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Bug persists through 12.0.

I'm trying to produce a plot with PlotLabels that include sub- and superscripts. However, I haven't been able to do it consistently. Currently I'm trying to do this with the basic math assistant palette and the code is thus:

Plot[30, {x, 0, 605}, PlotStyle -> {Dashed, Thick, Black}, 
PlotLabels -> "\!\(\*SubsuperscriptBox[\(x\), \(s\), \(*\)]\)"]

But there is rather strange gap between the plot and the label which you can see from the picture below. Is there a way to move the label closer to the plot?

enter image description here

Running the same code without the sub and superscripts produces no issue.

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Looks like a bug in PlotLabels to me - my guess is that when measuring the size of the label, it does not take into account how big the rendered string will be, only the raw (rather long) string. A work-around is to wrap the label in Row@{...}:

Plot[30, {x, 0, 605},
 PlotStyle -> {Dashed, Thick, Black}, 
 PlotLabels -> Row@{
  "\!\(\*SubsuperscriptBox[\(x\), \(s\), \(*\)]\)"
 }
]

enter image description here

Other potential wrappers include StandardForm[...] and TraditionalForm[...] (which will render the label a bit differently) - essentially anything that hides the raw string from PlotLabels seems to do the trick.

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    $\begingroup$ Ah that explains why removing either the sub or the superscript only made the gap slightly shorter. I tried couple of workarounds with InputForm etc. without a positive results. However, Row seems to do it. Thank you. $\endgroup$ – Harto Saarinen Oct 15 '19 at 11:21
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    $\begingroup$ @HartoSaarinen Please consider writing a bug report on the issue to support(at)wolfram.com. $\endgroup$ – Alexey Popkov Oct 15 '19 at 11:59
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    $\begingroup$ Pane also works as well for a workaround $\endgroup$ – chuy Oct 15 '19 at 16:02

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