[bug #64336] [mm] loses long floating display

[G. Branden Robinson]

URL:
  <https://savannah.gnu.org/bugs/?64336>

                 Summary: [mm] loses long floating display
                   Group: GNU roff
               Submitter: gbranden
               Submitted: Thu 22 Jun 2023 08:18:42 AM UTC
                Category: Macro mm
                Severity: 3 - Normal
              Item Group: Incorrect behaviour
                  Status: Confirmed
                 Privacy: Public
             Assigned to: None
             Open/Closed: Open
         Discussion Lock: Any
         Planned Release: None


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Follow-up Comments:


-------------------------------------------------------
Date: Thu 22 Jun 2023 08:18:42 AM UTC By: G. Branden Robinson <gbranden>
We have a 3-way incompatibility between DWB, Heirloom, and groff mm.

Input:


$ cat DF-no-flush-bug.mm
.P
The modern conservative is engaged in one of man's oldest exercises in
moral philosophy;
that is,
the search for a superior moral justification for selfishness.
.br
\(em J.\& K.\& Galbraith
.\" This display is exactly long enough to float past the next paragraph
.\" on DWB 3.3 nroff/mm.  Heirloom Doctools loses the display entirely,
.\" no matter what its length.
.DF
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
This is my display.
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
.\" With 3 more lines, groff 1.22.4 mm loses it, too.
.if \n(.g \{\
46
47
48
.\}
.DE
.P
Goodbye,
cruel world!


Output:


$ DWBHOME=. ./bin/nroff -mm DF-no-flush-bug.mm | cat -s

                                  - 1 -

       The modern conservative is engaged in one of man's oldest
       exercises in moral philosophy; that is, the search for a
       superior moral justification for selfishness.
       - J. K. Galbraith

       Goodbye, cruel world!

                                  - 2 -

       1
       2
       3
       4
       5
       6
       7
       8
       9
       10
       11
       12
       13
       14
       15
       16
       17
       18
       19
       20
       21
       22
       23
       24
       25
       26
       27
       28
       29
       30
       This is my display.
       31
       32
       33
       34
       35
       36
       37
       38
       39
       40
       41
       42
       43
       44
       45

[cd heirloom]
$ ./bin/nroff -mm DF-no-flush-bug.mm | cat -s

                                  - 1 -

       The modern conservative is engaged in one of man's oldest
       exercises in moral philosophy; that is, the search for a
       superior moral justification for selfishness.
       -- J. K. Galbraith

       Goodbye, cruel world!

$ nroff -mm DF-no-flush-bug.mm | cat -s

                                   ‐ 1 ‐

       The  modern  conservative  is engaged in one of man’s oldest
       exercises in moral philosophy; that is,  the  search  for  a
       superior moral justification for selfishness.
       — J. K. Galbraith

       Goodbye, cruel world!










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