Pre-rendered links break Markdown links

[adam-p]

If a pre-rendered link is used at the URL in a Markdown Link, the rendered link will be incorrect.

This...

[Link name](<a href="http://example.com">http://example.com</a>)

...renders to this...

<a href="[http://example.com](http://example.com">Link name</a>)

This does not occur for MD links that use plaintext links. (So that's a workaround, for now.) The problem is almost certainly due to the feature in Markdown Here's where it leaves pre-rendered links intact. (Every time I put in a feature that deviates from the MD spec I break something. But I think this deviation is important, so I'll try to fix this without ripping it out.)

Making this a high priority bug, as it can result in users unknowingly having broken links.

Screenshot from user:

(Report from user Mitchell W. via email.)

[adam-p]

Fixed in rev 2a8ceea. Will be in next release.

As predicted, the problem was due to the feature where pre-formatted links are retained during rendering (per issue #49). It was implemented too simplistically and was retaining pre-formatted links that were inside Markdown links. Which made stuff break.

Limitation on the fix: Pre-formatted links inside square brackets ([]) are not retained. I think that this is an acceptable trade-off.

Tests have been added to help catch regressions.