title: ng-repeat in angularjs when $scope change
body: <p>First, I get data from server and set to <code>$scope.data</code> and use it to show in table by ng-repeat. Then I continue get data from server then concat with old <code>$scope.data</code> (<code>$scope.data=$scope.data.concat(newdata)</code>) => Broswer will draw some new rows of new data.</p>
  
  <p>But I don not know the old data (ex <code>$scope.data[0]</code>, not change value) will be re-draw or not? Can you let me know.</p>