Merge branch '2.7' into 2.8

* 2.7:
  Fix 7.2 compat layer
  Fix PHP 7.2 support
  [HttpFoundation] Add missing session.lazy_write config option
  [HttpFoundation] Combine Cache-Control headers
  [Form] fix parsing invalid floating point numbers
  Escape command usage when displaying it in the text descriptor
  Use for=ID on radio/checkbox label.

Author: nicolas-grekas

Tests/Command/CacheClearCommand/CacheClearCommandTest.php

@@ -55,7 +55,7 @@ public function testCacheIsFreshAfterCacheClearedWithWarmup()
         $finder = new Finder();
         $metaFiles = $finder->files()->in($this->kernel->getCacheDir())->name('*.php.meta');
         // simply check that cache is warmed up
-        $this->assertGreaterThanOrEqual(1, count($metaFiles));
+        $this->assertNotEmpty($metaFiles);
         $configCacheFactory = new ConfigCacheFactory(true);
         $that = $this;
 

Tests/Controller/ControllerTest.php

@@ -223,6 +223,9 @@ public function testRedirectToRoute()
         $this->assertSame(302, $response->getStatusCode());
     }
 
+    /**
+     * @runInSeparateProcess
+     */
     public function testAddFlash()
     {
         $flashBag = new FlashBag();

composer.json

@@ -24,7 +24,7 @@
         "symfony/config": "~2.8",
         "symfony/event-dispatcher": "~2.8|~3.0.0",
         "symfony/finder": "^2.0.5|~3.0.0",
-        "symfony/http-foundation": "~2.7",
+        "symfony/http-foundation": "~2.7.36|^2.8.29",
         "symfony/http-kernel": "^2.8.22",
         "symfony/polyfill-mbstring": "~1.0",
         "symfony/filesystem": "~2.3|~3.0.0",