fix(modal): defer promise resolution until animation starts

- Defer resolution of modalInstance promise until the animation cycle starts

src/modal/modal.js

@@ -324,8 +324,11 @@ angular.module('ui.bootstrap.modal', [])
       $modalStack.close = function (modalInstance, result) {
         var modalWindow = openedWindows.get(modalInstance);
         if (modalWindow && broadcastClosing(modalWindow, result, true)) {
-          modalWindow.value.deferred.resolve(result);
+          // Defer resolution until after modal window is closed - #3787
           removeModalWindow(modalInstance, modalWindow.value.modalOpener);
+          $timeout(function() {
+            modalWindow.value.deferred.resolve(result);
+          });
           return true;
         }
         return !modalWindow;
@@ -334,8 +337,11 @@ angular.module('ui.bootstrap.modal', [])
       $modalStack.dismiss = function (modalInstance, reason) {
         var modalWindow = openedWindows.get(modalInstance);
         if (modalWindow && broadcastClosing(modalWindow, reason, false)) {
-          modalWindow.value.deferred.reject(reason);
+          // Defer rejection until after modal window is dismissed - #3787
           removeModalWindow(modalInstance, modalWindow.value.modalOpener);
+          $timeout(function() {
+            modalWindow.value.deferred.reject(reason);
+          });
           return true;
         }
         return !modalWindow;

src/modal/test/modal.spec.js

@@ -673,6 +673,40 @@ describe('$modal', function () {
         expect($document.find('.modal-backdrop')).not.toHaveClass('fade');
       });
 
+      it('should resolve the promise after the animation starts', function () {
+        var modal = open({
+          template: '<div>Small modal dialog</div>',
+          animation: false
+        });
+
+        expect($document).toHaveModalsOpen(1);
+
+        modal.result.then(function() {
+          expect($document).toHaveModalsOpen(0);
+        }, function() {
+          expect(true).toBe(false);
+        });
+
+        close(modal);
+      });
+
+
+      it('should reject the promise after the animation starts', function () {
+        var modal = open({
+          template: '<div>Small modal dialog</div>',
+          animation: false
+        });
+
+        expect($document).toHaveModalsOpen(1);
+
+        modal.result.then(function() {
+          expect(true).toBe(false);
+        }, function() {
+          expect($document).toHaveModalsOpen(0);
+        });
+
+        dismiss(modal);
+      });
     });
 
   });