create-item: push linkable events.

push linkable object-added/removed events.

src/scripts/create-item.lua

@@ -123,6 +123,11 @@ AsyncEventHook {
         Log.info(item, "activated item for node " .. tostring(id))
         item:register ()
         transition:advance()
+
+        props = {}
+        props["event.subject.type"] = "linkable"
+        EventDispatcher.push_event { type = "object-added",
+            priority = 50, properties = props, subject = item}
       end,
     },
   },
@@ -156,5 +161,10 @@ SimpleEventHook {
       items[id]:remove ()
       items[id] = nil
     end
+
+    props = {}
+    props["event.subject.type"] = "linkable"
+    EventDispatcher.push_event { type = "object-removed",
+        priority = 50, properties = props, subject = item}
   end
 }:register()