[bug #65884] [mm] with \n[Pt]=2, indentation not restored correctly after implicit paragraph

[G. Branden Robinson]

URL:
  <https://savannah.gnu.org/bugs/?65884>

                 Summary: [mm] with \n[Pt]=2, indentation not restored
correctly after implicit paragraph
                   Group: GNU roff
               Submitter: gbranden
               Submitted: Sat 15 Jun 2024 11:02:35 AM UTC
                Category: Macro package mm
                Severity: 4 - Important
              Item Group: Incorrect behaviour
                  Status: In Progress
                 Privacy: Public
             Assigned to: None
             Open/Closed: Open
         Discussion Lock: Any
         Planned Release: None


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Follow-up Comments:


-------------------------------------------------------
Date: Sat 15 Jun 2024 11:02:35 AM UTC By: G. Branden Robinson <gbranden>
This is a regression from _groff_ 1.22.4 behavior affecting 1.23.0,
unfortunately.  Setting severity to Important to flag it for anyone interested
in backporting.

The scenario is this, which is idiomatic for _mm_ authors.


$ cat ATTIC/Pt-2-blues.mm
.nr Pt 2
.H 1 "Heading Two"
P12 not indented.
.P
P13 indented.
$ nroff -mm ATTIC/Pt-2-blues.mm | cat -s

                                   ‐ 1 ‐

       1.  Heading Two

       P12 not indented.

       P13 indented.



_groff_ 1.22.4 got this right (but not indentation suppression after lists and
displays).

I have a fix in preparation.







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