Properly scope fully-qualified class name nodes (#56)

Properly scope fully-qualified class name nodes and fix unrelated bug stripping \ from start of FQN

Closes #53

Author: padraic

src/NodeVisitor/FullyQualifiedNamespaceUseScoperNodeVisitor.php

@@ -40,7 +40,7 @@ public function enterNode(Node $node)
             && false === ($node->hasAttribute('phpscoper_ignore')
             && true === $node->getAttribute('phpscoper_ignore'))
         ) {
-            return new Name(Name::concat($this->prefix, (string) $node));
+            return new Name('\\'.Name::concat($this->prefix, (string) $node));
         }
 
         return $node;

src/NodeVisitor/IgnoreNamespaceScoperNodeVisitor.php

@@ -28,7 +28,7 @@ public function enterNode(Node $node)
     {
         if ($node instanceof FullyQualified
             && $node->isFullyQualified()
-            && 1 === count($node->getSubNodeNames())
+            && 1 === count($node->parts)
         ) {
             $node->setAttribute('phpscoper_ignore', true);
         }

tests/Scoper/PhpScoperTest.php

@@ -590,6 +590,28 @@ public function provideValidFiles()
 
 use const Humbug\FooNamespace\FOO;
 
+PHP
+        ];
+
+        //
+        // FQN usage for a name
+        //
+        // ====================
+
+        yield '[FQN usage for a name] fully qualified class' => [
+            <<<'PHP'
+<?php
+
+new \Foo\Bar();
+
+PHP
+            ,
+            'Humbug',
+            <<<'PHP'
+<?php
+
+new \Humbug\Foo\Bar();
+
 PHP
         ];