Fix a regression where has with multiple contexts was not filtering correctly. Test added.

src/traversing.js

@@ -48,12 +48,12 @@ jQuery.fn.extend({
 	},
 
 	has: function( target ) {
-		var i = 0,
+		var i,
 			targets = jQuery( target, this ),
-			l = targets.length;
+			len = targets.length;
 
 		return this.filter(function() {
-			for ( ; i < l; i++ ) {
+			for ( i = 0; i < len; i++ ) {
 				if ( jQuery.contains( this, targets[i] ) ) {
 					return true;
 				}

test/unit/traversing.js

@@ -376,7 +376,7 @@ test("has(Element)", function() {
 });
 
 test("has(Selector)", function() {
-	expect(4);
+	expect( 5 );
 
 	var obj = jQuery("#qunit-fixture").has("#sndp");
 	deepEqual( obj.get(), q("qunit-fixture"), "Keeps elements that have any element matching the selector as a descendant" );
@@ -385,7 +385,10 @@ test("has(Selector)", function() {
 	deepEqual( detached.has("i").get(), detached.get(), "...Even when detached" );
 
 	var multipleParent = jQuery("#qunit-fixture, #header").has("#sndp");
-	deepEqual( obj.get(), q("qunit-fixture"), "Does not include elements that do not have the element as a descendant" );
+	deepEqual( multipleParent.get(), q("qunit-fixture"), "Does not include elements that do not have the element as a descendant" );
+
+	multipleParent = jQuery("#select1, #select2, #select3").has("#option1a, #option3a");
+	deepEqual( multipleParent.get(), q("select1", "select3"), "Multiple contexts are checks correctly" );
 
 	var multipleHas = jQuery("#qunit-fixture").has("#sndp, #first");
 	deepEqual( multipleHas.get(), q("qunit-fixture"), "Only adds elements once" );