Given an event previously returned by mkDecryptionFailureMatrixEvent, simulate a successful re-decryption attempt.
The event that will be decrypted.
New data for the successful decryption.
The content the event will have, once it has been decrypted.
The type the event will have, once it has been decrypted.
Given an event previously returned by mkDecryptionFailureMatrixEvent, simulate a successful re-decryption attempt.