URL:
<https://savannah.gnu.org/bugs/?64285>
Summary: [troff] \D't' (set line thickness) drawing command
alters drawing position
Group: GNU roff
Submitter: gbranden
Submitted: Thu 08 Jun 2023 10:43:26 PM UTC
Category: Core
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 08 Jun 2023 10:43:26 PM UTC By: G. Branden Robinson <gbranden>
Steve Izma [reported
https://lists.gnu.org/archive/html/groff/2023-06/msg00055.html]:
Is it worth pointing out here that \D't n' is not zero-width?
e.g.:
.sp 1i
.po 1i
.ps 12s
.ll 24P
\D'l \n[.l]u 0'
.br
\D't .5p'\D'l \n[.l]u 0'
.br
In fill mode, the second drawing command produces this error:
troff: thick:7: warning [p 1, 1.2i]: can't break line
The troff output:
x T ps
x res 72000 1 1
x init
p1
V84000
H72000
md
DFd
s12000
Dl 288000 0
n12000 0
V96000
H72000
Dt 500 0
Dl 288000 0
n12000 0
x trailer
V792000
x stop
shows that \D't .5p' has a width of 500 units, which is output as
a 500-unit space. For as long as I can remember, I've needed to
use this instead:
\Z'\D't .5p''\D'l \n[.l]u 0'
I'm pretty sure this anomaly has been discussed on the groff list
before, but I don't know of any explanation in the documentation.
As noted in the follow-up, I regressed notice of this in the documentation
(which didn't really treat it as a bug), and within 2 days Steve stumbled
across this issue.
But like "STUPID_DRAWING_POSITIONING" in the source code, it is a bug and we
should fix it.
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