bug#41613: 26.1; ps-paper-type does not change page size

["Marvin Gülker" <post+ebugs@guelker.eu>]

Dear Maintainers,

setting the `ps-paper-type' variable and then calling 
`ps-print-buffer-with-faces' does not have an effect on the paper size 
of the page at all. It only affects the region in which the text drawn 
onto a standard-sized paper. For instance, if `ps-paper-size' is set to 
`diskette' (which is very small) the drawing area is confined to a very 
little region on the bottom-left of a full-size A4 paper sheet. I would 
have expected that setting `ps-paper-size' changes the actual paper 
size, not the drawing region, so that the resulting PS file has the 
dimensions of (in this example) `diskette'.

To reproduce, create a file with several paragraphs of arbitrary text so 
it does not fit on one page of the chosen size. Then, start Emacs with 
emacs -Q and do the following:

1. Visit said file.
2. M-x set-variable ps-paper-type diskette
3. M-x set-variable ps-print-header nil ;; without this an error occurs
4. C-u M-x ps-print-buffer-with-faces result.ps

Open the resulting PS file with ghostscript or convert it to PDF with 
ps2pdf. The text is drawn onto a very small region on the bottom-left of 
an A4 paper sheet. Instead, it should have been a very small page entirely.


In GNU Emacs 26.1 (build 2, x86_64-pc-linux-gnu, GTK+ Version 3.24.5)
 of 2019-09-23, modified by Debian built on x86-grnet-01
Windowing system distributor 'The X.Org Foundation', version 11.0.12004000
System Description:	Debian GNU/Linux 10 (buster)

Recent messages:
For information about GNU Emacs and the GNU system, type C-h C-a.
Loading ps-print...done
Formatting...  0%
Collecting face information...
Formatting...done
Saving...
Wrote /tmp/lorem.txt.ps [2 times]
You can run the command ‘ps-print-buffer-with-faces’ with M-x -p-b-w RET
Wrote /tmp/lorem.txt.ps

Configured using:
 'configure --build x86_64-linux-gnu --prefix=/usr
 --sharedstatedir=/var/lib --libexecdir=/usr/lib
 --localstatedir=/var/lib --infodir=/usr/share/info
 --mandir=/usr/share/man --enable-libsystemd --with-pop=yes
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ACL LIBSELINUX GNUTLS LIBXML2 FREETYPE M17N_FLT LIBOTF XFT ZLIB
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Important settings:
  value of $LANG: de_DE.UTF-8
  locale-coding-system: utf-8-unix

Major mode: Text

Minor modes in effect:
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Load-path shadows:
None found.

Features:
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Memory information:
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