[AutoImport] Handle auto import short name on global namespace (#7086)

* [AutoImport] Handle auto import short name on global namespace

* Fix

Author: samsonasik

rules-tests/CodingStyle/Rector/Namespace_/ImportFullyQualifiedNamesRector/Fixture/global_namespace.php.inc

@@ -0,0 +1,29 @@
+<?php
+
+namespace
+{
+    class GlobalNamespace
+    {
+        public function create()
+        {
+            return new \DateTime();
+        }
+    }
+}
+
+?>
+-----
+<?php
+
+namespace
+{
+    class GlobalNamespace
+    {
+        public function create()
+        {
+            return new DateTime();
+        }
+    }
+}
+
+?>

rules/CodingStyle/Application/UseImportsAdder.php

@@ -233,6 +233,12 @@ private function createUses(
                     continue;
                 }
 
+                if ($namespaceName === null
+                    && $importType instanceof FullyQualifiedObjectType
+                    && substr_count(ltrim($importType->getClassName(), '\\'), '\\') === 0) {
+                    continue;
+                }
+
                 // already imported in previous cycle
                 $newUses[] = $importType->getUseNode($type);
             }