ComplexRedundantLetInspection: fix highlight for multiple line receiver

#KT-31278 Fixed

idea/src/org/jetbrains/kotlin/idea/inspections/RedundantLetInspection.kt

@@ -224,12 +224,12 @@ private fun KtFunctionLiteral.valueParameterReferences(callExpression: KtCallExp
 
 private fun isSingleLine(element: KtCallExpression): Boolean {
     val qualifiedExpression = element.getQualifiedExpressionForSelector() ?: return true
-    var receiver = qualifiedExpression.receiverExpression as? KtQualifiedExpression ?: return true
+    var receiver = qualifiedExpression.receiverExpression
     if (receiver.lineCount() > 1) return false
     var count = 1
     while (true) {
         if (count > 2) return false
-        receiver = receiver.receiverExpression as? KtQualifiedExpression ?: break
+        receiver = (receiver  as? KtQualifiedExpression)?.receiverExpression ?: break
         count++
     }
     return true

idea/testData/inspectionsLocal/complexRedundantLet/multipleLines.kt

@@ -0,0 +1,8 @@
+// WITH_RUNTIME
+// HIGHLIGHT: INFORMATION
+
+fun test() {
+    runCatching {
+        /* lots of code*/
+    }.let<caret> { println(it) }
+}

idea/testData/inspectionsLocal/complexRedundantLet/multipleLines.kt.after

@@ -0,0 +1,8 @@
+// WITH_RUNTIME
+// HIGHLIGHT: INFORMATION
+
+fun test() {
+    println(runCatching {
+        /* lots of code*/
+    })
+}

idea/tests/org/jetbrains/kotlin/idea/inspections/LocalInspectionTestGenerated.java

@@ -2313,6 +2313,11 @@ public class LocalInspectionTestGenerated extends AbstractLocalInspectionTest {
             runTest("idea/testData/inspectionsLocal/complexRedundantLet/longCallChain.kt");
         }
 
+        @TestMetadata("multipleLines.kt")
+        public void testMultipleLines() throws Exception {
+            runTest("idea/testData/inspectionsLocal/complexRedundantLet/multipleLines.kt");
+        }
+
         @TestMetadata("multipleReceiver.kt")
         public void testMultipleReceiver() throws Exception {
             runTest("idea/testData/inspectionsLocal/complexRedundantLet/multipleReceiver.kt");