Make sure the fragment isn't used if it's not the same set we're working with. Fixes #6068.

src/manipulation.js

@@ -300,7 +300,7 @@ jQuery.fn.extend({
 	},
 
 	domManip: function( args, table, callback ) {
-		var results, first, value = args[0], scripts = [], fragment;
+		var results, first, value = args[0], scripts = [], fragment, parent;
 
 		// We can't cloneNode fragments that contain checked, in WebKit
 		if ( !jQuery.support.checkClone && arguments.length === 3 && typeof value === "string" && rchecked.test( value ) ) {
@@ -318,9 +318,12 @@ jQuery.fn.extend({
 		}
 
 		if ( this[0] ) {
+			parent = value && value.parentNode;
+
 			// If we're in a fragment, just use that instead of building a new one
-			if ( args[0] && args[0].parentNode && args[0].parentNode.nodeType === 11 ) {
-				results = { fragment: args[0].parentNode };
+			if ( parent && parent.nodeType === 11 && parent.childNodes.length === this.length ) {
+				results = { fragment: parent };
+
 			} else {
 				results = buildFragment( args, this, scripts );
 			}
@@ -429,9 +432,10 @@ jQuery.each({
 	replaceAll: "replaceWith"
 }, function( name, original ) {
 	jQuery.fn[ name ] = function( selector ) {
-		var ret = [], insert = jQuery( selector );
+		var ret = [], insert = jQuery( selector ),
+			parent = this.length === 1 && this[0].parentNode;
 		
-		if ( this.length === 1 && this[0].parentNode && this[0].parentNode.nodeType === 11 && insert.length === 1 ) {
+		if ( parent && parent.nodeType === 11 && parent.childNodes.length === 1 && insert.length === 1 ) {
 			insert[ original ]( this[0] );
 			return this;
 			

test/unit/manipulation.js

@@ -376,7 +376,7 @@ test("append(Function) with incoming value", function() {
 });
 
 test("appendTo(String|Element|Array<Element>|jQuery)", function() {
-	expect(12);
+	expect(13);
 	var defaultText = 'Try them out:'
 	jQuery('<b>buga</b>').appendTo('#first');
 	equals( jQuery("#first").text(), defaultText + 'buga', 'Check if text appending works' );
@@ -424,6 +424,11 @@ test("appendTo(String|Element|Array&lt;Element&gt;|jQuery)", function() {
 	ok( jQuery("#moretests div:last").hasClass("test"), "appendTo element was modified after the insertion" );
 
 	reset();
+
+	div = jQuery("<div/>");
+	jQuery("<span>a</span><b>b</b>").filter("span").appendTo( div );
+
+	equals( div.children().length, 1, "Make sure the right number of children were inserted." );
 });
 
 var testPrepend = function(val) {