DescriptionIssue 2632: Allow multiple occurences of Footnote_engraver
Don't treat footnote events that already emitted footnotes in a subordinate context.
Patch Set 1 #Patch Set 2 : Avoid multiple tweakish footnotes. #Patch Set 3 : Rebase on issue 2636, deactivate grobs and (somewhat more icky) events after footnoting #
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