Function act 

pub(crate) fn act(
    qt: &CxxQtThread<Sioul>,
    shared: &Arc<Shared>,
    key: &str,
    action: &str,
    target: &str,
)

“read”, “unread”, “flag”, “unflag”, “archive”, “trash”, “junk”, “not-junk”, “spam”, “not-spam”, “move”. “Spam” and “Not spam”, from the review queue or the Reader, as the message’s folder asks: in a Junk folder (your filter moved it there), “Spam” keeps it there marked, “Not spam” brings it back to the inbox; elsewhere, “Spam” moves it into the Junk folder, “Not spam” leaves it where it is, marked.