@NotNull
    @Override
    public Function<? super PsiElement, String> getCommonTooltip(@NotNull List<? extends MergeableLineMarkerInfo<?>> infos) {
      return FunctionUtil.nullConstant();
    }
@NotNull
    @Override
    public Function<? super PsiElement, String> getCommonTooltip(@NotNull List<? extends MergeableLineMarkerInfo<?>> infos)