Several users complained about the fact that the new `pinentry` dialog
box that appears when being asked for a GnuPG password do not accept
copy and paste.
Actually that's a security feature of pinentry, see
/todo/pinentry_vs._paste.
I added a section to the KeepassX documentation to document how to use
the AutoType feature as a workaround:
https://tails.boum.org/doc/encryption_and_privacy/manage_passwords/#index4h1
I'm waiting for a review before making the ticket as done.