Helper to temporarily unhide assets (for working around bug in PhotoKit where cloud ID of hidden assets cannot be accessed)

TemporarilyUnhiddenAssets.Swift

extension PHPhotoLibrary {
    // RADAR: https://feedbackassistant.apple.com/feedback/13660931
    func withTemporarilyUnhiddenAssets<Success>(_ assets: [PHAsset], _ block: () async throws -> Success) async throws -> Success {
        var collectionPlaceholder: PHObjectPlaceholder?
        try await performChanges {
            let collectionChange = PHAssetCollectionChangeRequest.creationRequestForAssetCollection(withTitle: "Temporarily Unhidden Assets")
            collectionPlaceholder = collectionChange.placeholderForCreatedAssetCollection
            collectionChange.insertAssets(assets as NSArray, at: IndexSet((0...).prefix(assets.count)))
            for asset in assets {
                precondition(asset.isHidden)
                let assetChange = PHAssetChangeRequest(for: asset)
                assetChange.isHidden = false
            }
        }
        let result = await Result { try await block() }
        do {
            let collection = PHAssetCollection.fetchAssetCollections(withLocalIdentifiers: [collectionPlaceholder!.localIdentifier], options: nil).firstObject!
            try await performChanges {
                for asset in assets {
                    let assetChange = PHAssetChangeRequest(for: asset)
                    assetChange.isHidden = true
                }
                PHAssetCollectionChangeRequest.deleteAssetCollections([collection] as NSArray)
            }
        } catch let error {
            print("SERIOUS ERROR! PHOTOS NOT RE-HIDDEN!!", error)
            throw error
        }
        return try result.get()
    }
}

extension Result where Failure == Error {
    init(catching body: () async throws -> Success) async {
        do {
            self = .success(try await body())
        } catch let error {
            self = .failure(error)
        }
    }
}