Re: Incorrect link is stored (org-elements?)

[Ihor Radchenko <yantar92@gmail.com>]

Max Nikulin <manikulin@gmail.com> writes:

> With equivalent patch (attached one has additional differences in spaces 
> around) my particular case works. I have no idea which additional 
> scenarios it may affect. I did not test the patch extensively. I faced 
> the issue while I was preparing a patch to fix storing double #CUSTOM_ID 
> links.

I pushed the patch upstream.

> P.S. I am puzzled that `org-element-at-point' returns paragraph even 
> when patch is not applied. After such call `org-store-link' does what I 
> expect. However "after undo" erroneous state survives emacs restart, 
> thanks to org-persist, I believe.

The bug was in very specific case. org-element-at-point now has a
special fast mode of operation when CACHED-ONLY argument is non-nil. In
this mode, it does not try to parse anything, but only checks the
nearest cached element and returns it if point is at the element
beginning, within +begin/end line of the element, or inside a
non-greater element. The error happened when the cached element was a
section and point was within blank lines at the end of the section
exactly one symbol before the following headline. In such cases,
org-element-at-point must follow some special rules (see comments in
org-element--parse-to), but it did not in this specific scenario.
On top of that, org-element-parse-to cannot return section and the
current code assumes that we ever attempt to return section when point
is at the beginning of section. So, it returns
(org-element-at-point (1+ pos)) instead. Hence, the next headline
was wrongly returned when (1) point is 1- beginning of next headline
(2) we are within blank lines at the end of section (3) some edit in
buffer just cleared everything in cache inside current section
(4) org-element-at-point is called with non-nil CACHED-ONLY argument.

Just calling org-element-at-point did not trigger error. You would need
to call (org-element-at-point nil 'cached)

Best,
Ihor