Backing out cec68e2b, was causing serialize...

Backing out cec68e2b, was causing serialize tests to fail. Un-fixes #5566.

src/manipulation.js

@@ -352,7 +352,7 @@ jQuery.fn.extend({
 							root(this[i], first) :
 							this[i],
 						i > 0 || results.cacheable || this.length > 1  ?
-							jQuery(fragment).clone(true)[0] :
+							fragment.cloneNode(true) :
 							fragment
 					);
 				}

test/unit/manipulation.js

@@ -381,26 +381,6 @@ test("append(Function) with incoming value", function() {
 	QUnit.reset();
 });
 
-test("append the same fragment with events (Bug #6997, 5566)", function () {
-	expect(2);
-	stop(1000);
-
-	var element = jQuery("<a class='test6997'></a>").click(function () {
-		ok(true, "Append second element events work");
-	});
-
-	jQuery("#listWithTabIndex li").append(element)
-		.find('a.test6997').eq(1).click();
-
-	element = jQuery("<li class='test6997'></li>").click(function () {
-		ok(true, "Before second element events work");
-		start();
-	});
-
-	jQuery("#listWithTabIndex li").before(element);
-	jQuery("#listWithTabIndex li.test6997").eq(1).click();
-});
-
 test("appendTo(String|Element|Array&lt;Element&gt;|jQuery)", function() {
 	expect(16);