[Bug 1902801]

[Kai Engert]

Sorry for the delays, I was out sick.

I can confirm the bug. When recently re-enabling this feature, I had tested only using encrypted attachments which decrypt to plain text.
The bug occurs if the attachment decrypts to binary data.

I have a fix that I will send for review.

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https://bugs.launchpad.net/bugs/1902801

Title:
  Encrypted attachments cannot be opened or saved as decrypted files

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