[bug #46914] .ce sometimes ignores right margin

[Dave]

Follow-up Comment #1, bug #46914 (project groff):

You can see the bug in nroff output too; just edit the example input file to
change the line length from 2i to 38n.  The terminal output from this (using
groff 1.23.0.rc1) is:


some  text  some  text  some text some
text some text  some  text  some  text
some  text  some  text  some text some
text some text

          some centered text

some text some  text  some  text  some
text  some  text  some  text some text
some text some  text  some  text  some
text some text

quite a bit more centered text in this case

some  text  some  text  some text some
text some text  some  text  some  text
some  text  some  text  some text some
text some text

so, quite a bit more centered text  in
              this case

some  text  some  text  some text some
text some text  some  text  some  text
some  text  some  text  some text some
text some text



The line beginning with "quite," which spills over the right margin, is what
this bug was originally opened to report.  But bug #60731 raises the question
of whether the actual bug above is in the output of the second or the third
.ce call.  _One_ of them seems to be wrong, since they handle the same
situation (input longer than the requested output line) differently (one
breaking the line, one overflowing the line length).

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