Re: table borders don't span entire width

[Ingo Schwarze <schwarze@usta.de>]

Hi Anthony,

Anthony J. Bentley wrote on Fri, Feb 08, 2019 at 02:43:45PM -0700:

> In response to a mailing list question

I marvel that you understood that question.
I looked at it and didn't understand a word...

> I tried out an example from The Awk Programming Language.
> The tbl(7) source it generates looks in part like this:
> 
> .TS
> center;
> n n n n.
> _	_	_	_
> 2173	77.1	13765	53.6
> =	=	=	=
> .TE
> 
> groff creates solid lines as in the book:
> 
>                    ---------------------------
>                    2173   77.1   13765   53.6
>                    ---------------------------
> 
> But mandoc breaks the lines between cells:
> 
>                           ----   ----   -----   ----
>                           2173   77.1   13765   53.6
>                           ====   ====   =====   ====

That looks like a bug.
Here is what the tbl(7) manual page says:

     If a data cell contains only the single character '_' or '=',
     a single or double horizontal line is drawn across the cell,
     joining its neighbours.  If a data cells contains only the two
     character sequence '\_' or '\=', a single or double horizontal
     line is drawn inside the cell, not joining its neighbours.

> Side note: while using = for the double line is an improvement over
> groff, in UTF-8 the double line is output with U+2501. Wouldn't U+2550
> be more appropriate? The typeset output displays a double line, not a
> heavy line.

I think i did that because the heavy lines looked better to me,
but it's not the first time someone asks, so maybe i should change it.
Adjusting borders_utf8[] in tbl_term.c is probably all that is needed.

Yours,
  Ingo
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