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From: Ihor Radchenko <yantar92@posteo.net>
To: Eli Zaretskii <eliz@gnu.org>
Cc: iota@whxvd.name, 65734@debbugs.gnu.org, emacs-orgmode@gnu.org
Subject: Re: bug#65734: [BUG] kill-whole-line on folded subtrees [9.6.8 (release_9.6.8-3-g21171d @ /home/w/usr/emacs/0/29/0/lisp/org/)]
Date: Thu, 07 Sep 2023 13:43:57 +0000	[thread overview]
Message-ID: <878r9inlnm.fsf@localhost> (raw)
In-Reply-To: <83il8mz3nf.fsf@gnu.org>

Eli Zaretskii <eliz@gnu.org> writes:

>> We may have a misunderstanding here.
>> In "* Heading text :tag1:tag2:", everything is visible yet Org needs to
>> protect ":tag1:tag2: from being killed by `kill-line', but not from
>> `kill-whole-line'. Moreover, the behaviour also depends on the point
>> position - if point is inside ":tag1:tag2:", we fall back to the default
>> behaviour. And the whole "special" behaviour can also be switched off by
>> flipping `org-special-ctrl-k'.
>> 
>> Invisibility has nothing to do with this need.
>
> Isn't it true that invisibility is what causes the user expectations
> in this case to begin with?  Then saying that "invisibility has
> nothing to do with this" is not really accurate, is it?

There are two things I raised in the previous messages:
1. The specific bug reported, related to invisibility changes in
   after-change-functions
2. A request to extend `kill-whole-line' and `kill-line' to cater Org
   needs:
   - for invisible text in folded headings
   - for visible text, when `kill-line' is called on a heading

In this branch of the discussion, I am describing a request to deal with
visible text.

Hope I made things more clear now.

>> >> What about something like `end-of-visible-line-function'?
>> >
>> > That is also a possibility, but it will then affect kill-line
>> > _anywhere_ in the buffer, whereas a text property can have a more
>> > localized effect.  Are you sure kill-line will need this customization
>> > on the whole buffer?
>> 
>> Applying text property is not free - (1) we need to do it across the
>> whole buffer, which scales poorly; (2) we need to keep it updated as the
>> buffer changes, which scales even worse. In addition, adding more text
>> properties slow down redisplay, which Org already strains to its limits.
>
> I understand, but in my book correctness tramps performance, and I was
> trying to make the point that perhaps modifying the behavior of
> kill-line everywhere in Org buffers might be incorrect for some cases.

I think that `end-of-visible-line-function' might be more appropriate -
it does not reduce correctness (we can simply fall back to the default
behaviour when needed) and less problematic performance-wise, as I
described.

Or maybe some other idea. But not text properties - they are
problematic performance-wise. In addition, `org-kill-line' is sensitive
to point position (do different things at bol, before ":tag:...", and
inside it). I am not sure how to make things depend on point position
with text properties only.

-- 
Ihor Radchenko // yantar92,
Org mode contributor,
Learn more about Org mode at <https://orgmode.org/>.
Support Org development at <https://liberapay.com/org-mode>,
or support my work at <https://liberapay.com/yantar92>


  parent reply	other threads:[~2023-09-07 13:44 UTC|newest]

Thread overview: 53+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2023-09-04 16:30 [BUG] kill-whole-line on folded subtrees [9.6.8 (release_9.6.8-3-g21171d @ /home/w/usr/emacs/0/29/0/lisp/org/)] Sebastian Miele
2023-09-05 10:29 ` Ihor Radchenko
2023-09-05 11:54   ` bug#65734: " Eli Zaretskii
2023-09-05 15:25     ` Sebastian Miele
2023-09-05 15:50       ` Eli Zaretskii
2023-09-06  8:23         ` Ihor Radchenko
2023-09-06 12:16           ` Eli Zaretskii
2023-09-06 13:30             ` Sebastian Miele
2023-09-07 13:49               ` Ihor Radchenko
2023-09-06  8:30     ` Ihor Radchenko
2023-09-06 12:20       ` Eli Zaretskii
2023-09-07 10:00         ` Ihor Radchenko
2023-09-07 10:19           ` Eli Zaretskii
2023-09-07 10:27             ` Sebastian Miele
2023-09-07 13:43             ` Ihor Radchenko [this message]
2023-09-06 15:04       ` Sebastian Miele
2023-09-07 10:03         ` Ihor Radchenko
2023-09-05 14:30   ` Max Nikulin
2023-09-05 15:42     ` Eli Zaretskii
2023-09-05 15:50       ` Ihor Radchenko
2023-09-05 16:02         ` Max Nikulin
2023-09-05 16:12           ` Ihor Radchenko
2023-09-05 16:14         ` Eli Zaretskii
2024-01-07 16:27         ` Stefan Monnier
2024-01-08 12:15           ` Ihor Radchenko
2024-01-08 15:33             ` Stefan Monnier
2024-01-09 14:52               ` Ihor Radchenko
2024-01-09 16:48                 ` Stefan Monnier
2024-01-09 22:21                   ` Ihor Radchenko
2024-01-09 15:47             ` Ihor Radchenko
2024-01-09 16:01               ` Stefan Monnier
2024-01-09 22:33                 ` Ihor Radchenko
2024-01-10  3:08                   ` Stefan Monnier
2024-01-10 12:52                   ` Eli Zaretskii
2024-01-10 13:05                     ` Ihor Radchenko
2024-01-10 13:55                       ` Eli Zaretskii
2024-01-11 15:50                         ` Ihor Radchenko
2024-01-11 16:05                           ` Eli Zaretskii
2024-01-11 16:15                             ` Ihor Radchenko
2024-01-11 16:44                               ` Eli Zaretskii
2024-01-11 18:08                                 ` Ihor Radchenko
2024-01-11 19:19                                   ` Eli Zaretskii
2024-01-12 12:24                                     ` Ihor Radchenko
2024-01-12 12:32                                       ` Eli Zaretskii
2024-01-12 12:39                                         ` Ihor Radchenko
2024-01-12 14:03                                           ` Eli Zaretskii
2024-01-12 14:15                                             ` Ihor Radchenko
2024-01-12 21:09                                   ` Stefan Monnier
2024-01-12 21:16                                     ` Ihor Radchenko
2024-01-10 16:26                       ` Stefan Monnier
2024-01-10 16:39                         ` Eli Zaretskii
2024-01-11 15:44                         ` Ihor Radchenko
2024-01-09 15:50 ` Ihor Radchenko

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