Protected_Protected_Protected_Protected_Protected_ProtectedcancelReadonlyonProtected ReadonlyonProtected ReadonlyscmProtected ReadonlytoProtected ReadonlytoProtectedgetReturns the revisions of the current branch ref, its remote tracking ref,
and the merge-base ref to pass to provideHistoryItems. Providers walk
history starting from these revisions.
ProtectedinitProtectedload
Returns true once the model has completed at least one load attempt (regardless of whether history items were found). This is used by the widget to distinguish "still initializing" from "no history".