[11.x] Always inherit parent attributes (#53011)

* Always inherit parent attributes

* tests

Author: royduin

src/Illuminate/View/ComponentAttributeBag.php

@@ -34,7 +34,7 @@ class ComponentAttributeBag implements ArrayAccess, IteratorAggregate, JsonSeria
      */
     public function __construct(array $attributes = [])
     {
-        $this->attributes = $attributes;
+        $this->setAttributes($attributes);
     }
 
     /**

tests/View/ViewComponentTest.php

@@ -4,6 +4,7 @@
 
 use Illuminate\View\Component;
 use Illuminate\View\ComponentAttributeBag;
+use Illuminate\View\ComponentSlot;
 use PHPUnit\Framework\TestCase;
 use ReflectionMethod;
 
@@ -70,6 +71,22 @@ public function testAttributeParentInheritance(): void
         $this->assertSame('class="override" type="submit"', (string) $component->attributes);
     }
 
+    public function testSlotAttributeParentInheritance(): void
+    {
+        $attributes = new ComponentAttributeBag(['class' => 'bar', 'type' => 'button']);
+
+        $slot = new ComponentSlot('test', [
+            'class' => 'foo',
+            'attributes' => $attributes,
+        ]);
+
+        $this->assertSame('class="foo bar" type="button"', (string) $slot->attributes);
+
+        // Test overriding parent class attributes
+        $slot->withAttributes(['class' => 'override', 'type' => 'submit']);
+        $this->assertSame('class="override" type="submit"', (string) $slot->attributes);
+    }
+
     public function testPublicMethodsWithNoArgsAreConvertedToStringableCallablesInvokedAndNotCached()
     {
         $component = new TestSampleViewComponent;