[IMPROVE] Unfollow own threads (#15740)

app/threads/server/functions.js

@@ -5,7 +5,9 @@ export const reply = ({ tmid }, { rid, ts, u, editedAt }, parentMessage) => {
 		return false;
 	}
 
-	Messages.updateRepliesByThreadId(tmid, [parentMessage.u._id, u._id], ts);
+	const addToReplies = Array.isArray(parentMessage.replies) && parentMessage.replies.length ? [u._id] : [parentMessage.u._id, u._id];
+
+	Messages.updateRepliesByThreadId(tmid, addToReplies, ts);
 
 	const replies = Messages.getThreadFollowsByThreadId(tmid);
 

app/threads/server/hooks/aftersavemessage.js

@@ -47,7 +47,6 @@ const processThreads = (message, room) => {
 	}
 
 	const replies = [
-		parentMessage.u._id,
 		...parentMessage.replies || [],
 	].filter((userId) => userId !== message.u._id);