[CodeQuality] Make CommonNotEqualRector skip if not <> (#5292)

rules-tests/CodeQuality/Rector/NotEqual/CommonNotEqualRector/Fixture/skip_already.php.inc

@@ -0,0 +1,11 @@
+<?php
+
+namespace Rector\Tests\CodeQuality\Rector\NotEqual\CommonNotEqualRector\Fixture;
+
+final class SkipAlready
+{
+    public function run($one, $two)
+    {
+        return $one  !=  $two;
+    }
+}

rules/CodeQuality/Rector/NotEqual/CommonNotEqualRector.php

@@ -58,11 +58,34 @@ public function getNodeTypes(): array
     /**
      * @param NotEqual $node
      */
-    public function refactor(Node $node): NotEqual
+    public function refactor(Node $node): ?NotEqual
     {
+        if (! $this->doesNotEqualContainsShipCompareToken($node)) {
+            return null;
+        }
+
         // invoke override to default "!="
         $node->setAttribute(AttributeKey::ORIGINAL_NODE, null);
 
         return $node;
     }
+
+    private function doesNotEqualContainsShipCompareToken(NotEqual $notEqual): bool
+    {
+        $tokenStartPos = $notEqual->getStartTokenPos();
+        $tokenEndPos = $notEqual->getEndTokenPos();
+
+        for ($i = $tokenStartPos; $i < $tokenEndPos; ++$i) {
+            $token = $this->file->getOldTokens()[$i];
+            if (! isset($token[1])) {
+                continue;
+            }
+
+            if ($token[1] === '<>') {
+                return true;
+            }
+        }
+
+        return false;
+    }
 }