[luatex] luatex misalignment of certain diacritics in certain LaTeX environments

[Benjamin Slade]

I just noticed that the Unicode characters didn't come through properly.

Here it is at Pastebin: http://pastebin.com/FWaPv4JT

Original message:
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I've noticed that certain diacritics---including over-dots, under-rings,
but not acute accents or macrons---are misaligned by the luatex engine
when they occur in tabular or hbox environments (and also in the
linguistics example/glossing packages linguex and expex). When compiled
with xetex, these misalignments do not occur.

 Is this a known issue?

 I include a (fairly)
minimal illustrative example below. (Compare alignment of over-dot and
under-ring in source and in luatex vs xetex outputs.)
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