Minor improvement in convert to string template inspection: no highlighting when the expression is split onto multiple lines

idea/src/org/jetbrains/kotlin/idea/intentions/ConvertToStringTemplateIntention.kt

@@ -49,9 +49,10 @@ class ConvertToStringTemplateIntention : SelfTargetingOffsetIndependentIntention
 
     fun shouldSuggestToConvert(expression: KtBinaryExpression): Boolean {
         val entries = buildReplacement(expression).entries
-        return entries.none { it is KtBlockStringTemplateEntry } &&
-               !entries.all { it is KtLiteralStringTemplateEntry || it is KtEscapeStringTemplateEntry }
+        return entries.none { it is KtBlockStringTemplateEntry }
+               && !entries.all { it is KtLiteralStringTemplateEntry || it is KtEscapeStringTemplateEntry }
                && entries.count { it is KtLiteralStringTemplateEntry } > 1
+               && !expression.textContains('\n')
     }
 
     private fun isApplicableToNoParentCheck(expression: KtBinaryExpression): Boolean {

idea/testData/intentions/convertToStringTemplate/onMultipleLines.kt

@@ -0,0 +1,5 @@
+fun foo(p: Int) {
+    val v = <caret>"line 1\n" +
+            "line 2: " + p + "\n" +
+            "line 3"
+}

idea/testData/intentions/convertToStringTemplate/onMultipleLines.kt.after

@@ -0,0 +1,3 @@
+fun foo(p: Int) {
+    val v = "line 1\nline 2: $p\nline 3"
+}

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

@@ -4795,6 +4795,12 @@ public class IntentionTestGenerated extends AbstractIntentionTest {
             doTest(fileName);
         }
 
+        @TestMetadata("onMultipleLines.kt")
+        public void testOnMultipleLines() throws Exception {
+            String fileName = KotlinTestUtils.navigationMetadata("idea/testData/intentions/convertToStringTemplate/onMultipleLines.kt");
+            doTest(fileName);
+        }
+
         @TestMetadata("onlyForConcat.kt")
         public void testOnlyForConcat() throws Exception {
             String fileName = KotlinTestUtils.navigationMetadata("idea/testData/intentions/convertToStringTemplate/onlyForConcat.kt");