Markdown adding spaces - a simpler case

@post

```html
<a href="mailto:404-Not-Found@example.com?subject=Hi!&amp;amp;body=Either type the email address or use the form. Thanks!"></a>
```

browser output

<pre lang="html"><code>&lt;a href="mailto:404-Not-Found@example.com?subject=Hi!&amp;amp;amp;body=Either type the email address or use the form. Thanks!"&gt;&lt;/a&gt;
          </code></pre>

posts_helper.rb

module PostsHelper
  def to_html(markdown)
    pipeline = HTML::Pipeline.new [
      HTML::Pipeline::MarkdownFilter,
      # HTML::Pipeline::SyntaxHighlightFilter # isolate problem - just use markdown filter
    ]

    pipeline.call(markdown)[:output].to_s
  end
end

show.html.haml

%h1= link_to @post.title, @post
= raw to_html @post.body_markdown
=# raw @post.body_html

%hr
%br

= render 'disqus'