clean up some untitled files

.gitignore

@@ -5,3 +5,5 @@
 envs/
 lib/
 node_modules/
+untitled*
+Untitled*

src/editor.ts

@@ -327,11 +327,9 @@ export class DrawioFactory extends ABCWidgetFactory<
   }
 
   protected createNewWidget(context: DocumentRegistry.Context): DrawioWidget {
-    return new DrawioWidget({
-      context,
-      content: new IFrame({
-        sandbox: SANDBOX_EXCEPTIONS,
-      }),
+    const content = new IFrame({
+      sandbox: SANDBOX_EXCEPTIONS,
     });
+    return new DrawioWidget({ context, content });
   }
 }

testfiles/untitled1.dio

@@ -1 +0,0 @@
-<mxGraphModel dx="1856" dy="1259" grid="1" gridSize="10" guides="1" tooltips="1" connect="1" arrows="1" fold="1" page="1" pageScale="1" pageWidth="850" pageHeight="1100" background="#ffffff"><root><mxCell id="0"/><mxCell id="1" parent="0"/><mxCell id="2" value="" style="whiteSpace=wrap;html=1;aspect=fixed;" vertex="1" parent="1"><mxGeometry x="450" y="270" width="80" height="80" as="geometry"/></mxCell></root></mxGraphModel>