Enforce that hasClass and removeClass work even with tabs and endlines in...

Enforce that hasClass and removeClass work even with tabs and endlines in class attributes. Fixes #5505.

src/attributes.js

+var rclass = /[\n\t]/g;
+
 jQuery.fn.extend({
 	attr: function( name, value ) {
 		return access(this, name, value, true, jQuery.attr);
@@ -49,7 +51,7 @@ jQuery.fn.extend({
 
 				if ( elem.nodeType === 1 && elem.className ) {
 					if ( value ) {
-					var className = " " + elem.className + " ";
+						var className = (" " + elem.className + " ").replace(rclass, " ");
 						for ( var c = 0, cl = classNames.length; c < cl; c++ ) {
 							className = className.replace(" " + classNames[c] + " ", " ");
 						}
@@ -67,7 +69,7 @@ jQuery.fn.extend({
 	hasClass: function( selector ) {
 		var className = " " + selector + " ";
 		for ( var i = 0, l = this.length; i < l; i++ ) {
-			if ( (" " + this[i].className + " ").indexOf( className ) > -1 ) {
+			if ( (" " + this[i].className + " ").replace(rclass, " ").indexOf( className ) > -1 ) {
 				return true;
 			}
 		}

test/unit/attributes.js

@@ -427,23 +427,37 @@ test("removeAttr(Function)", function() {
 });
 
 test("addClass, removeClass, hasClass", function() {
-	expect(6);
-
+	expect(14);
+ 
 	var jq = jQuery("<p>Hi</p>"), x = jq[0];
-
+ 
 	jq.addClass("hi");
 	equals( x.className, "hi", "Check single added class" );
-
+ 
 	jq.addClass("foo bar");
 	equals( x.className, "hi foo bar", "Check more added classes" );
-
+ 
 	jq.removeClass();
 	equals( x.className, "", "Remove all classes" );
-
+ 
 	jq.addClass("hi foo bar");
 	jq.removeClass("foo");
 	equals( x.className, "hi bar", "Check removal of one class" );
-
+ 
 	ok( jq.hasClass("hi"), "Check has1" );
 	ok( jq.hasClass("bar"), "Check has2" );
+ 
+	var jq = jQuery("<p class='class1\nclass2\tcla.ss3\n'></p>");
+	ok( jq.hasClass("class1"), "Check hasClass with carriage return" );
+	ok( jq.is(".class1"), "Check is with carriage return" );
+	ok( jq.hasClass("class2"), "Check hasClass with tab" );
+	ok( jq.is(".class2"), "Check is with tab" );
+	ok( jq.hasClass("cla.ss3"), "Check hasClass with dot" );
+ 
+	jq.removeClass("class2");
+	ok( jq.hasClass("class2")==false, "Check the class has been properly removed" );
+	jq.removeClass("cla");
+	ok( jq.hasClass("cla.ss3"), "Check the dotted class has not been removed" );
+	jq.removeClass("cla.ss3");
+	ok( jq.hasClass("cla.ss3")==false, "Check the dotted class has been removed" );
 });