On Mon, 28 Jan 2013, Wolfgang Schuster wrote:
I'll look into fractions later this week. All the fraction macros of ConTeXt
were based on \genfrac macro from AMSTeX so, in principle, they should behave
in the same manner.
The \frac command uses \vcenter for the content while \dfrac and \tfrac
only set the mathstyle before placing the content with the \over
primitive.
Then something has been lost in the MkII -> MkIV transition. I am pretty
sure (cannot check right now), that the code in MkII used \genfrac (which
is a fancy wrapper around \over \ovewithdelim etc)
Aditya
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