ox-extra ignore-headlines mismatching/unexpected behavior

[Alexandre Jesus <adbjesus@gmail.com>]

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Hi all,

I am getting some unexpected and/or mismatching (between pdf and html
exports) behavior with ox-extra ignore-headlines. The weird behaviors I
am getting are:

1. When there is an empty line between the ignored headline and the text
   that comes before I would expect there to be a paragraph break in the
   exported file between the text that comes before and after the
   headline. This works as expected for first-level headlines for both pdf
   and html export. However, it does not work for second-level headlines
   when exporting to pdf (but it works as expected for html).

2. When there is an empty line after the ignored headline we do not get
   a paragraph break when exporting to pdf (not even in first-level
   headlines), but there is a break when exporting to html.

3. When there is no empty line around the ignored headline I would
   expect no paragraph break. For pdf export this is true, but for html
   export we get a paragraph break.

I am sending in attachment an example org file and the resulting
pdf/html where we can see these issues.

I've looked into the org-export-ignore-headlines and
org-extra--merge-sections functions to try and understand where the
problem might be. Unfortunately, given that I am somewhat new to elisp
and I am not familiar with the org parse tree I haven't had much luck.
But, if someone can point me to some resources explaining the inner
workings of org I might be able to explore it a bit further if no one
else has the time.

I am using:
- GNU Emacs 26.3 (build 1, x86_64-pc-linux-gnu, GTK+ Version 3.24.20) of
  2020-05-19
- Org mode version 9.3.7 (9.3.7-2-g706970-elpaplus @
  /home/adbjesus/.emacs.d/elpa/org-plus-contrib-20200608/)

Thanks,
Alexandre

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