[Bug 238583] print/gv: X11 resource "gsCmdConvPDF" is defined specifying nonexistent gs device "pswrite"

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=238583

            Bug ID: 238583
           Summary: print/gv: X11 resource "gsCmdConvPDF" is defined
                    specifying nonexistent gs device "pswrite"
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: Individual Port(s)
          Assignee: ports-bugs at FreeBSD.org
          Reporter: david at catwhisker.org

This is running:
albert(11.3)[1] uname -a
FreeBSD albert.catwhisker.org 11.3-BETA3 FreeBSD 11.3-BETA3 #998 
r348830M/348832: Sun Jun  9 03:47:33 PDT 2019    
root at freebeast.catwhisker.org:/common/S1/obj/usr/src/sys/ALBERT  amd64

with these ports installed:
albert(11.3)[2] pkg info -o gv\* ghostscript\*
gv-3.7.4_5                     print/gv
ghostscript9-agpl-base-9.27_2  print/ghostscript9-agpl-base
ghostscript9-agpl-x11-9.27     print/ghostscript9-agpl-x11

albert(11.3)[3] gs -h | grep 'ps[^ ]*write'
   eplcolor eplmono eps2write eps9high eps9mid epson epsonc escp escpage
   pr1000_4 pr150 pr201 ps2write psdcmyk psdcmyk16 psdcmykog psdrgb psdrgb16
   x11cmyk8 x11gray2 x11gray4 x11mono xcf xes xpswrite

albert(11.3)[4] grep gsCmdConvPDF
/usr/local/{share/gv/gv_system.ad,lib/X11/app-defaults/GV}
/usr/local/share/gv/gv_system.ad:GV.gsCmdConvPDF:       gs -dNOPAUSE -dQUIET
-dBATCH -sDEVICE=pswrite -sOutputFile=%s -f %s -c save pop quit
/usr/local/lib/X11/app-defaults/GV:!GV.gsCmdConvPDF:    gs -dNOPAUSE -dQUIET
-dBATCH -sDEVICE=pswrite -sOutputFile=%s -f %s -c save pop quit

>From file:///usr/local/share/doc/ghostscript/9.27/Devices.htm#PS:
4.2 PS2 writer

The ps2write device outputs postscript language level 2. It is recommnded that
this device is used for PostScript output. There is no longer any support for
creating PostScript level 1 output.

(I reached the above by selecting the "PostScript file output" link from
file:///usr/local/share/doc/ghostscript/9.27/Devices.htm.)

End-user-visible symptoms of the issue:
Attempting to print from gv fails; if the user happens to notice, a message is
emitted (to the controlling tty, if there is one), e.g.:
albert(11.3)[19] gv bike.pdf 
Unknown device: pswrite
lpr: No file in print request.


As a circumvention, I tried placing:
! Fix gv conversion from PDF to PostScript
GV.gsCmdConvPDF:                gs -dNOPAUSE -dQUIET -dBATCH -sDEVICE=ps2write
-sOutputFile=%s -f %s -c save pop quit

in the file where I keep my personal X11-related resources (~/.Xresources),
then running "xrdb -merge ~/.Xresources".  While this no longer generates error
messages, and does print the file, I find that the image is slightly offset and
(as a result) trimmed (since the printer in question is a laser printer, and
has  an "unprintable margin" of about 0.5" or so).  I am not clear on how to
address this.

In passing, I note that "info gv" claims (under "(gv)Resources of gv"):
*gsCmdConvPDF*
     The command used to convert a PDF file to PostScript.

     It defaults to `gs -dNODISPLAY -dQUIET  -dNOPAUSE -sPSFile=%s %s
     -c quit'

I tried specifying that purported default in ~/.Xresources; it also fails.

It is also possible that gv ought not be attempting to "convert to PostScript"
when the invoker wishes to print: apparently generating PostScript has fallen
out of fashion, and folks/applications are expected to only use PDF nowadays.

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