Formatter: fix line break between declarations with annotations

#KT-35093 Fixed
#KT-35106 Fixed

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

@@ -105,8 +105,7 @@ class KotlinSpacingBuilder(val commonCodeStyleSettings: CommonCodeStyleSettings,
                 val leftEndsWithComment = lastChild is PsiComment && lastChild.tokenType == KtTokens.EOL_COMMENT
                 val dependentSpacingRule = DependentSpacingRule(Trigger.HAS_LINE_FEEDS).registerData(Anchor.MIN_LINE_FEEDS, emptyLines + 1)
                 val textRange = left.node
-                    ?.children()
-                    ?.firstOrNull { it.elementType !in KtTokens.WHITE_SPACE_OR_COMMENT_BIT_SET }
+                    ?.startOfDeclaration()
                     ?.startOffset
                     ?.let { TextRange.create(it, left.textRange.endOffset) }
                     ?: left.textRange

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

@@ -95,9 +95,9 @@ fun createSpacingBuilder(settings: CodeStyleSettings, builderUtil: KotlinSpacing
                 _: ASTBlock,
                 right: ASTBlock
             ): Spacing? {
-                val firstChild = right.node?.firstChildNode as? PsiComment ?: return null
-                val whiteSpace = firstChild.nextSibling as? PsiWhiteSpace ?: return null
-                return if (StringUtil.containsLineBreak(firstChild.text) || StringUtil.containsLineBreak(whiteSpace.text)) {
+                val node = right.node ?: return null
+                val elementStart = node.startOfDeclaration() ?: return null
+                return if (StringUtil.containsLineBreak(node.text.subSequence(0, elementStart.startOffset - node.startOffset).trimStart())) {
                     createSpacing(0, minLineFeeds = 2)
                 } else
                     null

idea/testData/formatter/EmptyLineBetweeAbstractFunctions.after.kt

@@ -13,6 +13,10 @@ interface Some {
      */
     fun f6()
     fun f7()
+
+    @NotNull
+    fun f8()
+    fun f9()
 }
 
 abstract class Abstract() {

idea/testData/formatter/EmptyLineBetweeAbstractFunctions.kt

@@ -11,6 +11,9 @@ interface Some {
      */
     fun f6()
     fun f7()
+    @NotNull
+    fun f8()
+    fun f9()
 }
 
 abstract class Abstract() {

idea/testData/multiModuleQuickFix/createExpect/withAnnotations/header/My.kt.after

@@ -4,6 +4,7 @@
 annotation class CommonAnnotation
 expect class My {
     tailrec fun foo(arg: Int): Int
+
     @CommonAnnotation
     fun initialize()
 

nj2k/testData/newJ2k/annotations/annotationArrayArgument.kt

@@ -3,6 +3,7 @@ import kotlin.reflect.KClass
 annotation class Ann(vararg val value: Inner, val test1: Array<InnerParam> = [InnerParam(C::class)])
 annotation class Inner
 annotation class InnerParam(val value: KClass<*>)
+
 @Ann(value = [Inner(), Inner()], test1 = [InnerParam(C::class)])
 class C
 

nj2k/testData/newJ2k/annotations/annotationInterface2.kt

@@ -1,3 +1,4 @@
 internal annotation class Anon(val s: String = "a", val stringArray: Array<String> = ["a", "b"], val intArray: IntArray)
+
 @Anon(intArray = [1, 2])
 internal class A

nj2k/testData/newJ2k/annotations/annotationInterface4.kt

@@ -1,4 +1,5 @@
 internal annotation class Anon(vararg val value: String, val x: Int = 1)
+
 @Anon("a", "b")
 internal interface I1
 

nj2k/testData/newJ2k/annotations/annotationUsages.kt

@@ -23,10 +23,13 @@ internal class C {
     @Anon5(1)
     @Deprecated("")
     private val field1 = 0
+
     @Anon5(1)
     private val field2 = 0
+
     @Anon5(1)
     var field3 = 0
+
     @Anon5(1)
     var field4 = 0
 

nj2k/testData/newJ2k/annotations/javaClassArgument.kt

@@ -1,5 +1,6 @@
 import kotlin.reflect.KClass
 
 internal annotation class Ann(val value: KClass<*>, val other: KClass<*>)
+
 @Ann(other = String::class, value = Any::class)
 internal class C 

nj2k/testData/newJ2k/annotations/javaClassArrayArgument.kt

@@ -1,6 +1,7 @@
 import kotlin.reflect.KClass
 
 internal annotation class Ann(vararg val value: KClass<*>)
+
 @Ann(String::class, Any::class)
 internal class C
 

nj2k/testData/newJ2k/constructors/secondaryConstructorWithDefaultValues.kt

@@ -3,6 +3,7 @@ internal class A {
     private var x = 0
 
     constructor() {}
+
     @JvmOverloads
     constructor(p: Int, s: String, x: Int = 1) {
         this.s = s

nj2k/testData/newJ2k/field/volatileTransientAndStrictFp.kt

@@ -3,6 +3,7 @@ internal class A {
     @Deprecated("")
     @Volatile
     var field1 = 0
+
     @Transient
     var field2 = 1
 

nj2k/testData/newJ2k/issues/kt-21189.kt

@@ -1,5 +1,6 @@
 object ArrayInitializerBugKt {
     private val GREETING = byteArrayOf('H'.toByte(), 'e'.toByte(), 'l'.toByte(), 'l'.toByte(), 'o'.toByte(), ','.toByte(), ' '.toByte(), 'b'.toByte(), 'u'.toByte(), 'g'.toByte(), '!'.toByte())
+
     @JvmStatic
     fun main(args: Array<String>) {
         val greeting = String(GREETING)