Inconsistent List Formatting With Linebreaks

[JoeJHoward]

I'm getting inconsistent list formatting on the last list item of both ordered and unordered lists when there is are line-breaks in the list item body text.

For example the following markdown:

1. One
   First body copy

2. Two
   Last body copy

The expected output should be:

<ol>
  <li>
    <p>One
    First body copy</p>
  </li>
  <li>
    <p>Two
    Last body copy</p>
  </li>
</ol>

But the parser strips the <p> tags on the last item and outputs:

<ol>
  <li>
    <p>One
    First body copy</p>
  </li>
  <li>Two
    Last body copy
  </li>
</ol>

[johnnymatthews]

I'm getting a similar issue. It looks like removing the returns between each list item in markdown removes the <p> tags from the HTML completely.

Original Markdown Input

- [List item one](#link-one)

- [List item two](#link-two)

- [List item three](#link-three)

- [List item four](#link-four)

Broken HTML Output

<ul>
    <li>
        <a href="#link-one">
            <p>List item one</p>
        </a>
    </li>
    <li>
        <a href="#link-two">
            <p>List item two</p>
        </a>
    </li>
    <li>
        <a href="#link-three">
            <p>List item three</p>
        </a>
    </li>
    <li>
        <a href="#link-four">
            List item four        <--- Missing <p> tags
        </a>
    </li>
</ul>

Modified Markdown Input

- [List item one](#link-one)
- [List item two](#link-two)
- [List item three](#link-three)
- [List item four](#link-four)

Working HTML Output

<ul>
    <li>
        <a href="#link-one">
            List item one
        </a>
    </li>
    <li>
        <a href="#link-two">
            List item two
        </a>
    </li>
    <li>
        <a href="#link-three">
            List item three
        </a>
    </li>
    <li>
        <a href="#link-four">
            List item four
        </a>
    </li>
</ul>

Edit

Here's a workaround if you really, really need your formatting to be perfect:

- [List item one](#link-one)

- [List item two](#link-two)

- [List item three](#link-three)

- [<p>List item four</p>](#link-four)        <--- Hardcoded <p> tags

[aidantwoods]

I just added this as a test-case in my PR #475 and it looks to be resolved there.
@erusev any chance at merging #475? It is a pretty minor change that's completely additive (I should mention that it does change test-case expectations though: they are changed to match the output of the commonmark reference parser for the respective inputs).