Bug in lazy blockquote continuation (or corresponding spec is wrong, whichever)

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Issue 类型
缺陷
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基本清楚
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技术栈
c, markdown
领域
tooling

调研方向

首先使用 cmark 命令重现这两个示例,并将其 block quote 和列表解析与链接的 CommonMark 0.27 规范进行比较。确定是实现还是规范不正确,然后添加一个回归用例并记录已解决的行为。

由索引模型根据 Issue 内容生成。

描述

Current spec says:

If a string of lines Ls constitute a block
quote with contents Bs, then the result of deleting
the initial [block quote marker] from one or
more lines in which the next [non-whitespace character] after the [block
quote marker] is [paragraph continuation
text] is a block quote with Bs as its content.

http://spec.commonmark.org/0.27/#block-quotes

This spec is clear, and explicit. I see no ambiguity. Now consider this blockquote:

> This is _a_ paragraph continuation text
> 2. because the line starts with `2`, not `1`.

This blockquote is valid, and satisfies the "If a string of lines Ls constitute a block quote with contents Bs" condition. So according to the spec, we can delete the leading >. By doing so we get this:

> This is _a_ paragraph continuation text
2. because the line starts with `2`, not `1`.

This blockquote, according to the spec, must be identical to the former one. However cmark does not agree.

% cmark <<'EOS'
> This is _a_ paragraph continuation text
> 2. because the line starts with `2`, not `1`.
EOS
<blockquote>
<p>This is <em>a</em> paragraph continuation text
2. because the line starts with <code>2</code>, not <code>1</code>.</p>
</blockquote>
% cmark <<'EOS'
> This is _a_ paragraph continuation text
2. because the line starts with `2`, not `1`.
EOS
<blockquote>
<p>This is <em>a</em> paragraph continuation text</p>
</blockquote>
<ol start="2">
<li>because the line starts with <code>2</code>, not <code>1</code>.</li>
</ol>
%

Is it intentional?

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