Edit: After a little more testing the no line appears in all chats other than /say.
Edit: If you say this in real-id for example the text will appear what you wrote correctly.
I'm not too sure if this is an exploit, I just had nowhere to post it. Just to note, I didn't search on the forum because I wouldn't know what to search for, it's a bit hard to say exactly what this is, so I just posted it, apologies if it's a repost.
I just discovered this by typing a C++ function in-game: cout << "text \n";
I realised that the \n"; was being removed in-game and if I typed it without any other text, for example: /Whisper Name \n;
it would whisper them, but no text would appear and you'd still see the whisper / text in-game with no text, if you know what I mean
and if you do this in /say chat for example: /say \n; or /say \n"; it says: name says something unintelligible.
Perhaps this is already known or common knowledge, I don't know, decided to post it anyway, guess it has no real use apart from making a macro look more pretty by spacing things.