URL:
<https://savannah.gnu.org/bugs/?64005>
Summary: [ms] fix for Savannah #62688 suppresses page breaks
between displays
Group: GNU roff
Submitter: gbranden
Submitted: Wed 05 Apr 2023 11:02:47 PM UTC
Category: Macro ms
Severity: 3 - Normal
Item Group: Incorrect behaviour
Status: Confirmed
Privacy: Public
Assigned to: gbranden
Open/Closed: Open
Discussion Lock: Any
Planned Release: None
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Follow-up Comments:
-------------------------------------------------------
Date: Wed 05 Apr 2023 11:02:47 PM UTC By: G. Branden Robinson <gbranden>
The fix for bug #62688, to get more authentic-to-AT&T-ms spacing between
displays, unfortunately also defeats user-requested page breaks between
displays.
This was [https://lists.gnu.org/archive/html/groff/2023-04/msg00022.html
reported by Michał Kruszewski to the groff development list].
Here is some sample input.
.LP
Hello.
This is page \n%.
.DS
display goes here
.DE
.bp
.LP
This is page \n%.
.pl \n(nlu
All of groff 1.22.4 ms, DWB 3.3 ms, Heirloom Doctools ms, and Version 7 Unix
ms honor the page break. groff Git does not.
I had implemented the fix by simply kicking the formatter into no-space mode
after displays and equations. It was the simplest solution I could think of.
Unfortunately, it was too simple.
Come up with something better, and add a regression test.
An only slightly less simple remedy might be to wrap the `bp` request, forcing
no-space on, invoking the "real" `bp`, and then restoring no-space mode (if it
was enabled).
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