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Normally entire PDFs are encrypted (or not). But it is also possible to only encrypt attachments. It is then also possible to *only* prompt for a password when the user opens them. In the existing flow, prompting for passwords happens because things are decrypted. A specific error is thrown, caught, and the user is prompted. To keep this flow working, this PR changes to decrypting attachments on demand, instead of eagerly. This sounds logical: to not read attachments on startup. I’ve extensively tested this, not only with regular attachments, but also with outline items and attachments in annotations. This PR builds on GH-21234. It’s an alternative to the naïve GH-20732. Closes GH-20049.