anchor.diff:  
     void _savePersistedTabs() {
       List<String> filesUuids = [];
  -    for(EditorTab tab in tabs) {
  +    for (EditorTab tab in tabs) {
         if (tab.persisted) filesUuids.add(tab.file.uuid);
       }
   
  
positive.code:   bool _active = false;
  
    AceEditorTab(EditorArea parent, this.provider, this.editor, Resource file)
      : super(parent, file) {
      page = editor.element;
      editor.onModification.listen((_) => parent.persistTab(file));
    }
  
negative.code: 
    Stream<String> get onNameChange => _nameController.stream;
  
    // TabView
    Tab add(EditorTab tab, {bool switchesTab: true}) {
      _tabOfFile[tab.file] = tab;
  