Re: mdocml: .Bl -column phrases ignore spacing rules for trailing

[Kristaps Dzonsons <kristaps@bsd.lv>]

schwarze@mdocml.bsd.lv wrote:
> Log Message:
> -----------
> .Bl -column phrases ignore spacing rules for trailing punctuation
> and render it just like normal text.
> Minimal fix of a formatting bug in operator(7) reported by ray@.
> 
> Modified Files:
> --------------
>     mdocml:
>         TODO
>         mdoc_term.c

This needs to be backed out, unfortunately: it causes fallout.

.Bl -column asdasdf asdfasdf
.It hallo . Ta world .     \" (1)
.It hallo .<TAB>world .    \" (2)
.It hallo . <TAB>world .   \" (3)
.El

Old/new groff:

      hallo.     world.
      hallo .    world.
      hallo.     world.

new mandoc:

      hallo .    world .
      hallo .    world .
      hallo .    world .

old mandoc:

      hallo.     world.
      hallo.     world.
      hallo.     world.

The fallout of case (1) is the biggest: Ta lists should not get 
IGNDELIM.  This is hard to switch on because the TAB-Ta switching is 
done in libmdoc, and is not exported to the formatter.

But I recall (2) and (3) being discussed.  It was agreed, without a 
clear solution, that the issue was the space-before-tab.

By following groff's logic, you'd have to say "if you have a tab 
directly after the last token in a list column, the punctuation will be 
considered normal text", which is not clear to a dummy like me anyway.

I suggest that we go with mandoc's old behaviour at the expense of this 
one issue.  It's easier to make unilateral statements: punctuation at 
the end of a list column, whether separated by Ta, tabs, tabs and 
spaces, etc., is treated as delimiting punctuation.

Note that mdoc.7 explicitly allows for quoted tab-separated `It' 
columns, which may be appropriate in this case.  Or just escaping the 
punctuation.  So the above would be modified "the un-quoted...".

Thoughts?

Kristaps
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