Issue with css compressor when using relative urls on some css files

[imarklee]

On some extensions like EasyBlog, it uses relative urls.

Before compression: http://take.ms/azG1w

After compression: http://take.ms/PZi0v

The problem lies on line 1122 in core/helix3.php

global $absolute_url;
$base = dirname($absolute_url);
while (preg_match('/^\.\.\//', $url))
{
	$base = dirname($base);
	$url  = substr($url, 3);
}
$url = $base . '/' . $url;

The $base is always / and this causes the end result to be //path/to/item . Because // also represents an URI, it thinks that path is a domain name.