Filter conflict: external links can be rendered two times

There are 2 radeox filters that output links, the URLFIlter and LinkFilter. The URLFilter recognizes textual links inside the document, and the LinkFilter processes wiki links.

In the following example:

 [please visit http://www.w3.org/ >http://www.w3.org/]

First the LinkFilter is executed, resulting in:

<span class="wikilink> <a href="http://www.w3.org/">please visit http://www.w3.org/ </a></span>

Then the URLFilter is executed, resulting in:

<span class="wikilink> <a href="http://www.w3.org/">please visit <span class="nobr"><a href="http://www.w3.org/"http://www.w3.org/</a></span> </a></span>

The URLFilter just checks that the URL isn't quoted, as an attribute, thus allowing the example above.

The solution is a better matching pattern, which prevents such situations.