fix($animate): ensure that animations are not disabled after $rootElement is animated

src/ngAnimate/animate.js

@@ -535,7 +535,9 @@ angular.module('ngAnimate', ['ng'])
         function done() {
           if(!done.hasBeenRun) {
             done.hasBeenRun = true;
-            element.removeData(NG_ANIMATE_STATE);
+            if(element != $rootElement) {
+              element.removeData(NG_ANIMATE_STATE);
+            }
             (onComplete || noop)();
           }
         }

test/ngAnimate/animateSpec.js

@@ -1515,4 +1515,21 @@ describe("ngAnimate", function() {
     });
   });
 
+  it("should not remove the animation flag data on $rootElement after an animation is executed", 
+    inject(function($compile, $rootElement, $animate, $document) {
+
+    var stateFlag = '$$ngAnimateState';
+    var body = jqLite($document[0].body);
+
+    //this is here since $rootElement is not on the document node
+    body.data(stateFlag, {});
+    body.append($rootElement);
+
+    expect(isObject($rootElement.data(stateFlag))).toBe(true);
+
+    $animate.addClass($rootElement, 'parent');
+
+    expect(isObject($rootElement.data(stateFlag))).toBe(true);
+  }));
+
 });