[XeTeX] OpenType Math kerning (cut-ins)

[Joel C. Salomon]

Consider the attached files (requires a recent version of
unicode-math).  There does not seem to be any kerning of f_k, even in
Cambria Math where it's most obviously needed.

I recall from Rhatigan's TUG 2008 presentation "Three typefaces for
mathematics" (based on his thesis; see
<http://ultrasparky.org/school/pdf/DanielRhatigan_Dissertation.pdf>,
pp. 36–37) that OpenType Math fonts have somewhat complicated kerning
(cut-ins) for super-/sub-scripts.  Is support for these implemented in
XɘTeX?

—Joel Salomon
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