better distinguish URL schemes and windows drive letters

Author: xabbuh

Path.php

@@ -368,7 +368,7 @@ public static function isAbsolute(string $path): bool
         }
 
         // Strip scheme
-        if (false !== $schemeSeparatorPosition = strpos($path, '://')) {
+        if (false !== ($schemeSeparatorPosition = strpos($path, '://')) && 1 !== $schemeSeparatorPosition) {
             $path = substr($path, $schemeSeparatorPosition + 3);
         }
 

Tests/PathTest.php

@@ -375,6 +375,8 @@ public static function provideIsAbsolutePathTests(): \Generator
 
         yield ['C:/css/style.css', true];
         yield ['D:/', true];
+        yield ['C:///windows', true];
+        yield ['C://test', true];
 
         yield ['E:\\css\\style.css', true];
         yield ['F:\\', true];