fix($animate): allow enabled children to animate on disabled parents

Prior to this fix if a parent container disabled animations for
itself then no children could be enabled explicity via
`$animate.enabled`. This patch allows for that to work.

Closes angular#13179
Closes angular#13695

Author: matsko

src/ngAnimate/animateQueue.js

@@ -263,12 +263,7 @@ var $$AnimateQueueProvider = ['$animateProvider', function($animateProvider) {
               bool = !recordExists;
             } else {
               // (element, bool) - Element setter
-              bool = !!bool;
-              if (!bool) {
-                disabledElementsLookup.put(node, true);
-              } else if (recordExists) {
-                disabledElementsLookup.remove(node);
-              }
+              disabledElementsLookup.put(node, !bool);
             }
           }
         }
@@ -580,6 +575,7 @@ var $$AnimateQueueProvider = ['$animateProvider', function($animateProvider) {
       var rootElementDetected = isMatchingElement(element, $rootElement);
       var parentAnimationDetected = false;
       var animateChildren;
+      var elementDisabled = disabledElementsLookup.get(getDomNode(element));
 
       var parentHost = element.data(NG_ANIMATE_PIN_DATA);
       if (parentHost) {
@@ -604,7 +600,16 @@ var $$AnimateQueueProvider = ['$animateProvider', function($animateProvider) {
         // therefore we can't allow any animations to take place
         // but if a parent animation is class-based then that's ok
         if (!parentAnimationDetected) {
-          parentAnimationDetected = details.structural || disabledElementsLookup.get(parentNode);
+          var parentElementDisabled = disabledElementsLookup.get(parentNode);
+
+          // disable animations if the user hasn't explicitly enabled animations on the
+          // current element
+          if (parentElementDisabled === true && elementDisabled !== false) {
+            elementDisabled = true;
+          } else if (parentElementDisabled === false) {
+            elementDisabled = false;
+          }
+          parentAnimationDetected = details.structural;
         }
 
         if (isUndefined(animateChildren) || animateChildren === true) {
@@ -639,7 +644,7 @@ var $$AnimateQueueProvider = ['$animateProvider', function($animateProvider) {
         parentElement = parentElement.parent();
       }
 
-      var allowAnimation = !parentAnimationDetected || animateChildren;
+      var allowAnimation = (!parentAnimationDetected || animateChildren) && elementDisabled !== true;
       return allowAnimation && rootElementDetected && bodyElementDetected;
     }
 

test/ngAnimate/animateSpec.js

@@ -304,6 +304,35 @@ describe("animations", function() {
         $rootScope.$digest();
         expect(capturedAnimation).toBeTruthy();
       }));
+
+      it('should run animations on an element and its children if explicitly enabled, even if animations are disabled on the parent',
+        inject(function($animate, $rootScope) {
+
+        var child = jqLite('<div></div>');
+        element.append(child);
+        parent.append(element);
+
+        $animate.enabled(parent, false);
+
+        $animate.addClass(element, 'red');
+        $rootScope.$digest();
+        expect(capturedAnimation).toBeFalsy();
+
+        $animate.addClass(child, 'red');
+        $rootScope.$digest();
+        expect(capturedAnimation).toBeFalsy();
+
+        $animate.enabled(element, true);
+
+        $animate.addClass(element, 'blue');
+        $rootScope.$digest();
+        expect(capturedAnimation).toBeTruthy();
+        capturedAnimation = null;
+
+        $animate.addClass(child, 'blue');
+        $rootScope.$digest();
+        expect(capturedAnimation).toBeTruthy();
+      }));
     });
 
     it('should strip all comment nodes from the animation and not issue an animation if not real elements are found',