Follow-up Comment #2, bug #67509 (group groff): The "HEAD" of our Git repository's master branch has the following test outcomes.
$ ../src/roff/groff/tests/asciify-request-works.sh && echo PASSED
<beginning of page>
!!
foobarbaz A<dq><'e><'a>C<aa>i<fl>of<fl>ZYX 1@2@3@4@5@6@7@8@9@ 10@
11@12@13@jat14@
antimatter15@16@17@18@19@20@21@22@23@visible24@25@
checking textification of ordinary character 'A'
checking textification of special character 'dq'
checking textification of composite special character 'e aa'
checking textification of Unicode special character with Latin-1 mapping
'u00E1'
checking textification of decomposable (with Basic Latin base character)
Unicode special character 'u0106'
checking textification of ligature special character 'fl'
checking textification of ligature special character 'Fl'
checking textification of user-defined special character 'Z'
checking textification of dummy character escape sequence
checking textification of EOS-transparent dummy character escape sequence
checking textification of output line continuation escape sequence
checking textification of tag request
checking textification of device extension escape sequence
checking textification of vertical motion escape sequence
checking textification of (tab) horizontal motion escape sequence
checking textification of (plain) horizontal motion escape sequence
checking textification of unadjustable space escape sequence
checking textification of unbreakable space escape sequence
checking textification of hyphenless break point escape sequence
checking textification of uninterpreted leader escape sequence
checking textification of non-diverted uninterpreted character sequence escape
sequence
checking textification of diverted uninterpreted character sequence escape
sequence
checking textification of hyphenation inhibitor escape sequence
checking textification of bracket-building escape sequence
checking textification of diverted 'sp' request
checking textification of drawing escape sequence
checking textification of extra leading escape sequence
checking textification of horizontal rule escape sequence
checking textification of vertical rule escape sequence
checking textification of overstriking escape sequence
checking textification of drawing position reset escape sequence
checking textification of diverted 'trf' request
PASSED
Most of the last 75 commits have been turned to this task.
1 05036f82e src/roff/troff/node.cpp: Refactor.
2 ae0adea18 [man,mdoc]: Fix Savannah #67474 (`.cflags 0 "`).
3 c4bed3131 [troff]: Update source code annotations.
4 ee2011b6c tmac/fallbacks.tmac: Fix Savannah #66653.
5 c642f5fc7 [troff]: Regression-test Savannah #66653.
6 1a38b319a [troff]: Refactor `node` class hierarchy.
7 7ad201f5e [troff]: Refactor.
8 7f0e55ae5 [groff]: Add test case for asciify of div `'trf`.
9 eb1fba607 src/roff/troff/input.cpp: Trivially refactor.
10 803baa718 src/roff/troff/input.cpp: Trivially refactor.
11 63984ee58 [troff]: Fix Savannah #67532 (diverted `trf`).
12 bef341817 [troff]: Regression-test Savannah #67532.
13 db0923eb0 [troff]: "Asciify" zero-width nodes.
14 d0d73e5af [groff]: Add test case for `asciify` of `\Z`.
15 f2e672d31 [troff]: "Asciify" suppressed nodes as nothing.
16 040bb7565 [troff]: "Asciify" `suppress` nodes as nothing.
17 638b2c06b [groff]: Add test case for `asciify` of `\O`.
18 2b2b1cc29 [troff]: "Asciify" `overstrike` nodes as nothing.
19 c5a5280ff [groff]: Add test case for `asciify` of `\o`.
20 907c0f26e [troff]: "Asciify" `vline` nodes as nothing.
21 3f40616e7 [groff]: Add test case for `asciify` of `\L`.
22 c0928359e [troff]: "Asciify" `hline` nodes as nothing.
23 06adeef5a [groff]: Add test case for `asciify` of `\l`.
24 3b25bb3f3 [troff]: "Asciify" extra space nodes as nothing.
25 e70c178f5 [groff]: Add test case for `asciify` of `\x`.
26 6863587f9 [troff]: "Asciify" draw nodes as nothing.
27 7ca553428 [groff]: Add test case for `asciify` of `\D`.
28 fdcf15088 [troff]: Asciify diverted space nodes as nothing.
29 7f6b57f0e [groff]: Add test case for `asciify` of div `'sp`.
30 feae192ce [troff]: Refactor `asciify` internals. (3/3)
31 b4696db99 [troff]: Refactor `asciify` internals. (2/3)
32 553ff83c8 [troff]: Refactor `asciify` internals. (1/3)
33 df992c999 tmac/doc.tmac: Revise copyright notice.
34 6874aaddc tmac/an.tmac: Revise copyright notice.
35 9d0d854ba [groff]: Ship test artifact in dist archive.
36 897bdec95 [troff]: "Asciify" bracket nodes as nothing.
37 cb4f3a48e [groff]: Add test case for `asciify` of `\b`.
38 7a91d64cc [troff]: Refactor (3/3).
39 9cc5fd03a [troff]: Refactor (2/3).
40 39e5cf5a5 [troff]: Refactor (1/3).
41 63a7aed4c [groff]: Add test case for `asciify` of init `\%`.
42 e1e82c720 [groff]: Add test case for `asciify` of `\?`.
43 bac4a7ab3 [groff]: Add test cases for `asciify` of ^A, ^I.
44 eab9d7638 [groff]: Add test case for `asciify` of `\a`.
45 84a10f2ee [troff]: "Asciify" token nodes as nothing.
46 65353df92 [troff]: Revise source annotations.
47 b99afa24f src/roff/troff/node.cpp: Annotate open question.
48 61facb9f0 [troff]: "Asciify" (plain) space nodes as nothing.
49 c77272d29 [groff]: Add test case for `asciify` of `\:`.
50 c850f3b3c [troff]: Asciify `\~` as space, not ESCAPE_TILDE.
51 f328d20fb [groff]: Add test case for `asciify` of `\~`.
52 cbfd7b403 [troff]: Asciify `\ ` as space, not ESCAPE_SPACE.
53 1b80436f6 [groff]: Add test case for `asciify` of `\ `.
54 40b654215 [troff]: Stop asciifying horiz motions as tabs.
55 d445aee94 src/roff/troff/node.cpp: Add validation checks.
56 961191d3d src/roff/troff/node.cpp: Slightly refactor.
57 fa8cccfaf groff_mm(7): Recast.
58 6ecb5f597 groff_mm(7): Demote "Internals" section to subsec.
59 4643db950 [groff]: Add more `asciify` test cases.
60 70c715140 [groff]: Recast test script progress messages.
61 7723d1f96 ChangeLog: Wrap entries' lines at 72 columns.
62 5661ceeab [gropdf]: Fix.
63 2a5ad85ce [gropdf]: Handle TTF->PFB converted fonts better, and
restore cut'n'paste handling of '\-' mapped to U+2212.
64 7f29f1515 ANNOUNCE: Credit Alexander Monakov, Russ Allbery.
65 d9d48ad97 doc/doc.am: Trivially refactor.
66 e20864ff6 Drop `GROFF_ISC_SYSV3` Autoconf macro.
67 6eeeca1d9 src/roff/troff/node.cpp: Annotate future work.
68 71be7fc14 [troff]: "Asciify" vert motion nodes as nothing.
69 ae7e8fbde src/roff/troff/node.h: Fix code style nit.
70 6038ee68e [troff]: "Asciify" device ext nodes as nothing.
71 c06c87847 [troff]: "Asciify" tag nodes as nothing.
72 a2e7afe9d [troff]: "Asciify" xparent dummy nodes as nothing.
73 33f557ece [troff]: "Asciify" dummy nodes as nothing.
74 159bc16f1 src/roff/troff/node.cpp: Update annotations.
75 56b6f3a82 [groff]: Unit-test `asciify` request.
What remains to be done is to update the documentation of the `asciify`
request to intelligibly explain what it does.
Incidentally, I think these revisions have made unnecessary "pdfclean" and
"sanitize" operations undertaken by some familiar macro programmers
implementing PDF mark support.
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