[XeTeX] combining characters in isolation

[David Perry]

Thanks for sharing this, Mike.

> So apparently setting the script makes it pay 
> attention to whether there is a Bengali base character for the combining 
> character to combine with.  But not specifying the script causes other 
> problems, namely the combining characters don't combine correctly with a 
> Bengali base character when there is one (which of course is most of the 
> time).
That actually sounds like the way it ought to work, as I think about it.

David