nested html links are broken with parse_block_html

[jvanasco]

this is a variant of #81

example_in = '<div><a href="https://example.com">Example.com</a></div>'
mistune.markdown(example_in, escape=False, parse_block_html=True)

will generate:

<div><a href="<a href="https://example.com"&gt;Example.com">https://example.com"&gt;Example.com</a></a></div>

if escape is toggled to True, it is also broken:

'<div><a href="<a href="https://example.com"&gt;Example.com"&gt;https://example.com"&gt;Example.com&lt;/a&gt;&lt;/a&gt;&lt;/div>

[lepture]

Current implementation of parse_block_html=True is not working well.

[frostming]

After a deep look into the source code, the root cause is when parsing the html body with inline, it uses a subset of default rules which doesn't contain inline_html rule. Then the body with urls will be captured by url rule.

I am glad to send a pull request

[lepture]

@frostming yes, please.