
-		"random function is copied over" );
+	method = "_create";
+	$.ui.testWidget.prototype._create();
+	method = "creationTest";
+	$.ui.testWidget.prototype.creationTest();
 	equal( $.ui.testWidget.prototype.option, $.Widget.prototype.option,
 		"option method copied over from base widget" );
 });
@@ -1324,6 +1329,34 @@ test( "redefine - widgetEventPrefix", function() {
 
 });
 
+test( "mixins", function() {
+	expect( 2 );
+
+	var mixin = {
+		method: function() {
+			return "mixed " + this._super();
+		}
+	};
+
+	$.widget( "ui.testWidget1", {
+		method: function() {
+			return "testWidget1";
+		}
+	});
+	$.widget( "ui.testWidget2", {
+		method: function() {
+			return "testWidget2";
+		}
+	});
+	$.widget( "ui.testWidget1", $.ui.testWidget1, mixin );
+	$.widget( "ui.testWidget2", $.ui.testWidget2, mixin );
+
+	equal( $( "<div>" ).testWidget1().testWidget1( "method" ),
+		"mixed testWidget1", "testWidget1 mixin successful" );
+	equal( $( "<div>" ).testWidget2().testWidget2( "method" ),
+		"mixed testWidget2", "testWidget2 mixin successful" );
+});
+
 asyncTest( "_delay", function() {
 	expect( 6 );
 	var order = 0,

ui/jquery.ui.widget.js

@@ -25,6 +25,9 @@ $.cleanData = function( elems ) {
 
 $.widget = function( name, base, prototype ) {
 	var fullName, existingConstructor, constructor, basePrototype,
+		// proxiedPrototype allows the provided prototype to remain unmodified
+		// so that it can be used as a mixin for multiple widgets (#8876)
+		proxiedPrototype = {},
 		namespace = name.split( "." )[ 0 ];
 
 	name = name.split( "." )[ 1 ];
@@ -71,38 +74,40 @@ $.widget = function( name, base, prototype ) {
 	// inheriting from
 	basePrototype.options = $.widget.extend( {}, basePrototype.options );
 	$.each( prototype, function( prop, value ) {
-		if ( $.isFunction( value ) ) {
-			prototype[ prop ] = (function() {
-				var _super = function() {
-						return base.prototype[ prop ].apply( this, arguments );
-					},
-					_superApply = function( args ) {
-						return base.prototype[ prop ].apply( this, args );
-					};
-				return function() {
-					var __super = this._super,
-						__superApply = this._superApply,
-						returnValue;
-
-					this._super = _super;
-					this._superApply = _superApply;
-
-					returnValue = value.apply( this, arguments );
-
-					this._super = __super;
-					this._superApply = __superApply;
-
-					return returnValue;
-				};
-			})();
+		if ( !$.isFunction( value ) ) {
+			proxiedPrototype[ prop ] = value;
+			return;
 		}
+		proxiedPrototype[ prop ] = (function() {
+			var _super = function() {
+					return base.prototype[ prop ].apply( this, arguments );
+				},
+				_superApply = function( args ) {
+					return base.prototype[ prop ].apply( this, args );
+				};
+			return function() {
+				var __super = this._super,
+					__superApply = this._superApply,
+					returnValue;
+
+				this._super = _super;
+				this._superApply = _superApply;
+
+				returnValue = value.apply( this, arguments );
+
+				this._super = __super;
+				this._superApply = __superApply;
+
+				return returnValue;
+			};
+		})();
 	});
 	constructor.prototype = $.widget.extend( basePrototype, {
 		// TODO: remove support for widgetEventPrefix
 		// always use the name + a colon as the prefix, e.g., draggable:start
 		// don't prefix for widgets that aren't DOM-based
 		widgetEventPrefix: existingConstructor ? basePrototype.widgetEventPrefix : name
-	}, prototype, {
+	}, proxiedPrototype, {
 		constructor: constructor,
 		namespace: namespace,
 		widgetName: name,