Detectiing footnotes in Lua scripts

[jcr <ffi.appdev-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>]

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I find in Lua filters that I sometimes would like to know whether or not 
I'm in a footnote. Currently, I'm trying to move punctuation before 
footnotes. Given my citation style, I know that a Cite in body text will 
produce a footnote, while a Cite in a footnote will not. So I want to move 
punctuation before a Cite when it's not in a footnote. Since a filter 
function for Inlines will descend into footnotes as well, there doesn't 
seem to be any way to tell when the Cite is in a footnote.

In this particular case, I can work around the limitation because any Cite 
in a footnote will either be the first element or will have a Space before 
it. So with that assumption, I can look for the last innermost element 
before the Cite and check its type: if it's a Str,  can append the 
punctuation to it and delete the punctuation from where it was. if it's a 
Space, I do nothing, because I must be in a footnote. However, at least in 
the long term, I'd like to be able to tell whether or not I'm in a footnote.

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