prevent re-setting unchanged objects

src/Model/chatModel.ts

@@ -351,10 +351,14 @@ export class Chat {
   addObject = (messageObject: MessageObject): void => {
     const existingObject = this.objects.value.get(messageObject.id);
     if (existingObject) {
+      let didChangeObject = existingObject.title != messageObject.title;
       existingObject.title = messageObject.title;
       Object.values(messageObject.contentVersions).forEach((content) => {
+        if (existingObject.contentVersions[content.id]) return;
         this.addObjectContent(existingObject, content);
+        didChangeObject = true;
       });
+      if (didChangeObject == false) return;
       this.objects.set(existingObject.id, existingObject);
     } else {
       this.objects.set(messageObject.id, messageObject);

src/Views/Objects/objectGridView.tsx

@@ -3,7 +3,6 @@ import * as React from "bloatless-react";
 import { Chat, MessageObject } from "../../Model/chatModel";
 
 import { ObjectEntryView } from "./objectEntryView";
-import { PlaceholderView } from "./placeholderView";
 
 export function ObjectGridView(
   chat: Chat,