[bug #60571] Footnote markers defeat end-of-sentence recognition

[Dave]

Follow-up Comment #1, bug #60571 (project groff):

In the Heirloom troff bug tracker, a contributor suggested creating a
mechanism to explicitly indicate end of sentence that would augment the
existing heuristics.

>From http://github.com/n-t-roff/heirloom-doctools/issues/83:

"I would like... a way to actively identify the end of a sentence, in addition
to the passive mechanism we have now. ... It isn't really practical to
identify every character that could be a transparent character--superscripts,
for example, could be nearly anything [0-9, A-Z, a-z], and they might come
from the ASCII set (reduced in size and shifted up) or be dedicated glyphs....
Then there are the various quotation marks, not to mention hot links (and, of
course, macros that process note numbers)."

It's not clear to me whether Heirloom troff is actively maintained anymore,
but if anyone is nominally in charge of its future direction, it would be good
to coordinate with them to come up with a portable system.

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