Enables the handler to signal to the Apps framework whether this handler should actually be executed for the message about to be updated.
The message which is being updated
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 updated.
The message about to be updated
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 updated
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Handler which is called to determine whether a user is allowed to update a message or not.