Cannot transform to flatMap if old working variable used in the nested loop

idea/testData/intentions/loopToCallChain/flatMap_workingVarStillNeeded.kt

@@ -0,0 +1,10 @@
+// WITH_RUNTIME
+// IS_APPLICABLE: false
+fun foo(list: List<String>): String? {
+    <caret>for (s in list) {
+        for (line in s.lines()) {
+            if (line.isNotBlank() && line.length < s.length / 10) return line
+        }
+    }
+    return null
+}