[bug #61597] [tbl] support "0" modifier for "|" column classifier

[G. Branden Robinson]

Follow-up Comment #6, bug #61597 (project groff):

As part of this we should decide upon and document the semantics of combining
the | classifier (with and without the "0" modifier) when it interacts with
manually-specified column widths.

Consider the following input.


$ cat ATTIC/specbox.roff 
.nf
1234567890123456789012345678901234567890123456789012345678901234567890
.TS
tab(@);
Lw10 Lw10.
WWWWWWWWWW@XXXXXXXXXX
.TE
.sp
.TS
tab(@);
Lw10 0 Lw10.
YYYYYYYYYY@ZZZZZZZZZZ
.TE
.sp
.TS
tab(@);
Lw10 |0 Lw10.
one@two
.TE
.sp
.TS
tab(@) allbox;
Cw(2.5i) | Cw(2.5i)
Lw(2.5i) | Lw(2.5i).
Make@Model
Gibson@Les Paul
Fender@Stratocaster
.TE
.pl \n(nlu


And observe the output.


$ ./build/test-groff -t -Tascii ATTIC/specbox.roff
1234567890123456789012345678901234567890123456789012345678901234567890
WWWWWWWWWW   XXXXXXXXXX

YYYYYYYYYYZZZZZZZZZZ

          |
one       two

+---------------------------+---------------------------+
|           Make            |           Model           |
+---------------------------+---------------------------+
| Gibson                    | Les Paul                  |
+---------------------------+---------------------------+
| Fender                    | Stratocaster              |
+---------------------------+---------------------------+


(This is from my working copy, but groff 1.22.4 produces the same output
except for bug #63449, which hides the vertical space that should be
observable above the "one two" table, and commit
[https://git.savannah.gnu.org/cgit/groff.git/commit/?id=8f066786ea3cb5e1dbade1149e7d50ae978da202
8f066786ea].)

The issue to note here is that the "t" in "two" overprints the vertical rule
between columns.  That's ugly.


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