[DeadCode] Handle different indirect duplicated on RemoveDuplicatedCaseInSwitchRector

rules-tests/DeadCode/Rector/Switch_/RemoveDuplicatedCaseInSwitchRector/Fixture/different_indirect_duplicated.php.inc

@@ -0,0 +1,47 @@
+<?php
+
+namespace Rector\Tests\DeadCode\Rector\Switch_\RemoveDuplicatedCaseInSwitchRector\Fixture;
+
+class DiffrentIndirectDuplicated
+{
+    public function run($name)
+    {
+        switch ($name) {
+            case 'a':
+                return 'A';
+            case 'b':
+                return 'B';
+            case 'c';
+                return 'C';
+            case 'd':
+                return 'A';
+            case 'e':
+                return 'B';
+        }
+    }
+}
+
+?>
+-----
+<?php
+
+namespace Rector\Tests\DeadCode\Rector\Switch_\RemoveDuplicatedCaseInSwitchRector\Fixture;
+
+class DiffrentIndirectDuplicated
+{
+    public function run($name)
+    {
+        switch ($name) {
+            case 'a':
+            case 'd':
+                return 'A';
+            case 'b':
+            case 'e':
+                return 'B';
+            case 'c';
+                return 'C';
+        }
+    }
+}
+
+?>

rules-tests/DeadCode/Rector/Switch_/RemoveDuplicatedCaseInSwitchRector/Fixture/different_indirect_duplicated2.php.inc

@@ -0,0 +1,50 @@
+<?php
+
+namespace Rector\Tests\DeadCode\Rector\Switch_\RemoveDuplicatedCaseInSwitchRector\Fixture;
+
+class DiffrentIndirectDuplicated2
+{
+    public function run($name)
+    {
+        switch ($name) {
+            case 'a':
+                return 'A';
+            case 'b':
+                return 'B';
+            case 'c';
+                return 'C';
+            case 'f':
+                return 'C';
+            case 'd':
+                return 'A';
+            case 'e':
+                return 'B';
+        }
+    }
+}
+
+?>
+-----
+<?php
+
+namespace Rector\Tests\DeadCode\Rector\Switch_\RemoveDuplicatedCaseInSwitchRector\Fixture;
+
+class DiffrentIndirectDuplicated2
+{
+    public function run($name)
+    {
+        switch ($name) {
+            case 'a':
+            case 'd':
+                return 'A';
+            case 'b':
+            case 'e':
+                return 'B';
+            case 'c':
+            case 'f':
+                return 'C';
+        }
+    }
+}
+
+?>

rules/DeadCode/Rector/Switch_/RemoveDuplicatedCaseInSwitchRector.php

@@ -103,13 +103,14 @@ private function resolveInsertedByKeys(Switch_ $switch): array
     {
         $totalKeys = count($switch->cases);
         $insertByKeys = [];
+        $appendKey = 0;
 
         foreach ($switch->cases as $key => $case) {
             if ($case->stmts === []) {
                 continue;
             }
 
-            for ($jumpToKey = $key + 1; $jumpToKey < $totalKeys; ++$jumpToKey) {
+            for ($jumpToKey = $key + 2; $jumpToKey < $totalKeys; ++$jumpToKey) {
                 if (! isset($switch->cases[$jumpToKey])) {
                     continue;
                 }
@@ -122,10 +123,12 @@ private function resolveInsertedByKeys(Switch_ $switch): array
 
                 unset($switch->cases[$jumpToKey]);
 
-                $insertByKeys[$key][] = $nextCase;
+                $insertByKeys[$key + $appendKey][] = $nextCase;
 
                 $this->hasChanged = true;
             }
+
+            $appendKey = isset($insertByKeys[$key]) ? count($insertByKeys[$key]) : 0;
         }
 
         return $insertByKeys;
@@ -140,10 +143,16 @@ private function insertCaseByKeys(Switch_ $switch, array $insertByKeys): void
             $nextKey = $key + 1;
 
             array_splice($switch->cases, $nextKey, 0, $insertByKey);
+        }
 
-            for ($jumpToKey = $key; $jumpToKey < $key + count($insertByKey); ++$jumpToKey) {
-                $switch->cases[$jumpToKey]->stmts = [];
+        /** @var Case_|null $previousCase */
+        $previousCase = null;
+        foreach ($switch->cases as $case) {
+            if ($previousCase instanceof Case_ && $this->areSwitchStmtsEqualsAndWithBreak($case, $previousCase)) {
+                $previousCase->stmts = [];
             }
+
+            $previousCase = $case;
         }
     }