.closest() should return a unique set of elements, not duplicates of the same...

.closest() should return a unique set of elements, not duplicates of the same ancestor.  Fixes #6700

src/traversing.js

@@ -53,9 +53,10 @@ jQuery.fn.extend({
 	},
 
 	closest: function( selectors, context ) {
+		var ret;
 		if ( jQuery.isArray( selectors ) ) {
-			var ret = [], cur = this[0], match, matches = {}, selector, level = 1;
-
+			var cur = this[0], match, matches = {}, selector, level = 1;
+			ret = [];
 			if ( cur && selectors.length ) {
 				for ( var i = 0, l = selectors.length; i < l; i++ ) {
 					selector = selectors[i];
@@ -80,13 +81,12 @@ jQuery.fn.extend({
 				}
 			}
 
-			return ret;
+			return ret.length > 1 ? jQuery.unique(ret) : ret;
 		}
 
 		var pos = jQuery.expr.match.POS.test( selectors ) ? 
 			jQuery( selectors, context || this.context ) : null;
-
-		return this.map(function( i, cur ) {
+		ret = jQuery.map(this.get(),function( cur,i ) {
 			while ( cur && cur.ownerDocument && cur !== context ) {
 				if ( pos ? pos.index(cur) > -1 : jQuery(cur).is(selectors) ) {
 					return cur;
@@ -95,6 +95,10 @@ jQuery.fn.extend({
 			}
 			return null;
 		});
+		
+		ret = ret.length > 1 ? jQuery.unique(ret) : ret;
+		
+		return this.pushStack( ret, "closest", selectors );
 	},
 	
 	// Determine the position of an element within

test/unit/traversing.js

@@ -120,7 +120,7 @@ test("filter(jQuery)", function() {
 })
 
 test("closest()", function() {
-	expect(9);
+	expect(10);
 	same( jQuery("body").closest("body").get(), q("body"), "closest(body)" );
 	same( jQuery("body").closest("html").get(), q("html"), "closest(html)" );
 	same( jQuery("body").closest("div").get(), [], "closest(div)" );
@@ -134,6 +134,10 @@ test("closest()", function() {
 	same( jq.closest("html", document.body).get(), [], "Context limited." );
 	same( jq.closest("body", document.body).get(), [], "Context limited." );
 	same( jq.closest("#nothiddendiv", document.body).get(), q("nothiddendiv"), "Context not reached." );
+	
+	//Test that .closest() returns unique'd set
+	equals( jQuery('#main p').closest('#main').length, 1, "Closest should return a unique set" );
+	
 });
 
 test("closest(Array)", function() {