Function heads_for_entry
pub fn heads_for_entry(
doc: &mut AutoCommit,
id: &HistoryEntryId,
) -> Option<Vec<ChangeHash>>Expand description
The other half of HistorySource::entries: a restore needs a document
state for the HistoryEntryId a widget hands back. None when the id
names no change in this document — mixed ids from two artifacts.