Is there a save-outline-visibility excursion or so?

[Thorsten Jolitz]

Hi List, 

I wonder if there is something like a 'save-excursion' for outline
visibility around? A kind of 'save-outline-visibility' function/macro
that would enable to change visibility state of an outlined buffer, do
some actions that depend on that visibility state in a program, and go
back to that exact state of folded and unfolded subtrees afterwards. 

I'm not talking about global visibility cycling, more about something
similar to what window managers do - go from one complicated visibility
state to another (maybe simple) state (like show-all or hide-all), but
be able to go back to that complicated state with exactly the same
subtrees folded or unfolded like before. 

-- 
cheers,
Thorsten