private static @NotNull AnAction createSplitTabsAction(@NotNull TabbedContent content) {
    return new DumbAwareAction(IdeBundle.message("action.text.split.group", content.getTitlePrefix())) {
      @Override
      public void actionPerformed(@NotNull AnActionEvent e) {
        content.split();
      }
    };
  }
private static @NotNull AnAction createSplitTabsAction(@NotNull TabbedContent content)