This answer to my question was deleted by its author about a half hour after posting. He edited it some and undeleted it. I come back to the site and do not find any notification of a new answer to my question. I assume what happened is this: The answer generated a notification, but its deletion deleted that notification and its undeletion did not generate a new one. So I didn't know I had a new answer to my question until someone happened to alert me to it.
(Note: it was in my notifications list (until it was just re-deleted), but not in the top-of-page inbox-notifier.)
This seems like a bug; or, at least, something that should IMO, as a new feature, be changed.