[groff] 08/32: tmac/fallbacks.tmac: Mitigate Savannah #63332.

[G. Branden Robinson]

gbranden pushed a commit to branch master
in repository groff.

commit 563fd71746331f5feafe87a468d0326e8bfc8786
Author: G. Branden Robinson <g.branden.robinson@gmail.com>
AuthorDate: Sun Nov 27 03:30:38 2022 -0600

    tmac/fallbacks.tmac: Mitigate Savannah #63332.
    
    * tmac/fallbacks.tmac: Comment out four of the fallback character
      definitions for (preconv'd) Unicode character input added to address
      Savannah #58930 (corresponding to \[dg], \[dd], \[%0], and \[rn]; they
      are failing for not yet understood reasons involving "macros" attached
      to groff character info structs, and the semantics of what it means
      for a character to "exist" per the 'c' conditional operator.  Fixes
      regression when using "tty-char.tmac" (which nroff loads by default).
      Problem introduced by me in commit 132182bd71, 23 October.  The hope
      is to resolve this issue post-groff 1.23.0.  Thanks to Dave Kemper for
      the report and discussion in Savannah #63332.
---
 ChangeLog           | 14 ++++++++++++++
 tmac/fallbacks.tmac |  9 +++++----
 2 files changed, 19 insertions(+), 4 deletions(-)

diff --git a/ChangeLog b/ChangeLog
index a93ca20d5..badd6d8dd 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,17 @@
+2022-11-27  G. Branden Robinson <g.branden.robinson@gmail.com>
+
+       * tmac/fallbacks.tmac: Comment out four of the fallback
+       character definitions for (preconv'd) Unicode character input
+       added to address Savannah #58930 (corresponding to \[dg], \[dd],
+       \[%0], and \[rn]; they are failing for not yet understood
+       reasons involving "macros" attached to groff character info
+       structs, and the semantics of what it means for a character to
+       "exist" per the 'c' conditional operator.  Fixes regression when
+       using "tty-char.tmac" (which nroff loads by default).  Problem
+       introduced by me in commit 132182bd71, 23 October.  The hope is
+       to resolve this issue post-groff 1.23.0.  Thanks to Dave Kemper
+       for the report and discussion in Savannah #63332.
+
 2022-11-25  G. Branden Robinson <g.branden.robinson@gmail.com>
 
        * tmac/an-ext.tmac (SY, YS, mV): Remove `mA`, `mI`, and `mT`
diff --git a/tmac/fallbacks.tmac b/tmac/fallbacks.tmac
index 633dbc711..9ba22c0f5 100644
--- a/tmac/fallbacks.tmac
+++ b/tmac/fallbacks.tmac
@@ -167,20 +167,21 @@
 .fchar \[u2019] \[cq]\" right single quotation mark
 .fchar \[u201C] \[lq]\" left double quotation mark
 .fchar \[u201D] \[rq]\" right double quotation mark
-.fchar \[u2020] \[dg]\" dagger
-.fchar \[u2021] \[dd]\" double dagger
+.\" XXX: The next two are troublesome; see Savannah #63332.
+.\"fchar \[u2020] \[dg]\" dagger
+.\"fchar \[u2021] \[dd]\" double dagger
 .fchar \[u2022] \[bu]\" bullet
 .fchar \[u2024] .\" one dot leader
 .fchar \[u2025] .\|.\" two dot leader
 .fchar \[u2026] .\|.\|.\" horizontal ellipsis
 .fchar \[u2027] \[pc]\" hyphenation point
-.fchar \[u2030] \[%0]\" per mille sign
+.\"fchar \[u2030] \[%0]\" per mille sign \" Savannah #63332 again
 .fchar \[u2032] \[fm]\" prime
 .fchar \[u2033] \[sd]\" double prime
 .fchar \[u2039] \[fo]\" left single chevron
 .fchar \[u203A] \[fc]\" right single chevron
 .if t .fchar \[u203D] \o'?!'\" interrobang
-.fchar \[u203E] \[rn]\" overline
+.\"fchar \[u203E] \[rn]\" overline \" Savannah #63332 again
 .fchar \[u2044] \[f/]\" fraction slash
 .fchar \[u2052] %\" commercial minus sign
 .fchar \[u2053] \[ti]\" swung dash