@ehelms, `isTruncating` is probably not the best name. Wourld `onTruncate`  make more sense? I meant for the function to callback when truncation is occurring to the result set.
see below:
```javascript
            //callsback onTruncation when results will be masked out
            //callsback onNoTruncation when results are not being masked out
            this.onTruncate = function (onTruncation, onNoTruncation) {                                              
                histories.$promise.then(function (result) {
                    if (result.length > this.numItemsShownWhenMasking) {
                        onTruncation.call();
                    }else{
                        onNotTruncation.call();
                    }   
                }); 
            }; 
```


idea is to be able to set the showMoreHistoriesLink to true/false depending on whether truncation is occurring
```javascript
//in ManifestHistoryController
$scope.manifestHistory.HistoriesMasker($scope.histories).onTruncate(
    function () { $scope.showHistoryMoreLink = true; }, 
    function () { $scope.showHistoryMoreLink = false;}
);
````