Finds where a jump target lands, asking CUBE live for what the roster
and the index lack: a feed shared since the roster was walked, or a node
in one. A node's feed is adopted into the roster on the way, so the
place the answer names can be entered at once. A bare number that is
both a feed and a node answers both; the caller asks which.
Parameters
target: string
A feed id, a node id, or a feed_N / <plugin>_N name.
Finds where a jump target lands, asking CUBE live for what the roster and the index lack: a feed shared since the roster was walked, or a node in one. A node's feed is adopted into the roster on the way, so the place the answer names can be entered at once. A bare number that is both a feed and a node answers both; the caller asks which.