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On several recent occasions, after closing a question as a possible duplicate the automatic banner breaks the $\LaTeX$ requiring manual intervening.

I don't recall it was like that before, and I suppose that something was changed in the way the system fetches the question's title. It does not break in the announcing comment automatically added when first suggesting a duplicate, though.

One recent example is Vector space over $F_p$ not the union of $k\leq p$ subspaces, but I recall doing that at least once more in the past week.

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  • $\begingroup$ It always was like that since I'm here, it was brought up a long time ago in this thread. I don't quite understand the fix that was made but obviously it doesn't really work or at least it doesn't handle all exceptions. $\endgroup$
    – t.b.
    Commented May 25, 2012 at 11:13
  • $\begingroup$ @t.b.: Interesting. Well, I guess that [status-completed] is not really completed after all. (Perhaps a recent change broke the fix?) $\endgroup$
    – Asaf Karagila Mod
    Commented May 25, 2012 at 11:14
  • $\begingroup$ No, I don't think so. I seem to remember to have fixed broken LaTeX in duplicate links during the entire time I'm here. $\endgroup$
    – t.b.
    Commented May 25, 2012 at 11:15
  • $\begingroup$ @t.b.: Your first comment here is from two minutes, that's not a long time. :-P (I don't remember fixing duplicate banners before last week and I don't remember anyone else fixing... but my memory is huge holes in it.) $\endgroup$
    – Asaf Karagila Mod
    Commented May 25, 2012 at 11:17
  • $\begingroup$ Here's an example of an older post where a similar thing happened as in the example you bring up here. Just in case it is related: here's another meta-question where problems with inequality signs were brought up. $\endgroup$
    – t.b.
    Commented May 25, 2012 at 11:33
  • $\begingroup$ @t.b.: I see. Then I suppose either the developers see that the problem persists, or once again we'll have a "next deployment..." and [status-completed]. $\endgroup$
    – Asaf Karagila Mod
    Commented May 25, 2012 at 11:37

2 Answers 2

Reset to default
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Fixed in build rev 2014.1.21.1317

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This is similar to the bug t.b. linked to in comments. However, the issue there was caused by escaping backslashes (with another backslash) in order to prevent them being interpreted incorrectly by the Markdown renderer (not necessary within MathJax).

This one involves escaping already-escaped HTML entities. Greater-than and less-than symbols are normally escaped automatically when the title is formatted for the duplicate link. When processing MathJax sections, ampersands are escaped. So > becomes > in the final output, which doesn't do anything good.

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  • $\begingroup$ My experience is that when someone copy-paste a compiled MathJax output the result is HTML. It seems as though the dup. banner is doing something similar, although not exactly. $\endgroup$
    – Asaf Karagila Mod
    Commented May 26, 2012 at 9:36

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