Decrypt again after a draft was closed
* src/mail.cpp (m_decrypt_again, isDecryptAgain, setDecryptAgain): New state variable. * src/mail.h: Update accordingly. * src/mailitem-events.cpp (BeforeRead): Schedule decrypt if a closed mail was before read again. (Close): Mark closed drafts for potential decrypt again. * src/windowmessage.cpp, src/windowmessages.h (DECRYPT): New.
This allows us to detach an inline editor draft, edit it,
close it and continue editing in the inline editor.