The fork marker: " forked from 's message · " ("Someone" with no person; the "from" part only with an author; the time only when known). A draft: "New fork from 's message · nothing is saved until you send". AnchorAuthorName is the author the "from" part names: the source message's author for a fork with a source, else the anchor's.
AnchorAuthorName
The fork marker: " forked from 's message ·