PY-9176 Converting % to format() doesn't handle multiline string literals

python/src/com/jetbrains/python/codeInsight/intentions/ConvertFormatOperatorToMethodIntention.java

@@ -290,7 +290,10 @@ public class ConvertFormatOperatorToMethodIntention extends BaseIntentionAction
       }
     }
     else target.append("(").append(paramText).append(")"); // tuple is ok as is
-    element.replace(elementGenerator.createExpressionFromText(LanguageLevel.forElement(element), target.toString()));
+    // Correctly handle multiline implicitly concatenated string literals (PY-9176)
+    target.insert(0, '(').append(')');
+    final PyExpression parenthesized = elementGenerator.createExpressionFromText(LanguageLevel.forElement(element), target.toString());
+    element.replace(sure(((PyParenthesizedExpression)parenthesized).getContainedExpression()));
   }
 
   private static String getSeparator(PyStringLiteralExpression leftExpression) {

python/testData/intentions/PyConvertFormatOperatorToMethodIntentionTest/concatenated.py

@@ -0,0 +1,2 @@
+print('<caret>%(quantity)s pounds of '
+      '%(type)s' % dict(quantity=42, type='spam'))

python/testData/intentions/PyConvertFormatOperatorToMethodIntentionTest/concatenated_after.py

@@ -0,0 +1,2 @@
+print('{quantity:s} pounds of '
+      '{type:s}'.format(quantity=42, type='spam'))

python/testSrc/com/jetbrains/python/intentions/PyConvertFormatOperatorToMethodIntentionTest.java

@@ -38,4 +38,9 @@ public class PyConvertFormatOperatorToMethodIntentionTest extends PyIntentionTes
   public void testUnicode() {
     doTest(PyBundle.message("INTN.replace.with.method"), LanguageLevel.PYTHON26);
   }
+
+  // PY-9176
+  public void testConcatenated() {
+    doTest(PyBundle.message("INTN.replace.with.method"), LanguageLevel.PYTHON26);
+  }
 }