Option for normal indent in supertype lists

#KT-21527 Fixed

idea/formatter/src/org/jetbrains/kotlin/idea/core/formatter/KotlinCodeStyleSettings.java

@@ -43,6 +43,7 @@ public class KotlinCodeStyleSettings extends CustomCodeStyleSettings {
     public boolean CONTINUATION_INDENT_IN_PARAMETER_LISTS = true;
     public boolean CONTINUATION_INDENT_FOR_EXPRESSION_BODIES = true;
     public boolean CONTINUATION_INDENT_FOR_CHAINED_CALLS = true;
+    public boolean CONTINUATION_INDENT_IN_SUPERTYPE_LISTS = true;
     public int BLANK_LINES_AROUND_BLOCK_WHEN_BRANCHES = 0;
 
     public KotlinCodeStyleSettings(CodeStyleSettings container) {

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

@@ -494,7 +494,12 @@ private val INDENT_RULES = arrayOf<NodeIndentStrategy>(
 
         strategy("Delegation list")
                 .within(KtNodeTypes.SUPER_TYPE_LIST, KtNodeTypes.INITIALIZER_LIST)
-                .set(Indent.getContinuationIndent(false)),
+                .set { settings ->
+                    if (settings.kotlinSettings.CONTINUATION_INDENT_IN_SUPERTYPE_LISTS)
+                        Indent.getContinuationIndent(false)
+                    else
+                        Indent.getNormalIndent()
+                },
 
         strategy("Indices")
                 .within(KtNodeTypes.INDICES)

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

@@ -258,6 +258,11 @@ class KotlinLanguageCodeStyleSettingsProvider : LanguageCodeStyleSettingsProvide
                 showCustomOption(KotlinCodeStyleSettings::LBRACE_ON_NEXT_LINE,
                                 "Put left brace on new line",
                                  CodeStyleSettingsCustomizable.WRAPPING_BRACES)
+
+                showCustomOption(
+                        KotlinCodeStyleSettings::CONTINUATION_INDENT_IN_SUPERTYPE_LISTS,
+                        "Use continuation indent",
+                        CodeStyleSettingsCustomizable.WRAPPING_EXTENDS_LIST)
             }
             LanguageCodeStyleSettingsProvider.SettingsType.BLANK_LINES_SETTINGS -> {
                 consumer.showStandardOptions(

idea/testData/formatter/ContinuationIndentInSupertypeLists.after.kt

@@ -0,0 +1,5 @@
+class Foo :
+        Bar,
+        Baz
+
+// SET_TRUE: CONTINUATION_INDENT_IN_SUPERTYPE_LISTS

idea/testData/formatter/ContinuationIndentInSupertypeLists.inv.kt

@@ -0,0 +1,5 @@
+class Foo :
+    Bar,
+    Baz
+
+// SET_TRUE: CONTINUATION_INDENT_IN_SUPERTYPE_LISTS

idea/testData/formatter/ContinuationIndentInSupertypeLists.kt

@@ -0,0 +1,5 @@
+class Foo :
+Bar,
+Baz
+
+// SET_TRUE: CONTINUATION_INDENT_IN_SUPERTYPE_LISTS

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

@@ -218,6 +218,12 @@ public class FormatterTestGenerated extends AbstractFormatterTest {
             doTest(fileName);
         }
 
+        @TestMetadata("ContinuationIndentInSupertypeLists.after.kt")
+        public void testContinuationIndentInSupertypeLists() throws Exception {
+            String fileName = KotlinTestUtils.navigationMetadata("idea/testData/formatter/ContinuationIndentInSupertypeLists.after.kt");
+            doTest(fileName);
+        }
+
         @TestMetadata("CurlyBraceStringInterpolation.after.kt")
         public void testCurlyBraceStringInterpolation() throws Exception {
             String fileName = KotlinTestUtils.navigationMetadata("idea/testData/formatter/CurlyBraceStringInterpolation.after.kt");