Enables the handler to signal to the Apps framework whether this handler should actually be executed for the message about to be deleted.
The message which is being deleted
An accessor to the environment
An accessor to the outside world
whether to run the prevent or not
Method which is to be used to prevent a message from being deleted.
The message about to be deleted
An accessor to the environment
An accessor to the outside world
An accessor to the App's persistence storage
whether to prevent the message from being deleted
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Handler which is called to determine whether a user is allowed to delete a message or not.