Fix overridden blocks are not rendered (#19)

See #17.

LICENSE

@@ -1,6 +1,6 @@
 The MIT License (MIT)
 
-Copyright (c) 2014-2023 Eugene Leonovich
+Copyright (c) 2014-2024 Eugene Leonovich
 
 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal

src/DeferredExtension.php

@@ -19,6 +19,7 @@
 final class DeferredExtension extends AbstractExtension
 {
     private $blocks = [];
+    private $clearBlocksOnBufferCleanup = true;
 
     public function getTokenParsers() : array
     {
@@ -37,7 +38,9 @@ public function defer(Template $template, string $blockName) : void
         $index = \count($this->blocks[$templateName]) - 1;
 
         \ob_start(function (string $buffer) use ($index, $templateName) {
-            unset($this->blocks[$templateName][$index]);
+            if ($this->clearBlocksOnBufferCleanup) {
+                unset($this->blocks[$templateName][$index]);
+            }
 
             return $buffer;
         });
@@ -51,7 +54,9 @@ public function resolve(Template $template, array $context, array $blocks) : voi
         }
 
         while ($blockName = \array_pop($this->blocks[$templateName])) {
+            $this->clearBlocksOnBufferCleanup = false;
             $buffer = \ob_get_clean();
+            $this->clearBlocksOnBufferCleanup = true;
 
             $blocks[$blockName] = [$template, 'block_'.$blockName.'_deferred'];
             $template->displayBlock($blockName, $context, $blocks);

tests/Fixtures/inherited.test

@@ -0,0 +1,12 @@
+--TEST--
+inherited
+--TEMPLATE--
+{% extends "layout.twig" %}
+{% block bar deferred %}[bar-overridden]{% endblock %}
+--TEMPLATE(layout.twig)--
+{% block foo deferred %}[foo]{% endblock %}
+{% block bar deferred %}[bar]{% endblock %}
+--DATA--
+return []
+--EXPECT--
+[bar-overridden][foo]

tests/IntegrationTest.php

@@ -56,11 +56,7 @@ public function testDeferredBlocksAreClearedOnRenderingError() : void
             ',
         ]);
 
-        $twig = new Environment($loader, [
-            'cache' => false,
-            'strict_variables' => true,
-        ]);
-
+        $twig = new Environment($loader);
         $twig->addExtension(new DeferredExtension());
         $twig->addFunction(new TwigFunction('error', static function () {
             throw new \RuntimeException('Oops');