private static boolean isEnabled(DataContext dataContext) {
    Project project = CommonDataKeys.PROJECT.getData(dataContext);
    if (project == null ||
        EditorGutter.KEY.getData(dataContext) != null ||
        Boolean.TRUE.equals(dataContext.getData(CommonDataKeys.EDITOR_VIRTUAL_SPACE))) {
      return false;
    }
    return canFindUsages(project, dataContext) ||
           !allTargets(dataContext).isEmpty();
  }
private static boolean isEnabled(DataContext dataContext)