Trailing period prevents links within emphasis

[cliss]

Re-opened here from markdown-it #94. As was pointed out to me by @rlidwka, this seems to be broken in the dingus as well, despite what I initially thought below. As per @rlidwka, it appears the trailing period is causing the confusion.

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I'm seeing a bug wherein a link within an emphasis/bold block is not showing as strong.

Example:

> md.render('This is a __[test of a link in bold](http://www.github.com/)__.')
'<p>This is a __<a href="http://www.github.com/">test of a link in bold</a>__.</p>\n'

I would have expected:

'<p>This is a <strong><a href="http://www.github.com/">test of a link in bold</a></strong>.</p>'

You'll note that this works as expected when the link is not included:

> md.render('This is a __test of bold__.')
'<p>This is a <strong>test of bold</strong>.</p>\n'

This seems to work as I expected on the Commonmark Dingus.

If this user error, my utmost apologies; please let me know what I'm doing wrong!

[colinodell]

I ran those strings through Babelmark2 and am seeing similar results.

[colinodell]

Actually, it looks the issue occurs regardless of which punctuation character appears at the end.

Could this be a bug where the ending __ isn't being identified as a right-flanking delimiter run?

[jgm]

See commonmark/commonmark.js#12 - this is the same issue, I believe, and a solution is sketched out there. I mean to give this some further thought, but will probably implement what is described there. Comments welcome.

[puzrin]

I think, that's implementation bug in markdown-it: markdown-it/markdown-it#97

Spec looks good for me with last commits.

[puzrin]

Tests missed. Example with link needed in spec.