[XeTeX] Handling of combining and variant selector characters in math

[David J. Perry]

On 2/10/2016 5:34 PM, David Carlisle wrote:
> Note I was using Khaled's xits-math variant not the original stix 
> version, xits-math has many improvements to the opentype internals. 
> The VS1 combinations in xits-math work for example in firefox. David
Thanks, David.  I downloaded the XITS fonts today from github, so I 
assume I have the most recent.  I will poke around some more and see if 
I can figure out how Firefox is accessing the variants.