private static @NotNull AnAction createMergeTabsAction(@NotNull ContentManager manager, @NotNull TabGroupId groupId) {
    return new DumbAwareAction(IdeBundle.message("action.text.merge.tabs.to.group", groupId.getDisplayName())) {
      @Override
      public void actionPerformed(@NotNull AnActionEvent e) {
        ContentUtilEx.mergeTabs(manager, groupId);
      }
    };
  }
private static @NotNull AnAction createMergeTabsAction(@NotNull ContentManager manager, @NotNull TabGroupId groupId)