Let FormatStrFormatter respect axes.unicode_minus. #27602
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This is better than the workaround of wrapping the expression in
mathtext (as suggested for the old-style FormatStrFormatter) because it
also works for the hover tooltip in the toolbar (which cannot display
mathtext).
Note that it is not as easy to do so for FormatStrFormatter
(%-formatting) as that would require manually parsing the format string;
I would not bother as that formatter seems to be mostly present for
backcompat.
Goes on top of #27601.
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