How best to implement Peek and Pop in ChatViewController?

Hello! How best to implement Peek and Pop in ChatViewController, I need to do this for only one particular cell, and I did the first code sketch, but this only works for the top two cels. Tell me how this is best implemented.

```
func previewingContext(_ previewingContext: UIViewControllerPreviewing, viewControllerForLocation location: CGPoint) -> UIViewController? {
guard let indexPath = collectionView?.indexPathForItem(at: location) else { return nil }
guard let cell = collectionView?.cellForItem(at: indexPath) as? ExampleMessageCollectionViewCell else { return nil }

let detailVC = UIViewController()
detailVC.view.backgroundColor = .red
previewingContext.sourceRect = cell.frame

return detailVC
}
```

Start in ChatViewController at previewingContext(_:viewControllerForLocation:) and inspect how collectionView resolves an index path and cell. Compare the behavior across cells, especially ExampleMessageCollectionViewCell, and determine the intended Peek and Pop scope for one cell; done means the requested cell previews and pops correctly without limiting behavior to the top two cells.

Written by the indexing model from the issue text.