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In my org file, I have a lot of headlines that I'd like to keep folded most of the time - and some that I want expanded, but the state of each expanded headline is lost when I close emacs.

Is there a way to restore the state upon re-opening the file?

PS: I'm not looking for the default expansion state as in Keep the headlines expanded in Org-Mode, nor I want to set the default visibility of each headline manually through properties - I want to remember the state of the whole file, heterogenous as it may be.

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    There is not a way to do this that exists in org-mode. You would have to save the state to a file, setup some file variables to reload the state when the org file is opened, and probably a hook function to save the state on exiting. You can get the state with (org-outline-overlay-data) and restore it with (org-set-outline-overlay-data).
    – John Kitchin
    Commented Jun 7, 2017 at 14:01

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Reset to default
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You'd need to persist the result of org-outline-overlay-data on save/exit, then restore it on open/start with org-set-outline-overlay-data.

You can see an example of this in this answer.

(Sorry this should've been a comment but I don't have the rep yet.)

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    Seems like there is no way to even do this anymore, due to recent changes. Very unfortunate.
    – TTimo
    Commented Sep 17, 2021 at 16:38

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