KT-9450 «Replace overloaded operator with function call» breaks code for index access result saved to variable

#KT-9450 Fixed

idea/idea-analysis/src/org/jetbrains/kotlin/idea/intentions/OperatorToFunctionIntention.kt

@@ -168,7 +168,7 @@ public class OperatorToFunctionIntention : JetSelfTargetingIntention<KtExpressio
 
             val transformation : String
             val replaced : KtElement
-            if (parent is KtBinaryExpression && parent.getOperationReference().getReferencedNameElementType() == KtTokens.EQ) {
+            if (parent is KtBinaryExpression && parent.getOperationReference().getReferencedNameElementType() == KtTokens.EQ && element == parent.left) {
                 // part of an assignment
                 val right = parent.getRight()!!.getText()
                 transformation = "$array.set($indicesText, $right)"

idea/testData/intentions/operatorToFunction/inRightSideOfAssignment.kt

@@ -0,0 +1,4 @@
+fun foo(map: Map<String, String>) {
+    val a: String?
+    a = map<caret>[""]
+}

idea/testData/intentions/operatorToFunction/inRightSideOfAssignment.kt.after

@@ -0,0 +1,4 @@
+fun foo(map: Map<String, String>) {
+    val a: String?
+    a = map.get("")
+}

idea/tests/org/jetbrains/kotlin/idea/intentions/IntentionTestGenerated.java

@@ -5919,6 +5919,12 @@ public class IntentionTestGenerated extends AbstractIntentionTest {
             doTest(fileName);
         }
 
+        @TestMetadata("inRightSideOfAssignment.kt")
+        public void testInRightSideOfAssignment() throws Exception {
+            String fileName = JetTestUtils.navigationMetadata("idea/testData/intentions/operatorToFunction/inRightSideOfAssignment.kt");
+            doTest(fileName);
+        }
+
         @TestMetadata("notApplicableAssignment.kt")
         public void testNotApplicableAssignment() throws Exception {
             String fileName = JetTestUtils.navigationMetadata("idea/testData/intentions/operatorToFunction/notApplicableAssignment.kt");