"Join lines" works incorrectly in case of line containing more than one string literal (KT-22374)

#KT-22374 Fixed

idea/src/org/jetbrains/kotlin/idea/joinLines/JoinToStringTemplateHandler.kt

@@ -49,7 +49,9 @@ class JoinToStringTemplateHandler : JoinRawLinesHandlerDelegate {
 
         var rightText = ConvertToStringTemplateIntention.buildText(binaryExpr.right, false)
         var left = binaryExpr.left
-        while (left is KtBinaryExpression && left.joinable() && left.parent.getLineCount() >= lineCount) {
+        while (left is KtBinaryExpression && left.joinable()) {
+            val leftLeft = (left as? KtBinaryExpression)?.left ?: break
+            if (leftLeft.lineCount() < lineCount) break
             rightText = ConvertToStringTemplateIntention.buildText(left.right, false) + rightText
             left = left.left
         }

idea/testData/joinLines/stringTemplate/threeLines2.kt

@@ -0,0 +1,5 @@
+fun test() {
+    val s = "1" +
+            "2" +<caret>
+            "3"
+}

idea/testData/joinLines/stringTemplate/threeLines2.kt.after

@@ -0,0 +1,4 @@
+fun test() {
+    val s = "1" +
+            "2<caret>3"
+}

idea/tests/org/jetbrains/kotlin/idea/intentions/declarations/JoinLinesTestGenerated.java

@@ -458,5 +458,11 @@ public class JoinLinesTestGenerated extends AbstractJoinLinesTest {
             String fileName = KotlinTestUtils.navigationMetadata("idea/testData/joinLines/stringTemplate/threeLines.kt");
             doTest(fileName);
         }
+
+        @TestMetadata("threeLines2.kt")
+        public void testThreeLines2() throws Exception {
+            String fileName = KotlinTestUtils.navigationMetadata("idea/testData/joinLines/stringTemplate/threeLines2.kt");
+            doTest(fileName);
+        }
     }
 }