[Process] Fix escaping /X arguments on Windows

Author: nicolas-grekas

Process.php

@@ -1638,7 +1638,7 @@ private function escapeArgument(?string $argument): string
  if (str_contains($argument, "\0")) {
  $argument = str_replace("\0", '?', $argument);
  }
- if (!preg_match('/[\/()%!^"<>&|\s]/', $argument)) {
+ if (!preg_match('/[()%!^"<>&|\s]/', $argument)) {
  return $argument;
  }
  $argument = preg_replace('/(\\\\+)$/', '$1$1', $argument);

Tests/ProcessTest.php

@@ -1424,7 +1424,12 @@ public function testGetCommandLine()
  {
  $p = new Process(['/usr/bin/php']);
 
- $expected = '\\' === \DIRECTORY_SEPARATOR ? '"/usr/bin/php"' : "'/usr/bin/php'";
+ $expected = '\\' === \DIRECTORY_SEPARATOR ? '/usr/bin/php' : "'/usr/bin/php'";
+ $this->assertSame($expected, $p->getCommandLine());
+
+ $p = new Process(['cd', '/d']);
+
+ $expected = '\\' === \DIRECTORY_SEPARATOR ? 'cd /d' : "'cd' '/d'";
  $this->assertSame($expected, $p->getCommandLine());
  }