Update of bug #66932 (group groff):
Status: Confirmed => In Progress
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Follow-up Comment #4:
Okay, this seems to be straightforward.
It's all to do with the fact that we can overset lines when the input doesn't
permit a breakpoint, compounded by the fact that we don't apply
shrinking/squeezing to adjustable spaces (bug #44018).
The compounding fact is not fundamental; a user's output line need not
**have** any adjustable spaces, as can happen with perverse inputs
(unhyphenable character sequences and/or short line lengths) and more commonly
when adjustment is explicitly disabled.
I have a patch ready to go that removes this assertion and improves our
diagnostics.
$ printf '.ll 2n\n\\~AB\n' | ./build/test-groff -a
<beginning of page>
troff: warning [page 1, 0.0i]: cannot break line
troff: warning [page 1, 0.0i]: cannot adjust line; overset by 6390 units
AB
$ printf '.ll 2n\n\\~AB\n' | ./build/test-groff -a -T ascii
<beginning of page>
troff: warning [page 1, line 1]: cannot break line
troff: warning [page 1, line 1]: cannot adjust line; overset by 24 units
AB
$ printf '.ll 2n\nABC\n' | ./build/test-groff -a
<beginning of page>
troff:<standard input>:2: warning [page 1, 0.0i]: cannot break line
ABC
I played with trying to coalesce these 2 warnings into one. That did not fly
for very long.
1. They are thrown at different points in the code--different functions,
even. I think right now that if adjustment is disabled `distribute_space()`
is never even called. But that's the only function that knows the magnitude
of overset, or how many adjustable spaces (`nspaces`) are on the output line.
2. They are logically distinct operations, as noted and illustrated above.
In the final example, no adjustment can take place because no adjustable
spaces exist.
3. I settled for annotating the places in the code that I can see will be
involved in a future resolution of bug #44018.
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