Fix console: list 'namespace' command display all available commands

src/Symfony/Component/Console/Application.php

@@ -581,7 +581,7 @@ class Application
 
         $commands = array();
         foreach ($this->commands as $name => $command) {
-            if ($namespace === $this->extractNamespace($name)) {
+            if ($namespace === $this->extractNamespace($name, substr_count($namespace, ':') + 1)) {
                 $commands[$name] = $command;
             }
         }