performance improvements (#2329)

* remove work from constructor
* refactor twig extensions
* upgrade theme
* replace sub-request with direct template rendering

tests/Twig/Runtime/EncoreExtensionTest.php

@@ -0,0 +1,47 @@
+<?php
+
+/*
+ * This file is part of the Kimai time-tracking app.
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace App\Tests\Twig\Runtime;
+
+use App\Twig\Runtime\EncoreExtension;
+use PHPUnit\Framework\TestCase;
+use Symfony\Component\DependencyInjection\Container;
+use Symfony\Component\DependencyInjection\ParameterBag\ParameterBag;
+use Symfony\WebpackEncoreBundle\Asset\EntrypointLookupInterface;
+
+/**
+ * @covers \App\Twig\Runtime\EncoreExtension
+ */
+class EncoreExtensionTest extends TestCase
+{
+    protected function getSut(array $files = []): EncoreExtension
+    {
+        $entryLookup = $this->createMock(EntrypointLookupInterface::class);
+        $entryLookup->expects($this->any())->method('getCssFiles')->willReturn($files);
+
+        $container = new Container(new ParameterBag([]));
+        $container->set(EntrypointLookupInterface::class, $entryLookup);
+
+        return new EncoreExtension($container, __DIR__ . '/../');
+    }
+
+    public function testGetSubscribedServices()
+    {
+        self::assertEquals([EntrypointLookupInterface::class], EncoreExtension::getSubscribedServices());
+    }
+
+    public function testGetEncoreEntryCssSource()
+    {
+        $sut = $this->getSut(['test.css', 'test1.css']);
+        $css = 'body { margin: 0; }p
+{
+    color: red; font-style: italic; }';
+        self::assertEquals($css, $sut->getEncoreEntryCssSource('blub'));
+    }
+}