/// <summary>
/// Determine if the collection is "really" dirty, by checking dirtiness
/// of the collection elements, if necessary
/// </summary>
private async Task DirtyAsync(IPersistentCollection collection, CancellationToken cancellationToken)
{
cancellationToken.ThrowIfCancellationRequested();
// if the collection is initialized and it was previously persistent
// initialize the dirty flag
bool forceDirty = collection.WasInitialized && !collection.IsDirty && LoadedPersister != null &&
LoadedPersister.IsMutable &&
(collection.IsDirectlyAccessible || LoadedPersister.ElementType.IsMutable) &&
!await(collection.EqualsSnapshotAsync(LoadedPersister, cancellationToken)).ConfigureAwait(false);
if (forceDirty)
{
collection.Dirty();
}
}