This class may be instantiated; it is not intended to be subclassed.
This method automatically registers listeners so that it can keep its enablement state up to date. Ordinarily, the window's references to these listeners will be dropped automatically when the window closes. However, if the client needs to get rid of an action while the window is still open, the client must call #dispose() to give the action an opportunity to deregister its listeners and to perform any other cleanup.
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