[ExpressionLanguage] Fix null coalescing propagation

Author: fancyweb

src/Symfony/Component/ExpressionLanguage/Node/NullCoalesceNode.php

@@ -39,7 +39,7 @@ public function compile(Compiler $compiler): void
     public function evaluate(array $functions, array $values): mixed
     {
         if ($this->nodes['expr1'] instanceof GetAttrNode) {
-            $this->nodes['expr1']->attributes['is_null_coalesce'] = true;
+            $this->addNullCoalesceAttributeToGetAttrNodes($this->nodes['expr1']);
         }
 
         return $this->nodes['expr1']->evaluate($functions, $values) ?? $this->nodes['expr2']->evaluate($functions, $values);
@@ -49,4 +49,17 @@ public function toArray(): array
     {
         return ['(', $this->nodes['expr1'], ') ?? (', $this->nodes['expr2'], ')'];
     }
+
+    private function addNullCoalesceAttributeToGetAttrNodes(Node $node): void
+    {
+        if (!$node instanceof GetAttrNode) {
+            return;
+        }
+
+        $node->attributes['is_null_coalesce'] = true;
+
+        foreach ($node->nodes as $node) {
+            $this->addNullCoalesceAttributeToGetAttrNodes($node);
+        }
+    }
 }

src/Symfony/Component/ExpressionLanguage/Tests/ExpressionLanguageTest.php

@@ -424,6 +424,9 @@ public function bar()
         yield ['foo["bar"]["baz"] ?? "default"', ['bar' => null]];
         yield ['foo["bar"].baz ?? "default"', ['bar' => null]];
         yield ['foo.bar().baz ?? "default"', $foo];
+        yield ['foo.bar.baz.bam ?? "default"', (object) ['bar' => null]];
+        yield ['foo?.bar?.baz?.qux ?? "default"', (object) ['bar' => null]];
+        yield ['foo[123][456][789] ?? "default"', [123 => []]];
     }
 
     /**