[bug #65102] mdoc nroff output for Dt broken since 1.23

[anonymous]

URL:
  <https://savannah.gnu.org/bugs/?65102>

                 Summary: mdoc nroff output for Dt broken since 1.23
                   Group: GNU roff
               Submitter: None
               Submitted: Sun 31 Dec 2023 10:29:56 PM UTC
                Category: Macro mdoc
                Severity: 3 - Normal
              Item Group: Incorrect behaviour
                  Status: None
                 Privacy: Public
             Assigned to: None
             Open/Closed: Open
         Discussion Lock: Any
         Planned Release: None


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Follow-up Comments:


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Date: Sun 31 Dec 2023 10:29:56 PM UTC By: Anonymous
Downstream bug: https://bugs.debian.org/1059536, part 2.

Dt is misrendered but only in nroff mode.
Given

  .Dt A_B_C 9

In troff mode, and in 1.22.4-10, the top left and right corners were
"A_B_C(9)".
In 1.23.0-3 in nroff they are "\fIA_B_C\fP(9)", which:
(a) why would you need this?
(b) completely breaks manuals with underscores in the name,
    because "\fIA_B_C\fP(9)" and "A_B_C(9)" and "\fIA B C\fP(9)"
    are all drawn identically.
I didn't have the time or the energy to root-cause this.







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