Introduce variable does something really strange for expression in square brackets

#KT-2490 Fixed

idea/src/org/jetbrains/jet/plugin/refactoring/introduceVariable/JetIntroduceVariableHandler.java

@@ -526,6 +526,9 @@ public class JetIntroduceVariableHandler extends JetIntroduceHandlerBase {
                  ((JetLoopExpression)parent.getParent()).getBody() != place) {
             return true;
         }
+        else if (parent.getParent() instanceof JetArrayAccessExpression) {
+            return true;
+        }
         return false;
     }
 

idea/testData/refactoring/introduceVariable/ArrayAccessExpr.kt

@@ -0,0 +1,9 @@
+fun f(list: List<String>) {
+    val value = list[<selection>1 + 2</selection>]
+}
+/*
+fun f(list: List<String>) {
+    val i = 1 + 2
+    val value = list[i]
+}
+*/

idea/tests/org/jetbrains/jet/plugin/refactoring/introduceVariable/JetIntroduceVariableTest.java

@@ -137,6 +137,10 @@ public class JetIntroduceVariableTest extends LightCodeInsightFixtureTestCase {
         doTest();
     }
 
+    public void testArrayAccessExpr() {
+        doTest();
+    }
+
     @Override
     protected void setUp() throws Exception {
         super.setUp();