Class Animation: Use .attr( "class" ) instead of .attr( "className" )…

… and adjust the queueing logic for jQuery 1.6 compatibility. Fixes #7275 - $.effects.animateClass broken in jQuery 1.6.

ui/jquery.effects.core.js

@@ -231,41 +231,40 @@ $.effects.animateClass = function(value, duration, easing, callback) {
 		easing = null;
 	}
 
-	return this.queue('fx', function() {
+	return this.queue(function() {
 		var that = $(this),
 			originalStyleAttr = that.attr('style') || ' ',
 			originalStyle = filterStyles(getElementStyles.call(this)),
 			newStyle,
-			className = that.attr('className');
+			className = that.attr('class');
 
 		$.each(classAnimationActions, function(i, action) {
 			if (value[action]) {
 				that[action + 'Class'](value[action]);
 			}
 		});
 		newStyle = filterStyles(getElementStyles.call(this));
-		that.attr('className', className);
-
-		that.animate(styleDifference(originalStyle, newStyle), duration, easing, function() {
-			$.each(classAnimationActions, function(i, action) {
-				if (value[action]) { that[action + 'Class'](value[action]); }
-			});
-			// work around bug in IE by clearing the cssText before setting it
-			if (typeof that.attr('style') == 'object') {
-				that.attr('style').cssText = '';
-				that.attr('style').cssText = originalStyleAttr;
-			} else {
-				that.attr('style', originalStyleAttr);
+		that.attr('class', className);
+
+		that.animate(styleDifference(originalStyle, newStyle), {
+			queue: false,
+			duration: duration,
+			easding: easing,
+			complete: function() {
+				$.each(classAnimationActions, function(i, action) {
+					if (value[action]) { that[action + 'Class'](value[action]); }
+				});
+				// work around bug in IE by clearing the cssText before setting it
+				if (typeof that.attr('style') == 'object') {
+					that.attr('style').cssText = '';
+					that.attr('style').cssText = originalStyleAttr;
+				} else {
+					that.attr('style', originalStyleAttr);
+				}
+				if (callback) { callback.apply(this, arguments); }
+				$.dequeue( this );
 			}
-			if (callback) { callback.apply(this, arguments); }
 		});
-
-		// $.animate adds a function to the end of the queue
-		// but we want it at the front
-		var queue = $.queue(this),
-			anim = queue.splice(queue.length - 1, 1)[0];
-		queue.splice(1, 0, anim);
-		$.dequeue(this);
 	});
 };