ng-multiselect-搜索后未显示正确结果的下拉列表

<select ng-model="selectedItems" ng-multiselect multiple>
  <option ng-repeat="item in items" value="{{item.id}}">{{item.name}}</option>
</select>

$scope.items = [
  { id: 1, name: 'Item 1' },
  { id: 2, name: 'Item 2' },
  { id: 3, name: 'Item 3' }
];
$scope.selectedItems = [];

<select ng-model="selectedItems" ng-multiselect multiple search-filter="customSearch">
  <option ng-repeat="item in filteredItems" value="{{item.id}}">{{item.name}}</option>
</select>

$scope.customSearch = function(searchText) {
  return function(item) {
    return item.name.toLowerCase().indexOf(searchText.toLowerCase()) > -1;
  };
};

$scope.$watch('searchText', function(newValue, oldValue) {
  if (newValue !== oldValue) {
    $scope.filteredItems = $filter('filter')($scope.items, $scope.customSearch(newValue));
  }
});

$scope.items = [
  { id: 1, name: 'Item 1' },
  { id: 2, name: 'Item 2' },
  { id: 3, name: 'Item 3' }
];