[DeadCode] Do not remove class method if required by parent ocntract

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

@@ -14,6 +14,7 @@
 use Rector\DeadCode\NodeAnalyzer\DataProviderMethodNamesResolver;
 use Rector\NodeCollector\ValueObject\ArrayCallable;
 use Rector\NodeTypeResolver\Node\AttributeKey;
+use Rector\VendorLocker\NodeVendorLocker\ClassMethodReturnVendorLockResolver;
 use Symplify\RuleDocGenerator\ValueObject\CodeSample\CodeSample;
 use Symplify\RuleDocGenerator\ValueObject\RuleDefinition;
 
@@ -32,9 +33,17 @@ final class RemoveUnusedPublicMethodRector extends AbstractRector implements Zer
      */
     private $calls = [];
 
-    public function __construct(DataProviderMethodNamesResolver $dataProviderMethodNamesResolver)
-    {
+    /**
+     * @var ClassMethodReturnVendorLockResolver
+     */
+    private $classMethodReturnVendorLockResolver;
+
+    public function __construct(
+        DataProviderMethodNamesResolver $dataProviderMethodNamesResolver,
+        ClassMethodReturnVendorLockResolver $classMethodReturnVendorLockResolver
+    ) {
         $this->dataProviderMethodNamesResolver = $dataProviderMethodNamesResolver;
+        $this->classMethodReturnVendorLockResolver = $classMethodReturnVendorLockResolver;
     }
 
     public function getRuleDefinition(): RuleDefinition
@@ -128,6 +137,10 @@ private function shouldSkip(ClassMethod $classMethod): bool
             return true;
         }
 
+        if ($this->classMethodReturnVendorLockResolver->isVendorLocked($classMethod)) {
+            return true;
+        }
+
         if ($classMethod->isMagic()) {
             return true;
         }

rules/dead-code/tests/Rector/ClassMethod/RemoveUnusedPublicMethodRector/Fixture/skip_required_by_contract.php.inc

@@ -0,0 +1,17 @@
+<?php
+namespace Rector\DeadCode\Tests\Rector\ClassMethod\RemoveUnusedPublicMethodRector\Fixture;
+
+use PhpParser\Node;
+use PhpParser\NodeVisitorAbstract;
+use Rector\Core\Contract\Rector\PhpRectorInterface;
+
+final class SkipRequiredByContract extends NodeVisitorAbstract implements PhpRectorInterface
+{
+    public function getNodeTypes(): array
+    {
+    }
+
+    public function refactor(Node $node): ?Node
+    {
+    }
+}