@Override
      public void run(AnActionButton button) {
        final FileChooserDescriptor dirChooser = FileChooserDescriptorFactory.createSingleFolderDescriptor();
        dirChooser.setShowFileSystemRoots(true);
        dirChooser.setHideIgnored(true);
        dirChooser.setTitle(UIBundle.message("file.chooser.default.title"));
        FileChooser.chooseFiles(dirChooser, myProject, null, files -> {
          for (VirtualFile file : files) {
            // adding to the end
            final String path = file.getPresentableUrl();
            if (processor.addPath(myWorkingCollection, path)) {
              myListModel.addElement(path);
            }
          }
        });
      }
@Override
      public void run(AnActionButton button)