Formatter: Remove spaces before question mark in nullable types (KT-12830)

#KT-12830 Fixed

ChangeLog.md

@@ -7,6 +7,12 @@
 
 ## 1.0.4
 
+### IDE
+
+###### Issues fixed
+
+- [`KT-12830`](https://youtrack.jetbrains.com/issue/KT-12830) Remove spaces before *?* in nullable types
+
 ## 1.0.3
 
 ### Compiler

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

@@ -223,6 +223,8 @@ fun createSpacingBuilder(settings: CodeStyleSettings, builderUtil: KotlinSpacing
 
             beforeInside(INITIALIZER_LIST, ENUM_ENTRY).spaces(0)
 
+            beforeInside(QUEST, NULLABLE_TYPE).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/NullableType.after.kt

@@ -0,0 +1 @@
+fun foo(): String? = ""

idea/testData/formatter/NullableType.kt

@@ -0,0 +1 @@
+fun foo(): String  ? = ""

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

@@ -433,6 +433,12 @@ public class FormatterTestGenerated extends AbstractFormatterTest {
             doTest(fileName);
         }
 
+        @TestMetadata("NullableType.after.kt")
+        public void testNullableType() throws Exception {
+            String fileName = KotlinTestUtils.navigationMetadata("idea/testData/formatter/NullableType.after.kt");
+            doTest(fileName);
+        }
+
         @TestMetadata("ObjectInBody.after.kt")
         public void testObjectInBody() throws Exception {
             String fileName = KotlinTestUtils.navigationMetadata("idea/testData/formatter/ObjectInBody.after.kt");