Re: [Orgmode] Feature request: navigate history of folding views

[Carsten Dominik]

On Sep 3, 2007, at 19:23, William Henney wrote:

> I missed this comment of Eddward's initially because I was on 
> holiday...
>
> On 7/11/07, Eddward DeVilla <address@hidden> wrote:
> > For my uses, what I would love is a way to have org-mode remember how
> > a subtree was folded so I could hide a subtree and then reopen it
> > later with all of it children exposed or hidden as they were before.
> > I like to use hiding for context in a project, but I get by without
> > it.
>
> This is similar to something that I have often wished for: some sort
> of history mechanism for the expose/hide states of a buffer. The ideal
> interface would simply be for "C-_" (undo) to work on the folding
> views. Is this at all feasible?

Not easily.  outline-mode uses overlays to hide parts of the buffer,
and overlay changes don't make it into the undo list.  Text property
changes would be undoable.

I guess storing the hiding state in some way is in principle
possible but a lot of work.  More-over, it would be hard to write
it in a way that it would this smoothly integrate into the normal
work flow.

- Carsten