Removing of HeadingBlockParser from pipeline.BlockParsers is not affect setext headings

[magicxor]

I'm trying to make stop markdig from parsing headers (h1-h6).

        public static MarkdownPipelineBuilder DisableHeadings(this MarkdownPipelineBuilder pipeline)
        {
            var headingBlockParser = pipeline.BlockParsers.Find<HeadingBlockParser>();
            if (headingBlockParser != null)
            {
                pipeline.BlockParsers.Remove(headingBlockParser);
            }
            return pipeline;
        }

But this code doesn't affect setext headings.
Is it normal behavior? How can I solve this problem?
Thanks.

[xoofx]

Unfortunately, disabling setext headings requires an internal change because the parsing is performed inside the ParagraphBlockParser. It is perfectly possible to do it by adding a boolean property on this parser, and provide an extension for it (PR welcome!)