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Formerly MathJax in comments broke if you had too many consecutive non-blank spaces, and too many was a moderately large number. When it breaks, you see MathJax code in red letters rather than the intended rendered notation.

But today it's been breaking in that way very frequently in short expressions. Can that get fixed?

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  • $\begingroup$ E.g., I just suffered from this with $|f(x)-f(a)|=0<\epsilon$ in a comment (and I see it happens here again: Seem a space is introduced in the middle of epsilon $\endgroup$
    – Hagen von Eitzen
    Commented Aug 16, 2016 at 15:50
  • $\begingroup$ Testing $|f(x)-f(a)|=0<\upsilon$. And also Testing $|f(x)-f(a)|=0<\delta$ $\endgroup$
    – davidlowryduda Mod
    Commented Aug 16, 2016 at 15:52
  • $\begingroup$ @mixedmath Are you experimenting with redundant white space? $\endgroup$
    – Hagen von Eitzen
    Commented Aug 16, 2016 at 15:52
  • $\begingroup$ @HagenvonEitzen I was. I'm not quite sure what's up. But that it want to add a space exactly 4 characters into epsilon or upsilon and whatnot is a bit odd. $\endgroup$
    – davidlowryduda Mod
    Commented Aug 16, 2016 at 15:53
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    $\begingroup$ @mixedmath That's twenty characters without space (including the opening $). Used to be eighty. $\endgroup$
    – Daniel Fischer
    Commented Aug 16, 2016 at 16:03
  • $\begingroup$ @DanielFischer I'm a bit surprised that $\alpha\beta\gamma\delta\epsilon\zeta\eta\theta\iota\kappa\lambda$ renders fine. Oh! It doesn't! (I lied --- I thought I'd just tested that) Indeed, 20 characters seems to be a new thing. $\endgroup$
    – davidlowryduda Mod
    Commented Aug 16, 2016 at 16:04
  • $\begingroup$ If I guessed right and this has the same cause, things should be fixed (in code, not sure when the next build is rolled out, may take a bit). $\endgroup$
    – Daniel Fischer
    Commented Aug 16, 2016 at 18:35
  • $\begingroup$ Also, it doesn't seem to be just the break of commands, but fractions also don't center properly. More details here: meta.math.stackexchange.com/questions/24839/… (10k only, I deleted it when I realized ~3 minutes after posting that it was a dupe (oops...)) $\endgroup$
    – wythagoras
    Commented Aug 16, 2016 at 19:31
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    $\begingroup$ Test: \frac{\partial}{\partial x}: $\frac{\partial}{\partial x}$. \frac{\partial}{\par‌​tial\theta}: $\frac{\partial}{\par‌​tial\theta}$. $\endgroup$
    – Michael Hardy
    Commented Aug 16, 2016 at 19:39
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    $\begingroup$ When I wrote \frac{\partial}{\par‌​tial\theta} once today, the denominator looked fine but the numerator had $\text{“} {\partial} \text{''}$ off to the extreme left (but still above the horizontal bar). $\qquad$ $\endgroup$
    – Michael Hardy
    Commented Aug 16, 2016 at 19:41
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    $\begingroup$ @MichaelHardy I had it the other way around here: math.stackexchange.com/questions/1894301/…, where the numerator was fine but the denominator is off to the left, but still below the horizontal bar. $\endgroup$
    – wythagoras
    Commented Aug 16, 2016 at 19:45
  • $\begingroup$ @MichaelHardy $\frac{\partial}{\partial\theta}$ vs. $\frac∂{∂\theta}$ (\frac∂{∂\theta}) $\endgroup$
    – EKons
    Commented Aug 28, 2016 at 12:51

1 Answer 1

Reset to default
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A quick note. We know what's going on, it's a change which had some side effects. I'll take a stab very soon.

Update: It looks better now, as you need 60 consecutive unbroken characters to replicate instead of 20. However, it's not finished. Tomorrow I'll simply disable the line breaking shenanigans for comments that have MathJax in them.

Update: this is now fixed. Comments which contain mathjax do not receive separators.

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    $\begingroup$ So you wrote this stub about the stab. Nice. :P $\endgroup$
    – Asaf Karagila Mod
    Commented Aug 17, 2016 at 20:40
  • $\begingroup$ In case it might be relevant, today I had a comment in which a whitespace mysteriously appeared in the middle of a \equiv. (i.e. it split the word). The problem disappeared after an edit. Very strange. $\endgroup$
    – Bill Dubuque
    Commented Aug 17, 2016 at 21:26
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    $\begingroup$ @MichaelHardy's comment with a \partial in a fraction still seems to have an issue. $\endgroup$
    – LSpice
    Commented Aug 18, 2016 at 16:37
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    $\begingroup$ @LSpice this just came up in chat too A possible explanation is that in that comment the (non-visible) separator was included explicitly in the actual source of the comment (likely inadvertently via a copy paste) as opposed to being automatically inserted on rendering (which is now prevented). $\endgroup$
    – quid
    Commented Aug 18, 2016 at 16:43
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    $\begingroup$ @LSpice sorry for yet another comment but it just occurred to me how to test it. Copy the uncompiled \par‌​tial from that comment that does not render well (that is the last one) and use it by pasting it. This one will always break. But typing it out there will be no problem. $\par‌​tial$ $\par‌​tial$ $\par‌​tial$ $\partial$ $\par‌​tial$ $\par‌​tial$ $\par‌​tial$ $\partial$ (First three break.) Likely some editors could also show the character, but I don't have one handy (and/or do not know how to do it). $\endgroup$
    – quid
    Commented Aug 18, 2016 at 16:51
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    $\begingroup$ @quid, I can't figure out how to make Firefox display them, but pasting into vim with :set list indeed shows $\par<200c><200b>tial$ for the first 3 and plain ol' $\partial for the last. Thanks! $\endgroup$
    – LSpice
    Commented Aug 18, 2016 at 16:59
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    $\begingroup$ @LSpice. MichaelHardy's comment has some invisible characters embedded in the source. The rendering is perfect. $\endgroup$
    – Sklivvz
    Commented Aug 18, 2016 at 17:00
  • $\begingroup$ Indeed, @quid pointed that out above. Thanks! $\endgroup$
    – LSpice
    Commented Aug 18, 2016 at 17:23

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