Sometimes I leave a comment, then think better of it -- perhaps I decide to answer instead. If I delete the comment, does the user still get notified that new comments are available or does the notification take this into account? Are the comments hard-deleted or soft-deleted?
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The answer is yes. From my experience you will always get a notification.
The same also goes for answers to your questions.
I have noticed this usually has a latency probably due to caching.
If you don't delete it immediately though, the person should get a notification.