Fixed filesystem issue on windows

src/Composer/Util/Filesystem.php

@@ -223,11 +223,11 @@ class Filesystem
         }
 
         $commonPath = $to;
-        while (strpos($from.'/', $commonPath.'/') !== 0 && '/' !== $commonPath && !preg_match('{^[a-z]:/?$}i', $commonPath)) {
+        while (strpos($from.'/', $commonPath.'/') !== 0 && '/' !== $commonPath && !preg_match('{^[a-z]:/?$}i', $commonPath) && '.' !== $commonPath) {
             $commonPath = dirname($commonPath);
         }
 
-        if (0 !== strpos($from, $commonPath) || '/' === $commonPath) {
+        if (0 !== strpos($from, $commonPath) || '/' === $commonPath || '.' === $commonPath) {
             return $to;
         }
 
@@ -261,11 +261,11 @@ class Filesystem
         }
 
         $commonPath = $to;
-        while (strpos($from.'/', $commonPath.'/') !== 0 && '/' !== $commonPath && !preg_match('{^[a-z]:/?$}i', $commonPath)) {
+        while (strpos($from.'/', $commonPath.'/') !== 0 && '/' !== $commonPath && !preg_match('{^[a-z]:/?$}i', $commonPath) && '.' !== $commonPath) {
             $commonPath = dirname($commonPath);
         }
 
-        if (0 !== strpos($from, $commonPath) || '/' === $commonPath) {
+        if (0 !== strpos($from, $commonPath) || '/' === $commonPath || '.' === $commonPath) {
             return var_export($to, true);
         }