Hehe, nice catch. Fixed in the next build. Here's what happened:
- Felix Kling voted to close as a dupe; thus the automatic "possible duplicate of…" comment was posted.
- Other users voted to close, and eventually the question was closed and the auto-comment removed.
- denys281 (the OP) posted the comment that (later) ended up in your Inbox. He posted this comment shortly after step 2 (probably before refreshing the page to see that the question was closed and the comment gone).
- You posted your If you "don't really understand the answers"… comment.
- The OP edited their comment.
We don't keep a revision history of comments, so I don't know what was changed in step 5, but it doesn't really matter. In particular the whole question of
@ Felix vs.
@Felix vs. no
@ at all is not significant here.
What matters is that when a comment is edited, the check for "who is this in reply to" is re-done. This re-check (and here's the bug) considered all comments that existed at the time of editing, even if they were posted after the edited comment was originally posted.
Thus that check saw that there was a comment from you (step 5), and the edited comment was from the post owner. No other comments were present (step 2). Thus the "conversation between post owner and only one other person" logic took effect, making the comment a reply to you (the "other person").
This missing "only consider comments posted before this one was originally posted" check is added in the next build.