Re: NR pdf is larger with current git by 15%

[Masamichi Hosoda]

> Ghostscript seems to need `-sDEVICE=pdfwrite` to produce the PDF we expect.
> 
> Is the device specifying way on the new method (without `-sDEVICE=pdfwrite`)
> documented by Ghostscript documents?
> If not, it is not a bug in my humble opinion.

I've found the documented way to specify Ghostscript devices
without `-sDEVICE=pdfwrite`.
It is using the operator `selectdevice`.

https://www.ghostscript.com/doc/9.52/Use.htm#Output_device
https://www.ghostscript.com/doc/9.26/Use.htm#Output_device

Here is my experiment.

```
$ echo "mark /OutputFile (foo.new-documented.pdf) /PageSize [595.28 841.89] 
(pdfwrite) finddevice putdeviceprops setdevice (pdfwrite) selectdevice newpath 
fill (foo.ps) run" > gs-command-documented.ps

$ gs -dNODISPLAY -dNOSAFER -dNOPAUSE -dBATCH -dAutoRotatePages=/None 
-dPrinted=false gs-command-documented.ps
...snip...

$ qpdf --qdf foo.new-documented.pdf foo.new-documented.qdf

$ diff -u foo.old-method.qdf foo.new-documented.qdf > old-to-documented.diff

$
```

As a result, the drawing operators in PDF are the same as the old method.