%B/%T outside Rs isn't Parsed: groff mismatch

%B/%T outside Rs isn't Parsed: groff mismatch

[наб]

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Hi!

-- >8 --
.Dd
.Dt STTY 1
.Os
.Sh DESCRIPTION
.%B Seventh Edition Ns -style
-- >8 --
produces
-- >8 --
D\bDE\bES\bSC\bCR\bRI\bIP\bPT\bTI\bIO\bON\bN
     S\b_e\b_v\b_e\b_n\b_t\b_h\b_ E\b_d\b_i\b_t\b_i\b_o\b_n\b_-style
-- >8 --
on groff, but
-- >8 --
STTY(1)                     General Commands Manual                    STTY(1)

D\bDE\bES\bSC\bCR\bRI\bIP\bPT\bTI\bIO\bON\bN
     _\bS_\be_\bv_\be_\bn_\bt_\bh _\bE_\bd_\bi_\bt_\bi_\bo_\bn _\bN_\bs _\b-_\bs_\bt_\by_\bl_\be

Linux 5.10.0-17-amd64                                    Linux 5.10.0-17-amd64
-- >8 --
on mandoc (CVS HEAD and 1.14.5-1 off Debian).

mdoc(7), In-line says:
  Macro   Callable   Parsed   Arguments
  %B      No         No       >0
so while I think this accurately reflects mandoc behaviour,
that's incompatible with groff.

In /usr/share/groff/1.22.4/tmac/doc.tmac I see, simplified:
  .de %B
  ...
  .ie \n[doc-is-reference] \{\
  ...
  .\}
  .el \{\
  .nop \*[doc-Em-font]\c
  .doc-print-recursive
  .\}
  ..
and likewise for %T: they are Parsed.

Best,
наб

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