[luatex] Poor Spacing in the \frac Environment

[Reinhard Kotucha]

On 2015-01-18 at 23:52:39 -0500, Emil E wrote:

 > I've also noted that LuaLaTeX is making the correct adjustments for
 > superscripted denominators (ex. a denominator of \delta^{2}), but
 > this _only_ occurs on the LuaLaTeX engine with OTF TeX Gyre Pagella
 > fonts (it does not happen on LuaLaTeX Computer Modern defaults, or
 > in PDFLaTeX).
 > This can be seen in the top right section of the linked image,
 > on the third and fourth fractions from the right.

I don't think that LuaLaTeX does any correction here.  I suppose that
the position of the superscript is a little bit too heigh in TG
Pagella so that TeX has to lower the complete denominator accordingly.

The same happens if you insert the line

  \frac{\Big|\delta}{\Big|\gamma} \;

Regards,
  Reinhard

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