/// <summary>
/// Registers the specified operation and performs it right after
/// </summary>
public void RegisterThenPerform(IUndoOp op)
{
Register(op);
op.Perform();
}
/// <summary>
/// Registers the specified operation (pushes it to the undo stack, and clears the redo stack)
/// </summary>
public void Register(IUndoOp op)
{
undoStack.Push(op);
redoStack.Clear();
}