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Feature: Make winrt::event_token an internal implementation rather than a public interface #45

@YexuanXiao

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@YexuanXiao

Returning an event_token from the single‑parameter registration overload exists to support classes that do not implement IWeakReference or it is used to register a delegate in one event and unregister it in another event. However, because event_token itself merely stores an integer, unregistering a delegate via event_token is exception‑unsafe.

Solution:

Add an overload (winrt::auto_revoke_strong, Handler). This new overload returns a Revoker that holds a strong reference to this, making it work with any COM object.

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