fix(chips): makes sure that input is cleared when selecting a chip

Closes #3575

src/components/autocomplete/js/autocompleteController.js

@@ -135,8 +135,7 @@ function MdAutocompleteCtrl ($scope, $element, $mdUtil, $mdConstant, $mdTheming,
     $attrs.$observe('disabled', function (value) { ctrl.isDisabled = value; });
     $attrs.$observe('required', function (value) { ctrl.isRequired = value !== null; });
     $scope.$watch('searchText', wait ? $mdUtil.debounce(handleSearchText, wait) : handleSearchText);
-    registerSelectedItemWatcher(selectedItemChange);
-    $scope.$watch('selectedItem', handleSelectedItemChange);
+    $scope.$watch('selectedItem', selectedItemChange);
     angular.element($window).on('resize', positionDropdown);
     $scope.$on('$destroy', cleanup);
   }
@@ -236,6 +235,7 @@ function MdAutocompleteCtrl ($scope, $element, $mdUtil, $mdConstant, $mdTheming,
     if (selectedItem) {
       getDisplayValue(selectedItem).then(function(val) {
         $scope.searchText = val;
+        handleSelectedItemChange(selectedItem, previousSelectedItem);
       });
     }
 
@@ -249,6 +249,9 @@ function MdAutocompleteCtrl ($scope, $element, $mdUtil, $mdConstant, $mdTheming,
     angular.isFunction($scope.itemChange) && $scope.itemChange(getItemAsNameVal($scope.selectedItem));
   }
 
+  /**
+   * Use the user-defined expression to announce changes each time the search text is changed
+   */
   function announceTextChange() {
     angular.isFunction($scope.textChange) && $scope.textChange();
   }
@@ -260,9 +263,7 @@ function MdAutocompleteCtrl ($scope, $element, $mdUtil, $mdConstant, $mdTheming,
    * @param previousSelectedItem
    */
   function handleSelectedItemChange(selectedItem, previousSelectedItem) {
-    for (var i = 0; i < selectedItemWatchers.length; ++i) {
-      selectedItemWatchers[i](selectedItem, previousSelectedItem);
-    }
+    selectedItemWatchers.forEach(function (watcher) { watcher(selectedItem, previousSelectedItem); });
   }
 
   /**

src/components/chips/chips.spec.js

@@ -163,6 +163,7 @@ describe('<md-chips>', function() {
 
         expect(scope.items.length).toBe(4);
         expect(scope.items[3]).toBe('Kiwi');
+        expect(element.find('input').val()).toBe('');
       }));
     });