Format spaces before enum arguments

Fixes #KT-12714

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

@@ -222,6 +222,8 @@ fun createSpacingBuilder(settings: CodeStyleSettings, builderUtil: KotlinSpacing
             before(SEMICOLON).spaces(0)
             after(SEMICOLON).spaces(1)
 
+            beforeInside(INITIALIZER_LIST, ENUM_ENTRY).spaces(0)
+
             val TYPE_COLON_ELEMENTS = TokenSet.create(PROPERTY, FUN, VALUE_PARAMETER, DESTRUCTURING_DECLARATION_ENTRY, FUNCTION_LITERAL)
             beforeInside(COLON, TYPE_COLON_ELEMENTS) { spaceIf(kotlinSettings.SPACE_BEFORE_TYPE_COLON) }
             afterInside(COLON, TYPE_COLON_ELEMENTS) { spaceIf(kotlinSettings.SPACE_AFTER_TYPE_COLON) }

idea/testData/formatter/EnumArguments.after.kt

@@ -0,0 +1,5 @@
+enum class Test(val foo: Int) {
+    One(1),
+    Two(2),
+    Three(3)
+}

idea/testData/formatter/EnumArguments.kt

@@ -0,0 +1,5 @@
+enum class Test(val foo: Int) {
+    One(1),
+    Two (2),
+    Three      (3)
+}

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

@@ -253,6 +253,12 @@ public class FormatterTestGenerated extends AbstractFormatterTest {
             doTest(fileName);
         }
 
+        @TestMetadata("EnumArguments.after.kt")
+        public void testEnumArguments() throws Exception {
+            String fileName = KotlinTestUtils.navigationMetadata("idea/testData/formatter/EnumArguments.after.kt");
+            doTest(fileName);
+        }
+
         @TestMetadata("ForLineBreak.after.kt")
         public void testForLineBreak() throws Exception {
             String fileName = KotlinTestUtils.navigationMetadata("idea/testData/formatter/ForLineBreak.after.kt");