Uri::convertUrl not working with Windows paths

[hundblue]

The Uri::convertUrl function does not correctly handle paths prefixed by drive letters, like e.g. E:/grav/user/pages/02.foo. As a consequence, the directory-relative links do not work in Windows.

The demo code below shows the problem. The call to Uri::parseUrl splits E:/grav/user/pages/03.bar to a "scheme" E and the remaing path /grav/user/pages/03.bar.

<?php
use Grav\Common\Utils;
use Grav\Common\Uri;

$page_path = 'E:/grav/user/pages/02.foo'; // $page->path();
$url_path  = '../03.bar';
$path            = $page_path.'/'.$url_path;
$normalized_path = Utils::normalizePath ($path);
$url_bits        = Uri::parseUrl($normalized_path);
$full_path       = $url_bits['path'];

$inspect = [
  'path'            => $path,
  'normalized_path' => $normalized_path,
  'url_bits'        => $url_bits,
  'full_path'       => $full_path,
];
/*
path => "E:/grav/user/pages/02.foo/../03.bar" (35)
normalized_path => "E:/grav/user/pages/03.bar" (25)
url_bits => array (2)
    scheme => "E"
    path => "/grav/user/pages/03.bar" (23)
full_path => "/grav/user/pages/03.bar" (23)
*/