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BUG: org cycling regression when using the legacy folding style overlays

From: Kaushal Modi
Subject: BUG: org cycling regression when using the legacy folding style overlays
Date: Mon, 30 May 2022 19:04:45 -0400


I was trying to create a minimal reproducible example for a different
issue and I ended up with this other issue that I didn't expect and so
I am reporting that first.

Issue: Opening an Org file gives (wrong-number-of-arguments #<subr
looking-at> 2) error.

Warning (org-element-cache): org-element--cache: Org parser error in
t.org::88. Resetting.
 The error was: (wrong-number-of-arguments #<subr looking-at> 2)
 Please report this to Org mode mailing list (M-x org-submit-bug-report).


1. Clone https://gitlab.com/kaushalmodi/org-mode-mwe to a temp
directory (say, in /tmp)
2. cd to the org repo and check out the main branch. The Org version
used when creating this report was release_9.5.3-520-g4dda0d.
3. emacs -Q -L ./lisp/
/tmp/org-mode-mwe/bug-recipes/collapse-all-post-subtrees/t.org &
4. Evaluate the "code__fold_style" src block in that test file; it
sets the fold style to overlays
5. Evaluate the "code__collapse_all_posts" src block; this code hides
all the subtrees with non-empty values for EXPORT_FILE_NAME or
CUSTOM_ID properties.

If you skip step 4, you will find the collapsing of all subtrees where
EXPORT_FILE_NAME or CUSTOM_ID is set happens as expected in step 5.

But if you evaluate step 4, most (or all?) subtrees remain uncollapsed.
Additionally, once step 4 + 5 are evaluated, the default TAB binding
that should cycle a subtree's visibility also starts behaving

For example, move cursor to line 68 (* Image / Figure) in the test
file t.org after completing all of the above steps.

You will find these lines visible:

* Image / Figure                                                      :image:
** Image links
:EXPORT_FILE_NAME: image-links
:EXPORT_DATE: 2017-07-15T07:49:44-04:00

Hit TAB once, and now you see this: it hid only the title of the
subtree heading under it, but still shows the property drawer

* Image / Figure                                                      :image:
:EXPORT_FILE_NAME: image-links
:EXPORT_DATE: 2017-07-15T07:49:44-04:00

Hit TAB once again, you will see:

* Image / Figure                                                      :image:
** Image links...

Now if you move the point to line 69 (* Image links), hitting the TAB
will not do any kind of cycling at all.

Kaushal Modi

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