Fix #12278. Promises on non-default queue wait until a dequeue is attempted on...

Fix #12278. Promises on non-default queue wait until a dequeue is attempted on an empty queue. Close gh-893.

src/queue.js

@@ -22,6 +22,7 @@ jQuery.extend({
 		type = type || "fx";
 
 		var queue = jQuery.queue( elem, type ),
+			startLength = queue.length,
 			fn = queue.shift(),
 			hooks = jQuery._queueHooks( elem, type ),
 			next = function() {
@@ -31,6 +32,7 @@ jQuery.extend({
 		// If the fx queue is dequeued, always remove the progress sentinel
 		if ( fn === "inprogress" ) {
 			fn = queue.shift();
+			startLength--;
 		}
 
 		if ( fn ) {
@@ -45,7 +47,8 @@ jQuery.extend({
 			delete hooks.stop;
 			fn.call( elem, next, hooks );
 		}
-		if ( !queue.length && hooks ) {
+
+		if ( !startLength && hooks ) {
 			hooks.empty.fire();
 		}
 	},
@@ -131,7 +134,8 @@ jQuery.fn.extend({
 		type = type || "fx";
 
 		while( i-- ) {
-			if ( (tmp = jQuery._data( elements[ i ], type + "queueHooks" )) && tmp.empty ) {
+			tmp = jQuery._data( elements[ i ], type + "queueHooks" );
+			if ( tmp && tmp.empty ) {
 				count++;
 				tmp.empty.add( resolve );
 			}

test/unit/queue.js

 module( "queue", { teardown: moduleTeardown });
 
-test( "queue() with other types", 12, function() {
+test( "queue() with other types", 14, function() {
 	var counter = 0;
 
 	stop();
@@ -45,6 +45,12 @@ test( "queue() with other types", 12, function() {
 
 	equal( counter, 4, "Testing previous call to dequeue" );
 	equal( $div.queue("foo").length, 0, "Testing queue length" );
+
+	$div.dequeue("foo");
+
+	equal( counter, 4, "Testing previous call to dequeue" );
+	equal( $div.queue("foo").length, 0, "Testing queue length" );
+
 });
 
 test("queue(name) passes in the next item in the queue as a parameter", function() {
@@ -206,8 +212,8 @@ asyncTest( "fn.promise( \"queue\" ) - called whenever last queue function is deq
 	}).queue( "queue", function( next ) {
 		strictEqual( test++, 2, "step two" );
 		setTimeout( function() {
-			strictEqual( test++, 4, "step four" );
 			next();
+			strictEqual( test++, 4, "step four" );
 			start();
 		}, 10 );
 	}).promise( "queue" ).done( function() {
@@ -217,6 +223,27 @@ asyncTest( "fn.promise( \"queue\" ) - called whenever last queue function is deq
 	foo.dequeue( "queue" );
 });
 
+asyncTest( "fn.promise( \"queue\" ) - waits for animation to complete before resolving", 2, function() {
+	var foo = jQuery( "#foo" ),
+		test = 1;
+
+	foo.animate({
+		top: 100
+	}, {
+		duration: 1,
+		queue: "queue",
+		complete: function() {
+			strictEqual( test++, 1, "step one" );
+		}
+	}).dequeue( "queue" );
+
+	foo.promise( "queue" ).done( function() {
+		strictEqual( test++, 2, "step two" );
+		start();
+	});
+
+});
+
 test( ".promise(obj)", function() {
 	expect(2);