[AssetMapper] Only download a CSS file if it is explicitly advertised

Author: weaverryan

src/Symfony/Component/AssetMapper/ImportMap/Resolver/JsDelivrEsmResolver.php

@@ -129,8 +129,9 @@ public function resolvePackages(array $packagesToRequire): array
 
             $entrypoints = $cssEntrypointResponse->toArray()['entrypoints'] ?? [];
             $cssFile = $entrypoints['css']['file'] ?? null;
+            $guessed = $entrypoints['css']['guessed'] ?? true;
 
-            if (!$cssFile) {
+            if (!$cssFile || $guessed) {
                 continue;
             }
 

src/Symfony/Component/AssetMapper/Tests/ImportMap/Resolver/JsDelivrEsmResolverTest.php

@@ -224,7 +224,7 @@ public static function provideResolvePackagesTests(): iterable
                 [
                     'url' => '/v1/packages/npm/[email protected]/entrypoints',
                     'response' => ['body' => ['entrypoints' => [
-                        'css' => ['file' => '/dist/css/bootstrap.min.css'],
+                        'css' => ['file' => '/dist/css/bootstrap.min.css', 'guessed' => false],
                     ]]],
                 ],
                 [