Widget: Enable namespace functions for widgets.

Example:
  $(".tab").custom().tab(); will use the widget defined by
  $.widget("custom.tab", {});

Author: cschneid

tests/unit/widget/widget_core.js

@@ -40,6 +40,18 @@ test( "widget namespaces", function() {
   $.custom.testWidget.prototype._create = function(){ which = "custom"; };
   var elem3 = $( "<div></div>" ).custom_testWidget();
   equals( which, "custom", "creating a namespaced widget makes the correct one" );
+
+  // Now make sure we can explicitly pick the one we want via the chained version of namespace.
+  var which = "neither";
+  $.ui.testWidget.prototype._create = function(){ which = "ui"; };
+  var elem2 = $( "<div></div>" ).ui().testWidget();
+  equals( which, "ui" , "creating a namespaced widget with the namespace function makes the correct one" );
+
+  which = "neither";
+  $.custom.testWidget.prototype._create = function(){ which = "custom"; };
+  var elem3 = $( "<div></div>" ).custom().testWidget();
+  equals( which, "custom", "creating a namespaced widget with the namespace function makes the correct one" );
+
 });
 
 test( "widget creation", function() {

ui/jquery.ui.widget.js

@@ -127,6 +127,18 @@ $.widget.bridge = function( name, namespace, object ) {
 		return returnValue;
 	};
 
+    // Check to see if we aren't the first widget to come this way.
+    if ( $.isFunction( $.fn[ namespace ] ) ) {
+      $.fn[ namespace ][ name ] = bridgeFn; 
+    } else {
+      // Store off the jquery instance so we can get at it in the namespaceFn
+      var jquery_obj = this;
+      var namespaceFn = function() {
+        this[ name ] = bridgeFn;
+        return this;
+      }
+      $.fn[ namespace ] = namespaceFn;
+    }
 
     // Attach the bridge function to both the raw name - example: `$.sortable()`
     // And also attach it to a namespaced name         - example: `$.ui_sortable()`