fix: DEFECT-1725删除界面后缀

@@ -2069,11 +2069,18 @@ App.prototype.updateDocumentTitle = function () {
 
     if (file != null) {
       const filename = (file.getTitle() != null) ? file.getTitle() : this.defaultFilename
-      title = `${filename} - ${title}`
+      title = `${filename}`
     }
 
     if (document.title != title)
       document.title = title
+  } else {
+    // TODO Thingskit 设置预览模式title
+    const file = this.getCurrentFile()
+    if (!file) return
+    const filename = (file.getTitle() != null) ? file.getTitle() : this.defaultFilename
+    if (document.title != filename)
+      document.title = filename
   }
 }
 

@@ -2057,7 +2057,10 @@
 	/**
 	 * Specifies the app name. Default is document.title.
 	 */
-	Editor.prototype.appName = 'draw.io';
+	// Editor.prototype.appName = 'draw.io';
+
+	// TODO Thingskit 隐藏title后缀
+	Editor.prototype.appName = '';
 
 	/**
 	 * TODO 创建文件时可选类型