fix persist

Author: sprocketc

src/renderer/history/handlers.cljs

@@ -84,6 +84,9 @@
                   #(-> (select-keys % [pos])
                        (assoc-in [pos :index] 0)
                        (assoc-in [pos :children] [])
+                       ;; This state needs to be persisted, so we cannot pass a function
+                       ;; as an explanation, because it's not serializable.
+                       (assoc-in [pos :explanation] "Initial state")
                        (update pos dissoc :parent)))))))
 
 (m/=> preview [:-> App uuid? App])