static EditOperation TransformForTargetState(EditOperation transformee, IEnumerable<int> sortedTargetState, Dictionary<int, EditOperation> transformedOperations, ICollection<EditOperation> allOperations)
{
EditOperation result;
if (!transformedOperations.TryGetValue(transformee.Id, out result))
{
SpringboardState springBoardState = transformee.ChangeSubset.SpringboardState;
List<int> sortedSpringBoard = new List<int>(springBoardState.Entries.Select(x => x.EditOperationId));
sortedSpringBoard.Sort();
List<UndoRedoEntry> undosRedos = new List<UndoRedoEntry>();
ComputeStateDifferences(transformee.Id, sortedSpringBoard, sortedTargetState, undosRedos);
result = transformee;
foreach (UndoRedoEntry undoRedoEntry in undosRedos)
{
int transformerId = undoRedoEntry.OperationId;
EditOperation transformer = TransformForTargetState(allOperations.First(x => (x.Id == transformerId)), sortedTargetState, transformedOperations, allOperations);
if (undoRedoEntry.IsRedo)
result = result.RedoPrior(transformer);
else
result = result.UndoPrior(transformer);
}
transformedOperations[transformee.Id] = result;
}
return result;
}