Follow-up Comment #2, bug #67310 (group groff): Here's some further practical background.
commit b65066ea49c34b92f255a7e9dde62b31b296ea5f
Author: G. Branden Robinson <g.branden.robin...@gmail.com>
Date: Thu Jul 17 16:13:33 2025 -0500
[mdoc]: Disable hyphenation less aggressively.
* tmac/doc.tmac (doc-parse-args, doc-parse-arg-vector)
(doc-enclose-close, doc-inset-list, doc-hang-list)
(doc-ohang-list, doc-diag-list, doc-tag-list, Fc)
(doc-print-reference): Stop invoking `nh` request. This package's
bespoke internal macro reprocessing system aggressively exercises
Savannah #67310 (a missing feature in the formatter); with these
requests in place, automatic hyphenation was getting disabled in far
more places than it should have been, and because there appears to be
no mechanism for reënabling it when departing the appropriate nested
scope, it's simpler to just stop trying. Making this change had no
measurable effect on formatting of groff_mdoc(7), except with respect
to the formatting of URL link text, which has seen heavy revision
since groff 1.23.0 anyway.
(Lk): Macro now does what more mdoc(7) documents should probably have
already been doing: employ the `\%` escape sequence in appropriate
places. (Alternatively, those who enjoy mandoc(1)'s approach can
disable automatic hyphenation altogether at formatting time by setting
the `HY` register to zero in "mdoc.local" or on the command line.)
This change eliminates the one regression noted above.
* tmac/tests/doc_indents-correctly.sh: Update test expectations, now
that (sub)section headings that are so long that they break can also
hyphenate.
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