message: core: publicly expose getUndoStack and getRedoStack
diff: @@ -104,5 +104,7 @@ export function getRedoStack(state: ScopeState) {
  export const publicHistorySelectors = {
  getPendingChanges,
  - hasPendingChanges
  + hasPendingChanges,
  + getUndoStack,
  + getRedoStack
  }
  