IDEA-110978 Refactors this as null when converting for-each loop to indexed for loop

plugins/IntentionPowerPak/src/com/siyeh/ipp/forloop/ReplaceForEachLoopWithIndexedForLoopIntention.java

@@ -216,7 +216,7 @@ public class ReplaceForEachLoopWithIndexedForLoopIntention extends Intention {
       }
       return createVariable(variableName, expression, context);
     }
-    return null;
+    return expression.getText();
   }
 
   private static String createVariable(String variableNameRoot,

plugins/IntentionPowerPak/test/com/siyeh/ipp/forloop/indexed/ThisExpr.java

@@ -0,0 +1,9 @@
+package com.siyeh.ipp.forloop.indexed;
+import java.util.*;
+class NormalForEachLoop implements List<Integer>{
+    void foo() {
+        <caret>for (Integer i : this) {
+            System.out.println(i);
+        }
+    }
+}

plugins/IntentionPowerPak/test/com/siyeh/ipp/forloop/indexed/ThisExpr_after.java

@@ -0,0 +1,10 @@
+package com.siyeh.ipp.forloop.indexed;
+import java.util.*;
+class NormalForEachLoop implements List<Integer>{
+    void foo() {
+        for (int i1 = 0, thisSize = this.size(); i1 < thisSize; i1++) {
+            Integer i = this.get(i1);
+            System.out.println(i);
+        }
+    }
+}

plugins/IntentionPowerPak/testSrc/com/siyeh/ipp/forloop/ReplaceForEachLoopWithIndexedForLoopIntentionTest.java

@@ -21,6 +21,7 @@ import com.siyeh.ipp.IPPTestCase;
 public class ReplaceForEachLoopWithIndexedForLoopIntentionTest extends IPPTestCase {
   public void testLabeledForLoop() { doTest(); }
   public void testNormalForeachLoop() { doTest(); }
+  public void testThisExpr() { doTest(); }
   public void testNewArray() { doTest(); }
 
   @Override