Implemented support for .context limited .closest() calls. Fixes #4072.

src/traversing.js

@@ -53,11 +53,12 @@ jQuery.fn.extend({
 
 	closest: function( selector ) {
 		var pos = jQuery.expr.match.POS.test( selector ) ? jQuery(selector) : null,
-			closer = 0;
+			closer = 0,
+			context = this.context;
 
 		return this.map(function(){
 			var cur = this;
-			while ( cur && cur.ownerDocument ) {
+			while ( cur && cur.ownerDocument && cur !== context ) {
 				if ( pos ? pos.index(cur) > -1 : jQuery(cur).is(selector) ) {
 					jQuery.data(cur, "closest", closer);
 					return cur;
@@ -120,4 +121,4 @@ jQuery.each({
 
 		return this.pushStack( jQuery.unique( ret ), name, selector );
 	};
-});
+});

test/unit/traversing.js

@@ -91,14 +91,20 @@ test("filter(jQuery)", function() {
 })
 
 test("closest()", function() {
-	expect(6);
+	expect(9);
 	isSet( jQuery("body").closest("body").get(), q("body"), "closest(body)" );
 	isSet( jQuery("body").closest("html").get(), q("html"), "closest(html)" );
 	isSet( jQuery("body").closest("div").get(), [], "closest(div)" );
 	isSet( jQuery("#main").closest("span,#html").get(), q("html"), "closest(span,#html)" );
 
 	isSet( jQuery("div:eq(1)").closest("div:first").get(), [], "closest(div:first)" );
 	isSet( jQuery("div").closest("body:first div:last").get(), q("fx-tests"), "closest(body:first div:last)" );
+
+	// Test .closest() limited by the context
+	var jq = jQuery("#nothiddendivchild", document.body);
+	isSet( jq.closest("html").get(), [], "Context limited." );
+	isSet( jq.closest("body").get(), [], "Context limited." );
+	isSet( jq.closest("#nothiddendiv").get(), q("nothiddendiv"), "Context not reached." );
 });
 
 test("not(Selector)", function() {