[bug #60222] [ms]: sectioning macros do not reset .IP indentation width

[G. Branden Robinson]

URL:
  <https://savannah.gnu.org/bugs/?60222>

                 Summary: [ms]: sectioning macros do not reset .IP indentation
width
                 Project: GNU troff
            Submitted by: gbranden
            Submitted on: Sat 13 Mar 2021 10:22:22 AM UTC
                Category: Macro - ms
                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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Details:

Paragraphing macros reset it, but sectioning macros don't.  This is a
deviation from other ms implementations (and, I presume, a mistake--my limited
imagination can't imagine a rationale for the present behavior).

Input:

$ cat IP-reset.ms 
.IP \(bu 7n
foobar
.IP \(bu
bazqux
.LP
Garbage.
.IP \(bu
bazqux
.IP \(bu 7n
foobar
.SH
Section
.IP \(bu
bazqux


Heirloom Doctools ms (191015) output:

$ ./bin/nroff -ms ~/src/GIT/groff/EXPERIMENTS/IP-reset.ms | sed '/^$/d'
o      foobar
o      bazqux
Garbage.
o    bazqux
o      foobar
Section
o    bazqux
                       March 13, 2021


V7 Unix ms (via SIMH) output:

$ nroff -ms IP-reset.ms | sed '/^$/d'
+      foobar
+      bazqux
Garbage.
+    bazqux
+      foobar
Section
+    bazqux
                     September 23, 1988


groff git HEAD output:

$ ./build/test-groff -Tutf8 -ms IP-reset.ms | sed '/^$/d'
•      foobar
•      bazqux
Garbage.
•    bazqux
•      foobar
Section
•      bazqux


We also see bug #59826 exhibited here.




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