[bug #64300] [troff] diagnose error when 'sp used when not on a page

[G. Branden Robinson]

URL:
  <https://savannah.gnu.org/bugs/?64300>

                 Summary: [troff] diagnose error when 'sp used when not on a
page
                   Group: GNU roff
               Submitter: gbranden
               Submitted: Mon 12 Jun 2023 09:31:41 PM UTC
                Category: Core
                Severity: 3 - Normal
              Item Group: Warning/Suspicious behaviour
                  Status: None
                 Privacy: Public
             Assigned to: None
             Open/Closed: Open
         Discussion Lock: Any
         Planned Release: None


    _______________________________________________________

Follow-up Comments:


-------------------------------------------------------
Date: Mon 12 Jun 2023 09:31:41 PM UTC By: G. Branden Robinson <gbranden>

$ cat EXPERIMENTS/no-break-sp-request-behavior-exhibit.roff
'sp 3v \" does nothing because not on a page yet: diagnose error?
foo
.br
bar
'sp 3v
baz
$ nroff EXPERIMENTS/no-break-sp-request-behavior-exhibit.roff | cat -n | head
     1  foo
     2
     3
     4
     5  bar baz
     6
     7
     8
     9
    10


The formatter sullenly ignores a no-break `sp` request if the vertical drawing
position is negative.

This is _not_ what DWB or Heirloom Doctools nroff do.


$ ./bin/nroff ./no-break-sp-request-behavior-exhibit.roff | cat -n | head
     1
     2
     3  foo
     4
     5
     6  bar baz
     7
     8
     9
    10


We should either align with them or throw an error and document the
difference.







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