Merge branch '4.4' into 5.2

* 4.4:
  [CS] Replace easy occurences of ?: with ??

Author: derrabus

Formatter/OutputFormatterStyleStack.php

@@ -28,7 +28,7 @@ class OutputFormatterStyleStack implements ResetInterface
 
     public function __construct(OutputFormatterStyleInterface $emptyStyle = null)
     {
-        $this->emptyStyle = $emptyStyle ?: new OutputFormatterStyle();
+        $this->emptyStyle = $emptyStyle ?? new OutputFormatterStyle();
         $this->reset();
     }
 

Output/Output.php

@@ -40,7 +40,7 @@ abstract class Output implements OutputInterface
     public function __construct(?int $verbosity = self::VERBOSITY_NORMAL, bool $decorated = false, OutputFormatterInterface $formatter = null)
     {
         $this->verbosity = null === $verbosity ? self::VERBOSITY_NORMAL : $verbosity;
-        $this->formatter = $formatter ?: new OutputFormatter();
+        $this->formatter = $formatter ?? new OutputFormatter();
         $this->formatter->setDecorated($decorated);
     }