Keep empty bodies for declarations with comments (KT-16078)

#KT-16078 Fixed

compiler/frontend/src/org/jetbrains/kotlin/psi/psiUtil/psiUtils.kt

@@ -311,6 +311,12 @@ private fun findFirstLeafWhollyInRange(file: PsiFile, range: TextRange): PsiElem
     return if (elementRange.endOffset <= range.endOffset) element else null
 }
 
+val PsiElement.textRangeWithoutComments: TextRange
+    get() {
+        val firstNonCommentChild = children.firstOrNull { it !is PsiWhiteSpace && it !is PsiComment } ?: return textRange
+        return TextRange(firstNonCommentChild.startOffset, endOffset)
+    }
+
 // ---------------------------------- Debug/logging ----------------------------------------------------------------------------------------
 
 fun PsiElement.getElementTextWithContext(): String {

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

@@ -34,6 +34,7 @@ import org.jetbrains.kotlin.lexer.KtTokens.*
 import org.jetbrains.kotlin.psi.KtClass
 import org.jetbrains.kotlin.psi.KtFunction
 import org.jetbrains.kotlin.psi.KtPropertyAccessor
+import org.jetbrains.kotlin.psi.psiUtil.textRangeWithoutComments
 
 val MODIFIERS_LIST_ENTRIES = TokenSet.orSet(TokenSet.create(ANNOTATION_ENTRY, ANNOTATION), MODIFIER_KEYWORDS)
 
@@ -427,7 +428,7 @@ fun createSpacingBuilder(settings: CodeStyleSettings, builderUtil: KotlinSpacing
                 }
 
                 val spaces = if (empty) 0 else spacesInSimpleFunction
-                Spacing.createDependentLFSpacing(spaces, spaces, psiElement.textRange,
+                Spacing.createDependentLFSpacing(spaces, spaces, psiElement.textRangeWithoutComments,
                                                  codeStyleSettings.KEEP_LINE_BREAKS,
                                                  codeStyleSettings.KEEP_BLANK_LINES_IN_CODE)
             }
@@ -439,7 +440,7 @@ fun createSpacingBuilder(settings: CodeStyleSettings, builderUtil: KotlinSpacing
                 if (funNode.name != null) return@customRule null
 
                 // Empty block is covered in above rule
-                Spacing.createDependentLFSpacing(spacesInSimpleFunction, spacesInSimpleFunction, funNode.textRange,
+                Spacing.createDependentLFSpacing(spacesInSimpleFunction, spacesInSimpleFunction, funNode.textRangeWithoutComments,
                                                  codeStyleSettings.KEEP_LINE_BREAKS,
                                                  codeStyleSettings.KEEP_BLANK_LINES_IN_CODE)
             }

idea/testData/formatter/DocComments.after.kt

@@ -1,8 +1,7 @@
 /** Doc comment for A */
 class A {
     /** Doc comment for function */
-    fun foo() {
-    }
+    fun foo() {}
 
     /**
      * Doc comment for property

idea/testData/formatter/EmptyLineBetweenFunAndProperty.after.kt

@@ -1,6 +1,5 @@
 // No lines
-fun f1() {
-}
+fun f1() {}
 
 val p1 = 1
 fun f2() {}

idea/testData/formatter/EmptyLineBetweenFunctions.after.kt

@@ -28,8 +28,7 @@ fun f6() = 1
 fun f7() = 8
 
 // Two lines between
-fun l1() {
-}
+fun l1() {}
 
 
 fun l2() {}

idea/testData/formatter/NewLineForRBrace.after.kt

@@ -34,3 +34,15 @@ enum class E1 {
 fun e = fun(a: Int,
             b: String) {
 }
+
+/**
+ *
+ */
+fun commented1() {}
+
+/*
+ */
+fun commented2() {}
+
+// Comment
+fun commented3() {}

idea/testData/formatter/NewLineForRBrace.kt

@@ -28,3 +28,15 @@ enum class E1 {
 
 fun e = fun(a: Int,
             b: String) {}
+
+/**
+ *
+ */
+fun commented1() {}
+
+/*
+ */
+fun commented2() {}
+
+// Comment
+fun commented3() {}

idea/testData/formatter/PropertyAccessors.after.kt

@@ -21,3 +21,20 @@ class EmptyProperties {
         }
         set(value) {}
 }
+
+class EmptyProperties {
+    /**
+     *
+     */
+    var newline: String
+        /**
+         *
+         */
+        get() {
+            return ""
+        }
+        /**
+         *
+         */
+        set(value) {}
+}

idea/testData/formatter/PropertyAccessors.kt

@@ -25,3 +25,19 @@ class EmptyProperties {
         get() { return "" }
         set(value) {}
 }
+
+class EmptyProperties {
+    /**
+     *
+     */
+    var newline: String
+        /**
+         *
+         */
+        get() { return "" }
+
+        /**
+         *
+         */
+        set(value) {}
+}

idea/testData/formatter/SpacesInDeclarations.after.kt

@@ -14,8 +14,7 @@ fun fooFun2() {
 }
 
 //-----------------------
-public fun Int.extFun1() {
-}
+public fun Int.extFun1() {}
 
 public
 fun Int.extFun2() {

idea/testData/quickfix/abstract/nonMemberFunctionNoBody.kt.after

@@ -1,3 +1,2 @@
 // "Add function body" "true"
-fun foo() {
-}
+fun foo() {}

j2k/testData/fileOrElement/comments/commentsForConstructors.kt

@@ -7,8 +7,7 @@ internal class A// this is a primary constructor
     } // end of primary constructor body
 
     // this is a secondary constructor 2
-    constructor(s: String) : this(s.length) {
-    } // end of secondary constructor 2 body
+    constructor(s: String) : this(s.length) {} // end of secondary constructor 2 body
 }// this is a secondary constructor 1
 // end of secondary constructor 1 body
 

j2k/testData/fileOrElement/issues/comments.kt

@@ -25,16 +25,14 @@ internal class C {
     }
 
     //simple one line comment for function
-    fun f1() {
-    }
+    fun f1() {}
 
     //simple one line comment for field
     var j: Int = 0
 
     //double c style
     //comment before function
-    fun f2() {
-    }
+    fun f2() {}
 
     //double c style
     //comment before field
@@ -48,8 +46,7 @@ internal class C {
      * different
      */
     //comments
-    fun f3() {
-    }
+    fun f3() {}
 
     //combination
     /** of