[bug #63936] [tbl] rounding when using specific column widths can make text hug vertical rules in nroff mode

[G. Branden Robinson]

URL:
  <https://savannah.gnu.org/bugs/?63936>

                 Summary: [tbl] rounding when using specific column widths can
make text hug vertical rules in nroff mode
                   Group: GNU roff
               Submitter: gbranden
               Submitted: Thu 16 Mar 2023 09:55:29 PM UTC
                Category: Preprocessor tbl
                Severity: 3 - Normal
              Item Group: Rendering/Cosmetics
                  Status: None
                 Privacy: Public
             Assigned to: None
             Open/Closed: Open
         Discussion Lock: Any
         Planned Release: None


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Follow-up Comments:


-------------------------------------------------------
Date: Thu 16 Mar 2023 09:55:29 PM UTC By: G. Branden Robinson <gbranden>
Affects groff 1.22.4.

Observe the inconsistency in horizontal space after the central vertical rule
when the first column's width is changed from 2.5i to 2.75i.


$ cat ATTIC/specbox2.roff
.nf
1234567890123456789012345678901234567890123456789012345678901234567890
.TS
tab(@) allbox;
Cw(2.5i) Cw(2.5i)
L L.
Make@Model
Gibson@Les Paul
Fender@Stratocaster
.TE
.sp
.TS
tab(@) allbox;
Cw(2.75i) Cw(2.5i)
L L.
Make@Model
Gibson@Les Paul
Fender@Stratocaster
.TE
.pl \n(nlu


Output:


$ ./build/test-groff -t -Tascii ATTIC/specbox2.roff 
1234567890123456789012345678901234567890123456789012345678901234567890
+---------------------------+---------------------------+
|           Make            |           Model           |
+---------------------------+---------------------------+
| Gibson                    | Les Paul                  |
+---------------------------+---------------------------+
| Fender                    | Stratocaster              |
+---------------------------+---------------------------+

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









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