Follow-up Comment #7, bug #54101 (project groff):
Dave, I think you're incorrect about inter-sentence spaces being "fixed", not
adjusted. Please try the following with `groff -Tutf8` (or `nroff`, whatever
:P ).
>From what I can tell, not only does the inter-sentence space get adjusted,
it's adjusted _before_ inter-word spaces are.
At least for grotty, where things are blissfully easy to measure.
.pl 1v
.\".ll 70n \" both inter-word and inter-sentence spaces adjusted
.\".ll 65n \" only inter-sentence spaces adjusted
.ll 60n \" neither adjusted
.ss 12 48
.tm
12345678901234567890123456789012345678901234567890123456789012345678901234567890
1.\& J.\& Fict.\& Ch.\& Soc.\& 6 (2020), 3\[en]14.
2.\& Better known for other work.
Play around with the commented `.ll` lines to see the results.
I'm not going to close this as invalid because I think you're absolutely right
that the documentation is inadequate on this point. The issue has come up at
least once a year on the groff mailing lists, which is a high frequency for
our volume of traffic. I'm got a revamp in progress.
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