NSWindowRestoration protocol defines the method that restoration classes must implement to handle the recreation of windows. At launch time, the application object retrieves the restoration class and uses its
restoreWindow(withIdentifier:state:completionHandler:) method to obtain a new window whose type matches the type that was preserved previously. Classes that adopt this protocol can use the provided information to create (or obtain a reference to) the window in the new application. As part of creating the window, the class should also create any related objects, such as window controllers, normally used to manage the window.
- macOS 10.10+