bug#25309: 11.89.8; multi-level script fontification stacks incorrectly

[Uwe Brauer]

>>> "Tassilo" == Tassilo Horn <address@hidden> writes:

   > Tassilo Horn <address@hidden> writes:

   >>> The only acceptable syntax is:
   >>> 
   >>> $a_{b_c}$
   >> 
   >> Ah, right.  That makes things a bit easier.  Basically, we can assume
   >> that in $a^{b^c}$ the {b^c} part is already fontified and risen, so in
   >> the case where we are going to fontify ^c we would need to
   >> increment/decrement the `raise' value.  I'll play around with this.

   > How about that?  (see the two screenshots, one with multi-level the
   > other with invisible)

Absolutely great. :-D