lib/src/flow_editor_page.dart

@@ -218,10 +218,7 @@ class _FlowEditorPageState extends State<FlowEditorPage>
     // change what the list must show.
     if (widget.flowsDir != old.flowsDir ||
         !setEquals(widget.sampleFlowNames, old.sampleFlowNames)) {
-      final fresh = _listFiles();
+      setState(() => _files = _listFiles());
-      setState(() {
-        _files = fresh;
-      });
     }
   }