Re: [BUG] When calling org-tree-to-indirect-buffer: (wrong-type-argument listp org-fold-outline) in org-fold-core-get-folding-spec-from-alias [9.6.6 (release_9.6.6 @ /gnu/store/c7vqk20kf6zw73klr8bacnh0gqahk5dd-emacs-29.1-29.1/share/emacs/29.1/lisp/org/)]

[Adam Porter]

Hi Ihor,

On 8/25/23 03:19, Ihor Radchenko wrote:

> > Debugger entered--Lisp error: (wrong-type-argument listp org-fold-outline)
> >    car(org-fold-outline)
> >    alist-get(org-fold-outline ((:alias . org-link) (org-link . org-link) 
> > (:alias . org-link-description) (org-link-description . org-link-description) 
> > (property-drawer . org-fold-drawer) (drawer . org-fold-drawer) (:alias . 
> > org-fold-drawer) (org-fold-drawer . org-fold-drawer) (verse-block . 
> > org-fold-block) (src-block . org-fold-block) (special-block . org-fold-block) 
> > (quote-block . org-fold-block) (export-block . org-fold-block) (example-block . 
> > org-fold-block) (dynamic-block . org-fold-block) (comment-block . 
> > org-fold-block) (center-block . org-fold-block) (block . org-fold-block) 
> > (:alias . org-fold-block) (org-fold-block . org-fold-block) (plain-list . 
> > org-fold-outline) (inlinetask . org-fold-outline) (outline . org-fold-outline) 
> > (heading . org-fold-outline) (headline . org-fold-outline) (:alias . 
> > org-fold-outline) (org-fold-outline . org-fold-outline)))
> >    org-fold-core-get-folding-spec-from-alias(org-fold-outline)
> >    org-fold-core--property-symbol-get-create(org-fold-outline)
>
> This is a very strange backtrace.
> When I run that `alist-get' call manually, there is no error. And
> `alist-get' does not call `car'.
>
> May you try to re-generate the backtrace again?

It is indeed strange.  I generated the backtrace several times over 
several sessions before reporting.  I also can reproduce it in a clean 
Emacs configuration like so:

Using with-emacs.sh on Emacs 29.1:

1.  Run "with-emacs.sh -i burly"
2.  "C-x C-f /tmp/test.org RET"
3.  Input a file like so:

  * Heading A
  ** Heading A1

4.  With point on Heading A1, "C-c C-x b".
5.  "M-x delete-other-windows RET" to show only the subtree buffer.
6.  "M-x burly-bookmark-windows RET", input name, save bookmark.
7.  Kill the file's buffer and delete-other-windows.
8.  "C-x r b" select bookmark that was created, and open it.
9.  You should get the error, and with debug-on-error, the backtrace.

This bug breaks burly's functionality to bookmark and restore subtree 
buffers, which worked fine before upgrading to Emacs 29.1.

Thanks,
Adam