Never prompts for passphrase after dismissing passphrase request

[Victor Engmark]

To reproduce:

1. Receive an encrypted email
   (Optional but relevant since to demonstrate that otherwise Enigmail is working as expected:
2. Click on the email
3. Decrypt the email successfully
4. Do other non-PGP stuff until the passphrase expires
   )
5. Click the encrypted email
6. Dismiss the passphrase dialogue
7. Click on a different email
8. Click the encrypted email for the third time

What I expected to happen: Thunderbird should prompt me for the passphrase again, or at least give some hint as to how I can decrypt the email.

What actually happens: The email rendering part of the window contains only a message "Enigmail" followed by "Missing passphrase; click on 'Details' button [sic] for more information", followed by a "Details" button. The button reveals a menu consisting of only two clickable items, "Enigmail Security Info…" and "Copy Enigmail Security Info". The security info is:

Missing passphrase

gpg: decryption failed: No secret key

Which is wrong on at least some level, since I decrypted the same email earlier. Decryption also works fine if I restart Thunderbird, but that really should not be necessary.

[Patrick Brunschwig]

Enigmail remembers the last decrypted message. And apparently it doesn't correctly notice if you didn't enter the password correctly and just re-displays the previous information. To make Enigmail correctly re-load the message click on menu Enigmail > Reload Message (or on any other PGP/MIME encrypted message).

If you don't see the menu item "Reload Message", first open the Enimgail preferences, and click on "Display expert settings and menus".

I'll fix this.