[DeadCode] Skip RemoveEmptyClassMethodRector on final method in non-final class (#4943)

rules/dead-code/src/Rector/ClassMethod/RemoveEmptyClassMethodRector.php

@@ -88,6 +88,10 @@ CODE_SAMPLE
             return null;
         }
 
+        if ($node->isFinal() && ! $classLike->isFinal()) {
+            return null;
+        }
+
         if ($this->shouldSkipNonFinalNonPrivateClassMethod($classLike, $node)) {
             return null;
         }

rules/dead-code/tests/Rector/ClassMethod/RemoveEmptyClassMethodRector/Fixture/final_in_final_class.php.inc

@@ -0,0 +1,22 @@
+<?php
+
+namespace Rector\DeadCode\Tests\Rector\ClassMethod\RemoveEmptyClassMethodRector\Fixture;
+
+final class FinalInFinalClass
+{
+    final public function __construct()
+    {
+    }
+}
+
+?>
+-----
+<?php
+
+namespace Rector\DeadCode\Tests\Rector\ClassMethod\RemoveEmptyClassMethodRector\Fixture;
+
+final class FinalInFinalClass
+{
+}
+
+?>

rules/dead-code/tests/Rector/ClassMethod/RemoveEmptyClassMethodRector/Fixture/keep_final_in_non_final_class.php.inc

@@ -0,0 +1,10 @@
+<?php
+
+namespace Rector\DeadCode\Tests\Rector\ClassMethod\RemoveEmptyClassMethodRector\Fixture;
+
+abstract class KeepFinalInNonFinalClass
+{
+    final public function __construct()
+    {
+    }
+}