How to use moveItem in NSCollectionView in AppKit

Issue #332

From moveItem(at:to:)

Moves an item from one location to another in the collection view.

After rearranging items in your data source object, use this method to synchronize those changes with the collection view. Calling this method lets the collection view know that it must update its internal data structures and possibly update its visual appearance. You can move the item to a different section or to a new location in the same section. The collection view updates the layout as needed to account for the move, animating cells into position in response.

When inserting or deleting multiple sections and items, you can animate all of your changes at once using the performBatchUpdates(_:completionHandler:) method.

notes.swapAt(index, 0)

collectionView.animator().moveItem(
    at: index.toIndexPath(),
    to: 0.toIndexPath()
)

There may be unknown reasons or bug that make other cells stay in incorrect state. The fix is to reload the rest cells

let set = Set((1..<notes.count).map({ $0.toIndexPath() }))
collectionView.reloadItems(at: set)