[bug #62044] [mandoc] combined with 'pdf' device can throw off line adjustment

[G. Branden Robinson]

URL:
  <https://savannah.gnu.org/bugs/?62044>

                 Summary: [mandoc] combined with 'pdf' device can throw off
line adjustment
                 Project: GNU troff
            Submitted by: gbranden
            Submitted on: Sun 13 Feb 2022 06:42:23 AM UTC
                Category: Macro - others/general
                Severity: 3 - Normal
              Item Group: Rendering/Cosmetics
                  Status: None
                 Privacy: Public
             Assigned to: None
             Open/Closed: Open
         Discussion Lock: Any
         Planned Release: None

    _______________________________________________________

Details:

This is a somewhat subtle issue.

Line adjustment of output text gets changed for the same input document IF I
use the 'pdf' output device ('ps' doesn't exhibit it) and only IF I use the
'mandoc' man page wrapper.  That latter factor makes it harder for me to blame
the new PDF bookmarking feature or any of the stuff in an-ext.tmac.

Furthermore, this is reproducible when rendering only a single page.

The results are evident in the Authors section of our groff_man(7) page.

I wanted to blame this on mandoc.tmac somehow managing to switch the line
adjustment "parity" (see bug #57836), but the fact that a break occurs in a
different place suggests to me that it's not as simple as that.

Screenshots attached.

Here are input commands and a diff of the troff device-independent output.  It
looks lengthy but it affects only a small part of the document--just that
"Authors" section, in fact.


$ alias tg
alias tg='./build/test-groff -b -ww'
$ tg -Z -t -ww -b -Tpdf -man ./build/tmac/groff_man.7 >| angle2.man.grout
$ tg -Z -t -ww -b -Tpdf -mandoc ./build/tmac/groff_man.7 >|
angle2.mandoc.grout
$ diff -u angle2.man*grout
--- angle2.man.grout    2022-02-13 17:33:35.652212655 +1100
+++ angle2.mandoc.grout 2022-02-13 17:33:44.420233214 +1100
@@ -15460,33 +15460,33 @@
 V686400
 H108000
 tM.
-wh4695
+wh4174
 tDouglas
-wh4695
+wh4174
 tMcIlro
-H189780
+H188738
 ty
 wx font 11 S
 f11
-h4695
+h4174
 Cla
 f5
 h3290
 tm.douglas.mcilro
-H272665
+H271102
 ty@dartmouth.edu
 f11
 Cra
-wf5
-h7985
+wwf5
+h11636
 tdesigned,
-wh4695
+wh4173
 timplemented,
-wh4695
+wh4173
 tand
-wh4695
+wh4173
 tdocumented
-wh4695
+wh4173
 tthe
 n12000 0
 V698400
@@ -15678,62 +15678,62 @@
 tre
 H115620
 tgisters.
-wh5222
+wh5051
 tW
-H158092
+H157921
 terner
-wh2722
+wh2551
 tLember
-H212274
+H211932
 tg
 wx font 11 S
 f11
-h2722
+h2552
 Cla
 f5
 h3290
 twl@gnu.or
-H268146
+H267634
 tg
 f11
 Cra
-wf5
-h6012
+wwf5
+h8394
 tsupplied
-wh2722
+wh2552
 tthe
 wx font 36 TB
 f36
-h2722
+h2552
 tS
 wf5
-h2722
+h2552
 tand
 wf36
-h2722
+h2552
 tcR
 wf5
-h2722
+h2552
 tre
-H378158
+H379178
 tgisters,
-wh2722
+wh2552
 tand
-wh2722
+wh2552
 te
-H430942
+H431622
 txposed
-wh2722
+wh2552
 tthe
 wf36
-h2722
+h2552
 tLL
 wf5
-h2722
+h2552
 tre
-H500618
+H500788
 tgister
-wh2722
+wh2552
 t(in
 Chy
 h3330
@@ -15741,57 +15741,57 @@
 V96000
 H108000
 tternal
-wh3330
+wh3122
 tto
-wh3330
+wh3122
 tSe
-H154960
+H154544
 tv
-H159810
+H159394
 tenth
-wh3330
+wh3122
 tEdition
-wh3330
+wh3122
 tUnix
 wf38
-h3710
+h3501
 tman
 f5
 h240
 t)
-wh3329
+wh3121
 tto
-wh3329
+wh3121
 tthe
-wh3329
+wh3121
 tuser
-wh3329
+wh3121
 tinterf
-H329176
+H327303
 tace.
-wh5829
+wh5621
 tLarry
-wh3329
+wh3121
 tK
-H383234
+H380945
 tollar
 wf11
-h3329
+h3121
 Cla
 f5
 h3290
 tk
-H413083
+H410586
 tollar@alltel.net
 f11
 Cra
-wf5
-h6619
+wwf5
+h9532
 tadded
-wh3329
+wh3121
 tthe
 wf36
-h3329
+h3121
 tFT
 f5
 t,
@@ -15864,42 +15864,42 @@
 V120000
 H108000
 tenth
-wh3025
+wh2792
 tEdition
-wh3025
+wh2792
 tUnix
 wf38
-h3404
+h3172
 tman
 f5
 h240
 t)
-wh3024
+wh2792
 tto
-wh3024
+wh2792
 tthe
-wh3024
+wh2792
 tuser
-wh3024
+wh2792
 tinterf
-H275230
+H273604
 tace.
-wh5524
+wh5291
 tG.
-wh3024
+wh2791
 tBranden
-wh3024
+wh2791
 tRobinson
 wf11
-h3024
+h2791
 Cla
 f5
 h3290
 tg.branden.robinson@gmail.com
 f11
 Cra
-wf5
-h6314
+wwf5
+h8872
 tim
 Chy
 h3330
@@ -15995,7 +15995,7 @@
 f5
 h3290
 t,
-wh2500
+wwh5000
 tand
 wh2500
 tRobinson.
@@ -16048,39 +16048,39 @@
 f5
 h3290
 t.
-wh5930
+wwh8904
 tIt
-wh3430
+wh3202
 tw
-H178690
+H181436
 tas
-wh3430
+wh3202
 tcorrected
-wh3430
+wh3202
 tand
-wh3431
+wh3202
 tupdated
-wh3431
+wh3202
 tby
-wh3431
+wh3202
 tLember
-H328393
+H329996
 tg
-wh3431
+wh3202
 tand
-wh3431
+wh3202
 tRobinson.
-wh5931
+wh5702
 tThe
-wh3431
+wh3202
 te
-H424737
+H425424
 txtension
-wh3431
+wh3202
 tmacros
-wh3431
+wh3202
 twere
-wh3431
+wh3202
 tdocu
 Chy
 h3330




    _______________________________________________________

File Attachments:


-------------------------------------------------------
Date: Sun 13 Feb 2022 06:42:23 AM UTC  Name: groff_man_7_authors.man.good.png 
Size: 154KiB   By: gbranden

<http://savannah.gnu.org/bugs/download.php?file_id=52848>
-------------------------------------------------------
Date: Sun 13 Feb 2022 06:42:23 AM UTC  Name:
groff_man_7_authors.mandoc.bad.png  Size: 153KiB   By: gbranden

<http://savannah.gnu.org/bugs/download.php?file_id=52849>

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