Merge branch '4.4' into 5.0

* 4.4:
  Add missing symfony/mime to require-dev
  [Validator] Added the missing Mongolian translations
  [ErrorHandler] Never throw on warnings triggered by assert() and set assert.exception=1 in Debug::enable()
  refactor(Process): fromShellCommandLine
  [Mailer] Do not ping the SMTP server before sending every message

Author: nicolas-grekas

PhpProcess.php

@@ -11,6 +11,7 @@
 
 namespace Symfony\Component\Process;
 
+use Symfony\Component\Process\Exception\LogicException;
 use Symfony\Component\Process\Exception\RuntimeException;
 
 /**
@@ -49,6 +50,14 @@ public function __construct(string $script, string $cwd = null, array $env = nul
         parent::__construct($php, $cwd, $env, $script, $timeout);
     }
 
+    /**
+     * {@inheritdoc}
+     */
+    public static function fromShellCommandline(string $command, string $cwd = null, array $env = null, $input = null, ?float $timeout = 60)
+    {
+        throw new LogicException(sprintf('The "%s()" method cannot be called when using "%s".', __METHOD__, self::class));
+    }
+
     /**
      * {@inheritdoc}
      */

Tests/PhpProcessTest.php

@@ -12,6 +12,7 @@
 namespace Symfony\Component\Process\Tests;
 
 use PHPUnit\Framework\TestCase;
+use Symfony\Component\Process\Exception\LogicException;
 use Symfony\Component\Process\PhpExecutableFinder;
 use Symfony\Component\Process\PhpProcess;
 
@@ -60,4 +61,14 @@ public function testPassingPhpExplicitly()
         $process->run();
         $this->assertEquals($expected, $process->getOutput());
     }
+
+    public function testProcessCannotBeCreatedUsingFromShellCommandLine()
+    {
+        static::expectException(LogicException::class);
+        static::expectExceptionMessage('The "Symfony\Component\Process\PhpProcess::fromShellCommandline()" method cannot be called when using "Symfony\Component\Process\PhpProcess".');
+        PhpProcess::fromShellCommandline(<<<PHP
+<?php echo 'Hello World!';
+PHP
+        );
+    }
 }