[O] org-pretty-entities and symbols like M_x^y

[Laurent Hoeltgen]

Hi

I was wondering if there is a way to fontify expressions like M_x^y 
correctly with org-pretty-entities.

M_x^y displays the subscript x correctly but not the superscript y.
M^y_x displays the superscript y correctly but not the subscript x.

Regards,
Laurent