I'm actually a little surprised this question hasn't been asked before. Now that I think about it, it's probably best that delta indexing doesn't happen during the full index (although the impact if both happen at once is very likely negligible). That said, having the two processes aware of each other could be a little tricky.
I guess at this point, I'm not planning on writing any patches to handle these situations, but feel free to take a stab at it yourself if you're keen.
--
Pat
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