Indent default parameter values

#KT-22508 Fixed

idea/formatter/src/org/jetbrains/kotlin/idea/formatter/KotlinCommonBlock.kt

@@ -790,7 +790,12 @@ private val INDENT_RULES = arrayOf(
             KtTokens.TYPE_ALIAS_KEYWORD, KtTokens.EOL_COMMENT, KtNodeTypes.MODIFIER_LIST, KtTokens.BLOCK_COMMENT,
             KtTokens.DOC_COMMENT
         )
-        .set(Indent.getContinuationIndent())
+        .set(Indent.getContinuationIndent()),
+
+    strategy("Default parameter values")
+        .within(KtNodeTypes.VALUE_PARAMETER)
+        .forElement { node -> node.psi != null && node.psi == (node.psi.parent as? KtParameter)?.defaultValue }
+        .continuationIf(KotlinCodeStyleSettings::CONTINUATION_INDENT_FOR_EXPRESSION_BODIES, indentFirst = true)
 )
 
 

idea/testData/formatter/parameterList/DefaultParameterValues.after.inv.kt

@@ -0,0 +1,12 @@
+fun foo(
+        x: Int =
+            42
+) {
+}
+
+class C(
+        val x: Int =
+            42
+)
+
+// SET_TRUE: CONTINUATION_INDENT_FOR_EXPRESSION_BODIES

idea/testData/formatter/parameterList/DefaultParameterValues.after.kt

@@ -0,0 +1,12 @@
+fun foo(
+        x: Int =
+                42
+) {
+}
+
+class C(
+        val x: Int =
+                42
+)
+
+// SET_TRUE: CONTINUATION_INDENT_FOR_EXPRESSION_BODIES

idea/testData/formatter/parameterList/DefaultParameterValues.kt

@@ -0,0 +1,12 @@
+fun foo(
+    x: Int =
+    42
+) {
+}
+
+class C(
+    val x: Int =
+    42
+)
+
+// SET_TRUE: CONTINUATION_INDENT_FOR_EXPRESSION_BODIES

idea/tests/org/jetbrains/kotlin/formatter/FormatterTestGenerated.java

@@ -1184,6 +1184,12 @@ public class FormatterTestGenerated extends AbstractFormatterTest {
                 doTest(fileName);
             }
 
+            @TestMetadata("DefaultParameterValues.after.kt")
+            public void testDefaultParameterValues() throws Exception {
+                String fileName = KotlinTestUtils.navigationMetadata("idea/testData/formatter/parameterList/DefaultParameterValues.after.kt");
+                doTest(fileName);
+            }
+
             @TestMetadata("KT19727.after.kt")
             public void testKT19727() throws Exception {
                 String fileName = KotlinTestUtils.navigationMetadata("idea/testData/formatter/parameterList/KT19727.after.kt");
@@ -1544,5 +1550,20 @@ public class FormatterTestGenerated extends AbstractFormatterTest {
                 doTestInverted(fileName);
             }
         }
+
+        @TestMetadata("idea/testData/formatter/parameterList")
+        @TestDataPath("$PROJECT_ROOT")
+        @RunWith(JUnit3RunnerWithInners.class)
+        public static class ParameterList extends AbstractFormatterTest {
+            public void testAllFilesPresentInParameterList() throws Exception {
+                KotlinTestUtils.assertAllTestsPresentByMetadata(this.getClass(), new File("idea/testData/formatter/parameterList"), Pattern.compile("^([^\\.]+)\\.after\\.inv\\.kt.*$"), TargetBackend.ANY, true);
+            }
+
+            @TestMetadata("DefaultParameterValues.after.inv.kt")
+            public void testDefaultParameterValues() throws Exception {
+                String fileName = KotlinTestUtils.navigationMetadata("idea/testData/formatter/parameterList/DefaultParameterValues.after.inv.kt");
+                doTestInverted(fileName);
+            }
+        }
     }
 }