Thanks Ihor for improve this file.

I'm also try to improve this file to improve large Org buffer saving performance.

I have some ideas:

- auto encrypt buffer on buffer save hook (currently mechanism, your patch improved it)
- auto decrypt on org-cycle expand headline if current headline is encrypted. e.g. on `org-cycle-hook`
- auto encrypt ONLY current fold action on headline scope if has crypt key specified. e.g. on `org-cycle-hook`

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[ stardiviner ]
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