bug#65055: 30.0.50; save-place-abbreviation-file-names :set fails for saveplace-pdf-view places

[Visuwesh]

saveplace-pdf-view package [1] uses a custom "place" format to save and
restore the last position for PDF files viewed via doc-view package.

One such "place" is

    ("/home/viz/tmp/piron1976.pdf"
      (pdf-view-bookmark "piron1976.pdf"
                 (filename . "~/tmp/piron1976.pdf")
                 (position . 1)
                 (last-modified 25805 5369 546130 641000)
                 (page . 2)
                 (slice)
                 (size . fit-width)
                 (origin)
                 (handler . pdf-view-bookmark-jump-handler)))

This fails with the following backtrace because 
(cdr (pdf-view-bookmark ...) is a list,

Debugger entered--Lisp error: (wrong-type-argument stringp ("piron1976.pdf" 
(filename . "~/tmp/piron1976.pdf") (position . 1) (last-modified 25805 5369 
546130 641000) (page . 2) (slice) (size . fit-width) (origin) (handler . 
pdf-view-bookmark-jump-handler)))
  expand-file-name(("piron1976.pdf" (filename . "~/tmp/piron1976.pdf") 
(position . 1) (last-modified 25805 5369 546130 641000) (page . 2) (slice) 
(size . fit-width) (origin) (handler . pdf-view-bookmark-jump-handler)))
  #f(compiled-function (sym val) #<bytecode 
0x44095c5cb302811>)(save-place-abbreviate-file-names nil)
  custom-initialize-reset(save-place-abbreviate-file-names (funcall 
#'#f(compiled-function () #<bytecode 0x19800016fe914>)))
  custom-declare-variable(save-place-abbreviate-file-names (funcall 
#'#f(compiled-function () #<bytecode 0x19800016fe914>)) "If non-nil, abbreviate 
file names before saving th..." :type boolean :set #f(compiled-function (sym 
val) #<bytecode 0x44095c5cb302811>) :version "28.1")
  
byte-code("\300\301\302\303\304DD\305\306\307\310\311\312\313&\11\210\300\314\302\303\315DD\316\306\307%\210\300\317\302\303\320DD\321\306\322%\210\300\323\302\303\324DD\325\312..."
 [custom-declare-variable save-place-abbreviate-file-names funcall function 
#f(compiled-function () #<bytecode 0x19800016fe914>) "If non-nil, abbreviate 
file names before saving th..." :type boolean :set #f(compiled-function (sym 
val) #<bytecode 0x44095c5cb302811>) :version "28.1" save-place-save-skipped 
#f(compiled-function () #<bytecode 0x19800016fe5d4>) "If non-nil, remember 
files matching `save-place-sk..." save-place-skip-check-regexp 
#f(compiled-function () #<bytecode -0x7810fef85890ea4>) "Regexp whose file 
names shall not be checked for r..." regexp save-place-ignore-files-regexp 
#f(compiled-function () #<bytecode -0x6b951d2e7268727>) "Regexp matching files 
for which no position should..." "24.1"] 10)
  require(saveplace)
  eval-buffer(#<buffer  *load*> nil 
"/home/viz/lib/emacs/straight/build/saveplace-pdf-v..." nil t)  ; Reading at 
buffer position 1694
  
load-with-code-conversion("/home/viz/lib/emacs/straight/build/saveplace-pdf-v..."
 "/home/viz/lib/emacs/straight/build/saveplace-pdf-v..." nil t)
  require(saveplace-pdf-view)
  (progn (require 'saveplace-pdf-view))
  eval((progn (require 'saveplace-pdf-view)) t)
  elisp--eval-last-sexp(nil)
  eval-last-sexp(nil)
  (eros--eval-overlay (eval-last-sexp eval-last-sexp-arg-internal) (point))
  eros-eval-last-sexp(nil)
  funcall-interactively(eros-eval-last-sexp nil)
  call-interactively(eros-eval-last-sexp nil nil)
  command-execute(eros-eval-last-sexp)

Checking if the cdr of that list is a string before calling
expand-file-name/abbreviate-file-name fixes the issue for me.

Will attach patch once bug number is generated.

1. https://github.com/nicolaisingh/saveplace-pdf-view


In GNU Emacs 30.0.50 (build 3, x86_64-pc-linux-gnu, X toolkit, Xaw
 scroll bars) of 2023-08-04 built on astatine
Repository revision: 60e5f212182ca2f41f89a4315075e38433bc8ac0
Repository branch: master
Windowing system distributor 'The X.Org Foundation', version 11.0.12101007
System Description: Debian GNU/Linux trixie/sid

Configured using:
 'configure --with-sound=alsa --with-x-toolkit=lucid --with-json
 --without-xaw3d --without-gconf --without-libsystemd --without-cairo'
Configured features:
ACL DBUS FREETYPE GIF GLIB GMP GNUTLS GPM GSETTINGS HARFBUZZ JPEG JSON
LIBOTF LIBSELINUX LIBXML2 MODULES NOTIFY INOTIFY PDUMPER PNG RSVG
SECCOMP SOUND SQLITE3 THREADS TIFF TOOLKIT_SCROLL_BARS WEBP X11 XDBE XFT
XIM XINPUT2 XPM LUCID ZLIB
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Major mode: Ement-Room:Not-syncing

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Load-path shadows:
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