AngularJS 1.8: Strange behavior with ng-repeat and track by when filtering a large dataset
I'm performance testing and I'm experiencing a peculiar scenario in my AngularJS 1.8 application where I'm using `ng-repeat` to iterate over a large dataset, and I'm also applying a filter... I've added the `track by` clause to optimize rendering performance, but it seems to be causing unexpected behavior. When I filter the list based on user input, the UI doesn't update as expected. For instance, if I have a list of items and I apply a filter that should narrow down the list, the filtered items still maintain the same state as the original list, which leads to incorrect data being displayed. Here’s a simplified version of my code: ```html <input type="text" ng-model="searchText" placeholder="Search items..."> <ul> <li ng-repeat="item in items | filter:searchText track by item.id"> {{ item.name }} </li> </ul> ``` I’ve verified that `item.id` is unique for each item in the `items` array. However, when I type in the search input, the UI only seems to refresh for some of the items, and others retain their previous state. I also checked that the `items` array is being updated correctly in the controller, but the view doesn’t reflect those changes properly. I've tried removing the `track by` clause, and that does make the filter work as expected, but I really want to maintain the performance improvements from using `track by`. Is there a specific way I need to structure my data or use `track by` in conjunction with filters in `ng-repeat`? Any insights would be greatly appreciated! Is there a better approach? What am I doing wrong?