Re: [Patch] to correctly sort the items with emphasis marks in a list

[Juan Manuel Macías]

Hi Maxim,

Maxim Nikulin writes:

> On 10/04/2021 07:01, Juan Manuel Macías wrote:
>> Nicolas Goaziou writes:
>>> Could you apply the same fix to the `org-verbatim-re' match above, and
>>> provide an appropriate commit message?
>> Done! I've attached the corrected patch. Sorry for the flaws in me
>> previous patch: I'm a bit of a novice at submitting patches...
>
> I have not read yet the following documents to realize what pitfalls
> could be expected due to significant space added to Spanish and Polish 
> collation rules in libc.
>
> http://www.unicode.org/reports/tr10/
> Unicode® Technical Standard #10
> Unicode Collation Algorithm
>
> http://www.unicode.org/reports/tr35/tr35-collation.html#CLDR_Collation_Algorithm
> Unicode Technical Standard #35
> Unicode Locale Data Markup Language (LDML)
> Part 5: Collation
>
> In the meanwhile I have realized that org-sort-remove-invisible
> function has rather strange behavior. There are no tests, so I am in
> doubt if the following result is expected and intended (unpatched
> version)

All this research you've done on spaces and collation rules is very
interesting and enlightening.

Certainly, space is important, as the following list in Spanish is
correctly ordered as:

- lo raro
- lo vano
- localidad

However, with the 'unpatched' version of org-sort-remove invisible I get
this result (which is correct) for this list:

- lo bueno
- lo /bueno/
- lo vano
- lo /vano/

And with the patched version, I get this, which is wrong (!):

- lo bueno
- lo vano
- lo /bueno/
- lo /vano/

It seems that what I was proposing as a patch at the beginning is not,
finally, a viable solution for all contexts...

The problem is that, if the first space is removed, we get this
abnormal result:

#+begin_src emacs-lisp
(org-sort-remove-invisible "- lo /bueno/")
#+end_src

#+RESULTS:
: - lobueno

Best regards,

Juan Manuel