Follow-up Comment #5, bug #49390 (project groff):
Here are some exhibits. The first is a very simple reproducer for the
reported problem; the second illustrates that the same problem does _not_
occur when an unboxed table ends with a horizontal rule at the bottom, which
one might suspect could happen.
$ cat EXPERIMENTS/sayama-simpler.roff
foo
.TS
box;
L.
bar
.TE
baz
.pl \n(nlu
$ nroff -t -Tascii EXPERIMENTS/sayama-simpler.roff
foo
+----+
|bar |
baz--+
$ cat EXPERIMENTS/sayama-with-rule.roff
foo
.TS
L.
bar
_
.TE
baz
.pl \n(nlu
$ tgu -t -Tascii EXPERIMENTS/sayama-with-rule.roff
foo
bar
----
baz
We also see evidence of bug #62471, which vexes me and appears quite difficult
to address.
The fix for this, however, is straightforward.
diff --git a/src/preproc/tbl/table.cpp b/src/preproc/tbl/table.cpp
index 18cee1e92..dcf77b05d 100644
--- a/src/preproc/tbl/table.cpp
+++ b/src/preproc/tbl/table.cpp
@@ -3025,6 +3025,11 @@ void table::do_bottom()
".\\}\n");
if (flags & DOUBLEBOX)
prints(".sp " DOUBLE_LINE_SEP "\n");
+ // Horizontal box lines take up an entire row on nroff devices (maybe
+ // a half-row if we ever support [emulators of] devices like the
+ // Teletype Model 37 with half-line motions).
+ if (flags & (BOX | DOUBLEBOX | ALLBOX))
+ prints(".if n .sp\n");
prints("." RESET_MACRO_NAME "\n"
".fc\n"
".cp \\n(" COMPATIBLE_REG "\n");
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