PHP-CS-Fixer: PHPUnit annotations for ignoring code coverage are reformatted incorrectly

The PHP version you are using ($ php -v):

$ php -v
PHP 7.2.7 (cli) (built: Jun 19 2018 14:40:10) ( NTS )
Copyright (c) 1997-2018 The PHP Group
Zend Engine v3.2.0, Copyright (c) 1998-2018 Zend Technologies

PHP CS Fixer version you are using ($ php-cs-fixer -V):

$ php-cs-fixer -V
PHP CS Fixer 2.12.1 Long Journey by Fabien Potencier and Dariusz Ruminski (beef6cb)

Original

<?php
class C
{
    public function m()
    {
    // @codeCoverageIgnoreStart
    }
    // @codeCoverageIgnoreEnd

    public function n()
    {
    } // @codeCoverageIgnore
}

Output

   1) C.php (class_attributes_separation, braces)
      ---------- begin diff ----------
--- Original
+++ New
@@ -3,11 +3,14 @@
 {
     public function m()
     {
-    // @codeCoverageIgnoreStart
+        // @codeCoverageIgnoreStart
     }
+
     // @codeCoverageIgnoreEnd
 
     public function n()
     {
-    } // @codeCoverageIgnore
+    }
+
+    // @codeCoverageIgnore
 }

      ----------- end diff -----------

Result

<?php
class C
{
    public function m()
    {
        // @codeCoverageIgnoreStart
    }

    // @codeCoverageIgnoreEnd

    public function n()
    {
    }

    // @codeCoverageIgnore
}

While the multi-line annotations @codeCoverageIgnoreStart and @codeCoverageIgnoreEnd are only reformatted so that they look “ugly” (IMO), the single-line annotation @codeCoverageIgnore is reformatted so that it no longer has the desired effect.