Issue #2014851 by hlieberman, Wim Leers: Fixed Drupal CSS preprocessing breaks...

Issue #2014851 by hlieberman, Wim Leers: Fixed Drupal CSS preprocessing breaks protocol-relative paths.

core/lib/Drupal/Core/Asset/CssOptimizer.php

@@ -205,7 +205,7 @@ protected function processCss($contents, $optimize = FALSE) {
 
     // Replaces @import commands with the actual stylesheet content.
     // This happens recursively but omits external files.
-    $contents = preg_replace_callback('/@import\s*(?:url\(\s*)?[\'"]?(?![a-z]+:)([^\'"\()]+)[\'"]?\s*\)?\s*;/', array($this, 'loadNestedFile'), $contents);
+    $contents = preg_replace_callback('/@import\s*(?:url\(\s*)?[\'"]?(?![a-z]+:)(?!\/\/)([^\'"\()]+)[\'"]?\s*\)?\s*;/', array($this, 'loadNestedFile'), $contents);
 
     return $contents;
   }

core/tests/Drupal/Tests/Core/Asset/CssOptimizerUnitTest.php

@@ -112,6 +112,8 @@ function testOptimizeProvider() {
       // - A background image with relative paths, which must be rewritten.
       // - The rewritten background image path must also be passed through
       //   file_create_url(). (https://drupal.org/node/1961340)
+      // - Imported files that are external (protocol-relative URL or not)
+      //   should not be expanded. (https://drupal.org/node/2014851)
       1 => array(
         array(
           'group' => -100,

core/tests/Drupal/Tests/Core/Asset/css_test_files/css_input_with_import.css

@@ -2,6 +2,8 @@
 
 @import "import1.css";
 @import "import2.css";
+@import url("http://example.com/style.css");
+@import url("//example.com/style.css");
 
 body {
   margin: 0;

core/tests/Drupal/Tests/Core/Asset/css_test_files/css_input_with_import.css.optimized.css

 ul,select{font:1em/160% Verdana,sans-serif;color:#494949;}.ui-icon{background-image:url(images/icon.png);}
 p,select{font:1em/160% Verdana,sans-serif;color:#494949;}
-body{margin:0;padding:0;background:#edf5fa;font:76%/170% Verdana,sans-serif;color:#494949;}.this .is .a .test{font:1em/100% Verdana,sans-serif;color:#494949;}.this
+@import url("http://example.com/style.css");@import url("//example.com/style.css");body{margin:0;padding:0;background:#edf5fa;font:76%/170% Verdana,sans-serif;color:#494949;}.this .is .a .test{font:1em/100% Verdana,sans-serif;color:#494949;}.this
 .is
 .a
 .test{font:1em/100% Verdana,sans-serif;color:#494949;}textarea,select{font:1em/160% Verdana,sans-serif;color:#494949;}