Don't add a blank line between one line class and object (KT-10965)

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

@@ -54,6 +54,9 @@ fun createSpacingBuilder(settings: CodeStyleSettings): KotlinSpacingBuilder {
 
         custom {
             inPosition(left = CLASS, right = CLASS).emptyLinesIfLineBreakInLeft(1)
+            inPosition(left = CLASS, right = OBJECT_DECLARATION).emptyLinesIfLineBreakInLeft(1)
+            inPosition(left = OBJECT_DECLARATION, right = OBJECT_DECLARATION).emptyLinesIfLineBreakInLeft(1)
+            inPosition(left = OBJECT_DECLARATION, right = CLASS).emptyLinesIfLineBreakInLeft(1)
             inPosition(left = FUN, right = FUN).emptyLinesIfLineBreakInLeft(1)
             inPosition(left = PROPERTY, right = FUN).emptyLinesIfLineBreakInLeft(1)
             inPosition(left = FUN, right = PROPERTY).emptyLinesIfLineBreakInLeft(1)
@@ -95,7 +98,7 @@ fun createSpacingBuilder(settings: CodeStyleSettings): KotlinSpacingBuilder {
             before(DOC_COMMENT).lineBreakInCode()
             between(PROPERTY, PROPERTY).lineBreakInCode()
 
-            // CLASS - CLASS is exception
+            // CLASS - CLASS, CLASS - OBJECT_DECLARATION are exception
             between(CLASS, DECLARATIONS).blankLines(1)
 
             // FUN - FUN, FUN - PROPERTY, FUN - CLASS are exceptions
@@ -104,6 +107,7 @@ fun createSpacingBuilder(settings: CodeStyleSettings): KotlinSpacingBuilder {
             // PROPERTY - PROPERTY, PROPERTY - FUN are exceptions
             between(PROPERTY, DECLARATIONS).blankLines(1)
 
+            // OBJECT_DECLARATION - OBJECT_DECLARATION, CLASS - OBJECT_DECLARATION are exception
             between(OBJECT_DECLARATION, DECLARATIONS).blankLines(1)
             between(SECONDARY_CONSTRUCTOR, DECLARATIONS).blankLines(1)
             between(CLASS_INITIALIZER, DECLARATIONS).blankLines(1)

idea/testData/formatter/EmptyLineAfterObjectDeclaration.after.kt

@@ -1,7 +1,12 @@
 object O1
-
 object O2
 
+// -----
+object O1M {
+}
+
+object O2M
+
 // -----
 
 object O3
@@ -17,17 +22,29 @@ val p1 = 1
 // -----
 
 object O5
-
 class C1
 
 // -----
 
-object O6
+object O5M {
+}
 
+class C1M
+
+// -----
+
+object O6
 interface T1
 
 // -----
 
+object O6M {
+}
+
+interface T1M
+
+// -----
+
 enum class E1 {
     ENTRY;
 
@@ -37,6 +54,12 @@ enum class E1 {
 // -----
 
 object O8 {}
+object O9
+
+// -----
+
+object O8 {
+}
 
 object O9
 
@@ -55,12 +78,24 @@ val p2 = 1
 // -----
 
 object O12 {}
-
 class C2
 
 // -----
 
+object O12M {
+}
+
+class C2M
+
+// -----
+
 object O13 {}
+interface T2
+
+// -----
+
+object O14 {
+}
 
 interface T2
 
@@ -115,3 +150,19 @@ enum class E3 {
     object O21 {
     }
 }
+
+// -----
+
+sealed class C4 {
+    class C5 : C4()
+    object O22 : C4()
+}
+
+// -----
+
+sealed class C6 {
+    class C7 : C6() {
+    }
+
+    object O23 : C6()
+}

idea/testData/formatter/EmptyLineAfterObjectDeclaration.kt

@@ -1,6 +1,11 @@
 object O1
 object O2
 
+// -----
+object O1M {
+}
+object O2M
+
 // -----
 
 object O3
@@ -18,11 +23,23 @@ class C1
 
 // -----
 
+object O5M {
+}
+class C1M
+
+// -----
+
 object O6
 interface T1
 
 // -----
 
+object O6M {
+}
+interface T1M
+
+// -----
+
 enum class E1 {
     ENTRY;
     object O7
@@ -35,6 +52,12 @@ object O9
 
 // -----
 
+object O8 {
+}
+object O9
+
+// -----
+
 object O10 {}
 fun f2() = 1
 
@@ -50,11 +73,23 @@ class C2
 
 // -----
 
+object O12M {
+}
+class C2M
+
+// -----
+
 object O13 {}
 interface T2
 
 // -----
 
+object O14 {
+}
+interface T2
+
+// -----
+
 enum class E2 {
     ENTRY;
     object O14 {}
@@ -97,3 +132,18 @@ enum class E3 {
     object O21 {
     }
 }
+
+// -----
+
+sealed class C4 {
+    class C5 : C4()
+    object O22 : C4()
+}
+
+// -----
+
+sealed class C6 {
+    class C7 : C6() {
+    }
+    object O23 : C6()
+}