When I select the option "remember PGP passphrases as long as I'm logged in", seahorse adds the PGP passphrase to the login keyring so that it is known even for the next login. However, it should just not forget the passphrase for the current session instead.
Binary package hint: seahorse
When I select the option "remember PGP passphrases as long as I'm logged in", seahorse adds the PGP passphrase to the login keyring so that it is known even for the next login. However, it should just not forget the passphrase for the current session instead.