[bug #43636] tbl: double horizontal rule in nroff

[Anthony J. Bentley]

URL:
  <http://savannah.gnu.org/bugs/?43636>

                 Summary: tbl: double horizontal rule in nroff
                 Project: GNU troff
            Submitted by: anthonyjbentley
            Submitted on: Wed 19 Nov 2014 01:15:22 PM GMT
                Severity: 3 - Normal
              Item Group: None
                  Status: None
                 Privacy: Public
             Assigned to: None
             Open/Closed: Open
         Discussion Lock: Any
         Planned Release: None

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Details:

Consider the following (from fceux(6)):

.TS
center box;
cb | cb, c | ci.
NES Gamepad     Keyboard
=
Up      Keypad Up
.TE

nroff(1) displays it as:

                           
┌────────────┬──────────────┐
                            │NES Gamepad │   Keyboard   │
                           
├────────────┼──────────────┤
                            │   Up       │  Keypad Up   │
                           
└────────────┴──────────────┘

Or in -Tascii:

                            +------------+--------------+
                            |NES Gamepad |   Keyboard   |
                            +------------+--------------+
                            |   Up       |  Keypad Up   |
                            +------------+--------------+

It would make more sense to render the middle horizontal line with a double
border ('=' in ASCII, '═' in Unicode). Both  groff and mandoc render this
with a double border in the middle.




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