From abfa0e1e951b74548f9441a7ba44325d8c4d55b7 Mon Sep 17 00:00:00 2001
From: Alex Dovenmuehle <adovenmuehle@gmail.com>
Date: Fri, 19 Nov 2010 08:54:11 -0500
Subject: [PATCH] Core: Fixed switchClass queueing issues using lazy evaluation
 of element's style. Fixed #6244 - switchClass queues incorrectly.

---
 ui/jquery.effects.core.js | 56 ++++++++++++++++++++++-----------------
 1 file changed, 32 insertions(+), 24 deletions(-)

diff --git a/ui/jquery.effects.core.js b/ui/jquery.effects.core.js
index 111cb6f84..9be704128 100644
--- a/ui/jquery.effects.core.js
+++ b/ui/jquery.effects.core.js
@@ -232,33 +232,41 @@ $.effects.animateClass = function(value, duration, easing, callback) {
 	}
 
 	return this.each(function() {
+		$.queue(this, 'fx', function() {
+			var that = $(this),
+				originalStyleAttr = that.attr('style') || ' ',
+				originalStyle = filterStyles(getElementStyles.call(this)),
+				newStyle,
+				className = that.attr('className');
 
-		var that = $(this),
-			originalStyleAttr = that.attr('style') || ' ',
-			originalStyle = filterStyles(getElementStyles.call(this)),
-			newStyle,
-			className = that.attr('className');
-
-		$.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]); }
+				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); }
+			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);
+				}
+				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);
 		});
 	});
 };
-- 
2.39.5