fix: can't switch back to single input value for :default property

https://linear.app/logseq/issue/LOG-2810/cant-switch-back-to-single-input-value-for-default-property

src/main/frontend/components/property/value.cljs

@@ -292,7 +292,8 @@
         empty-block? (or (nil? parent) (zero? children-count))]
     (when empty-block?
       (when parent
-        (db/transact! repo [[:db/retractEntity (:db/id parent)]]))
+        (db/transact! repo [[:db/retractEntity (:db/id parent)]]
+          {:outliner-op :delete-blocks}))
       (property-handler/delete-property-value! repo block (:block/uuid property) value))
     (when (seq children)
       [:div.property-block-container.w-full

src/main/frontend/handler/db_based/property.cljs

@@ -353,8 +353,12 @@
                                 :block/properties properties'
                                 :block/refs refs}]
                               {:outliner-op :save-block}))
-              ;; remove block property if cardinality is not many
-              (remove-block-property! repo (:block/uuid block) property-id))))))))
+              (if (= :default (get-in property [:block/schema :type]))
+                (set-block-property! repo (:block/uuid block)
+                                     (:block/original-name property)
+                                     ""
+                                     {})
+                (remove-block-property! repo (:block/uuid block) property-id)))))))))
 
 (defn replace-key-with-id!
   "Notice: properties need to be created first"

src/main/frontend/modules/outliner/datascript.cljs

@@ -28,6 +28,7 @@
     (pipelines/invoke-hooks tx-report)
 
     (when (or (:outliner/transact? tx-meta)
+              (:outliner-op tx-meta)
               (:whiteboard/transact? tx-meta))
       (undo-redo/listen-db-changes! tx-report))