CI 1.7.2 to 2.0.2 index.php

[eluser]Shiro[/eluser]
Dear developer,

OS: Windows 7 SP1
Wamp Server 2.1
PHP 5.2.13
Apache 2.2.11

I just switch 1.7.2 to 2.0.2, I found a "bug". It looks like 1.7.2 index.php done better job than 2.0.2 index.php

My CI is put under another project, more deeper path
\www\my_project\lvl1\lvl2\codeigniter\system

and I first load file is NOT \www\my_project\lvl1\lvl2\codeigniter\index.php but
is \www\my_project\index.php then request CI index file \www\my_project\lvl1\lvl2\codeigniter\index.php
I think this is why the code 2.0.2 not working, but 1.7.2 is working.

When I run the system, I get this:-

Your system folder path does not appear to be set correctly. Please open the following file and correct this: index.php

Code 1.7.2

Code:

if (strpos($system_folder, '/') === FALSE)
{
    if (function_exists('realpath') AND @realpath(dirname(__FILE__)) !== FALSE)
    {
        $system_folder = realpath(dirname(__FILE__)).'/'.$system_folder;
    }
}
else
{
    // Swap directory separators to Unix style for consistency
    $system_folder = str_replace("\\", "/", $system_folder);
}

Code 2.0.2

Code:

// Set the current directory correctly for CLI requests
    if (defined('STDIN'))
    {
        chdir(dirname(__FILE__));
    }

    if (realpath($system_path) !== FALSE)
    {
        $system_path = realpath($system_path).'/';
    }

    // ensure there's a trailing slash
    $system_path = rtrim($system_path, '/').'/';

    // Is the system path correct?
    if ( ! is_dir($system_path))
    {
        exit("Your system folder path does not appear to be set correctly. Please open the following file and correct this: ".pathinfo(__FILE__, PATHINFO_BASENAME));
    }

As the comment state the "Resolve the system path for increased reliability"
I don't think it increased the reliability.

when I ech out $system_path, it show me "system/", no full path has been displayed.

Code:

var_dump(realpath($system_path));

output is bool(false)

Is this a bug?