fn kept_with(action: &Action, flags: &str, role: Role) -> Option<String>Expand description
What becomes of the local copy once the server took action on it in a
folder of role: its letters now, or none when it left this folder (the
next sync brings the copy into the other). Said not spam, it keeps its
keyword here as on the server; said spam in a Junk folder, it stays there.