org-appear--post-cmd: wrong-type-argument on Emacs 29

[alopezrivera]

Hi! First of all thank you for the awesome package. I've run into a bug I can't figure out with org-appear (as well as with a very similar one with org-fragtog, see https://github.com/io12/org-fragtog/issues/47) on Emacs 29.

Describe the bug org-fragtog-mode seems to not work on Emacs 29.

To Reproduce Steps to reproduce the behavior:

1. Open org file
2. M-x org-appear-mode
3. The following error message is shown:

   Error in post-command-hook (org-appear--post-cmd): (wrong-type-argument number-or-marker-p nil)

The bug happens within org-appear--current-elem. Bug trace:

Debugger entered--Lisp error: (wrong-type-argument number-or-marker-p nil)
  org-appear--current-elem()
  org-appear--post-cmd()
  eval((org-appear--post-cmd) t)
  eval-expression((org-appear--post-cmd) nil nil 127)
  funcall-interactively(eval-expression (org-appear--post-cmd) nil nil 127)
  call-interactively(eval-expression nil nil)
  command-execute(eval-expression)

Expected behavior org-fragtog-mode starts and inline toggling of links etc.

Videos Can provide if needed.

Version and environment

• OS: Windows Subsystem for Linux (WSL) with Ubuntu 22.04
• Emacs version: GNU Emacs 29.0.50 (build 1, x86_64-pc-linux-gnu, GTK+ Version 3.24.33, cairo version 1.16.0) of 2022-07-12

Additional context Can provide if needed.

[alopezrivera]

The root of the issue was the version of Org it turns out!

See here: https://github.com/io12/org-fragtog/issues/47

[ispringle]

The root of the issue was the version of Org it turns out!

See here: io12/org-fragtog#47

I do not believe this is accurate. The root of the issue is something org introduced, by rolling back you've returned to a version prior to the change, but will still be a problem.

I too am having this issue. I think this should be re-opened so @awth13 can be made aware of breaking changes in a new release of org.

EDIT:

Strike that. I am on Org mode version 9.7-pre (9.7-pre-n/a-g5496f5) and I am no longer having any issues with org-appear. I deleted the cache for straight and reinstalled org and it started working. I suspect there was an upstream change that's been made since then. Should be safe to use the standard org version straight.el provides -- or as safe as using the most recently cut version can be!