I wanted to give the update part of this question, as a comment. It is impossible, and I see the following: "Only one additional @user can be notified..."
So I add that comment as the update part within the question. Now I don't need to give the comment. But I think it is a bug and can be corrected.

  • 2
    $\begingroup$ Did you want to post this:` $\require{AMScd}$ \begin{CD} 0 @>>> S @>\alpha>> S^2 @>\beta>> S @>>>0\\ @. @V id V V @VV id V @VV id V \\ 0 @>>> S @>\gamma>> S^2 @>\theta>> S @>>>0 \end{CD} $\endgroup$
    – quid Mod
    Feb 26, 2017 at 17:21
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    $\begingroup$ Yes, and u fix it by a "`"? Still i believe it's better the bug to be corrected. $\endgroup$
    – user 1
    Feb 26, 2017 at 17:26
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    $\begingroup$ It's not really a bug. It is just that the test for a feature is "stupid" and catches this as false positive. I doubt it's worth it to try to make the tes smarter. The backtick-exception is there for such cases and works well enough. Anyway the content was better as edit than as comment. $\endgroup$
    – quid Mod
    Feb 26, 2017 at 17:28

1 Answer 1


I am not exactly certain I understand what is your concern, but I believe I finally understood what it might be.

It is by design that only one user can be @-notified per comment. If you want to change this, I doubt this will happen.

However, it seems this is not your actual concern. Rather it is that you wanted to submit a comment containing something like:

  0 @>>>     S @>\alpha>>       S^2 @>\beta>>    S @>>>0\\
@.      @V id V V   @VV id V     @VV id V           \\
  0 @>>>     S @>\gamma>>       S^2 @>\theta>>    S @>>>0

Due to the many @ this triggers the test for multiple notifications, and blocks submission of the comment. Granted this test is apparently implemented in a simplistic way (just checking for @).

However, there is a dedicated feature to side-step the test namely inserting a backtick (`) somewhere in the comment. Doing this you could submit your comment just fine.

I feel this is sufficient and would not consider making that test smarter a particular concern.


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