autolink_email mangles URL if it contains 'mail'

[dlangille]

When the URL contains 'email', the mailto isn't seeing that it's already in a tag.

% cat test.php
<?php

include('lib_autolink.php');

$html = "http://this.is.link/x.php?email=somebody@host.com&anotheremail=other@other.org&x=1";

$html = autolink($html,0);

echo $html . "\n";

$html = autolink_email($html);

echo $html . "\n";

The output is:

% php test.php
<a href="http://this.is.link/x.php?email=somebody@host.com&amp;anotheremail=other@other.org&amp;x=1">this.is.link/x.php?email=somebody@host.com&amp;anotheremail=other@other.org&amp;x=1</a>
<a href="http://this.is.link/x.php?email=somebody@host.com&amp;<a href="mailto:anotheremail=other@other.org&amp">anotheremail=other@other.org&amp</a>;x=1"><a href="mailto:this.is.link/x.php?email=somebody@host.com&amp">this.is.link/x.php?email=somebody@host.com&amp</a>;<a href="mailto:anotheremail=other@other.org&amp">anotheremail=other@other.org&amp</a>;x=1</a>

When I expected the second line to be the same as the first.