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Re: [9.4] LOGBOOK visibility

From: Nicolas Goaziou
Subject: Re: [9.4] LOGBOOK visibility
Date: Sat, 04 Jul 2020 10:08:17 +0200
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/26.3 (gnu/linux)


Ihor Radchenko <yantar92@gmail.com> writes:

> There used to be several types of overlays for headline folding, drawer
> folding, and block folding. One of the recent commits made all the
> overlays use headline type. As a result all the overlays are merged into
> a single overlay upon folding. This was done to reduce the total number
> of overlays present in an org buffer, which degrades Emacs performance
> on huge org files (see the discussion in [1]). 
> What you observe is a consequence of that change. Now, all the drawer
> overlays are destroyed when you fold a heading. Isearch would
> only see a single huge overlay and unfold it alltogether.

For completeness, at the beginning drawers and outline shared the same
invisibility value. 

At some point during 9.X development, I gave drawers their own
invisibility value. It provided an overall nicer behaviour, but also
introduced some serious slowdown in large files.

Recently, as pointed out by Ihor, I switched drawers back to their
initial state, i.e., they now share the same invisibility value as the
outline. At least, Org on very large files is slightly more manageable,
but the behaviour is less nice. With overlays, you can't have your cake
and eat it too.

> I am currently working on a patch to rewrite the whole folding system.
> Your issue should disappear once it is applied.

Yes, hopefully, switching to text properties will get us out of this sad

Nicolas Goaziou

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