fix($animate): clear class animations cache if animation is not started

Closes angular#12604
Closes angular#12603

Author: matsko

src/ngAnimate/animate.js

@@ -1194,8 +1194,11 @@ angular.module('ngAnimate', ['ng'])
           }
 
           return cache.promise = runAnimationPostDigest(function(done) {
-            var parentNode, parentElement, elementNode = extractElementNode(element);
+            var cache, parentNode, parentElement, elementNode = extractElementNode(element);
             if (elementNode) {
+              cache = element.data(STORAGE_KEY);
+              element.removeData(STORAGE_KEY);
+
               parentElement = element.parent();
               parentNode = elementNode.parentNode;
             }
@@ -1206,9 +1209,6 @@ angular.module('ngAnimate', ['ng'])
               return;
             }
 
-            var cache = element.data(STORAGE_KEY);
-            element.removeData(STORAGE_KEY);
-
             var state = element.data(NG_ANIMATE_STATE) || {};
             var classes = resolveElementClasses(element, cache, state.active);
             return !classes

test/ngAnimate/animateSpec.js

@@ -543,6 +543,43 @@ describe("ngAnimate", function() {
           });
         });
 
+        it("should clear the setClass element animation cache before the next animation runs", function() {
+          var animateSpy = jasmine.createSpy();
+          module(function($animateProvider) {
+            $animateProvider.register('.track-me', function() {
+              return {
+                addClass: animateSpy,
+                removeClass: animateSpy,
+                setClass: animateSpy
+              };
+            });
+          });
+          inject(function($animate, $rootScope, $sniffer, $$rAF) {
+            var orphanChild = jqLite('<div class="track-me"></div>');
+            element.append(orphanChild);
+            orphanChild.remove();
+
+            var doneSpy = jasmine.createSpy();
+
+            $animate.setClass(orphanChild, 'red', 'blue').then(doneSpy);
+            $rootScope.$digest();
+            $animate.triggerCallbacks();
+
+            expect(doneSpy).toHaveBeenCalled();
+            expect(animateSpy).not.toHaveBeenCalled();
+
+            var specialChild = jqLite('<div class="track-me"></div>');
+            element.append(specialChild);
+
+            $animate.setClass(specialChild, 'blue', 'gold').then(doneSpy);
+            $rootScope.$digest();
+            $animate.triggerReflow();
+            $animate.triggerCallbacks();
+
+            expect(animateSpy).toHaveBeenCalled();
+          });
+        });
+
         it("should exclusively animate the setClass animation event with native dom elements", function() {
           var count = 0, fallback = jasmine.createSpy('callback');
           module(function($animateProvider) {