"Create enum constant" quick fix: do not add redundant empty line

#KT-32981 Fixed

idea/src/org/jetbrains/kotlin/idea/quickfix/createFromUsage/callableBuilder/CallableBuilder.kt

@@ -79,6 +79,7 @@ import org.jetbrains.kotlin.types.checker.KotlinTypeChecker
 import org.jetbrains.kotlin.types.typeUtil.isAnyOrNullableAny
 import org.jetbrains.kotlin.types.typeUtil.isUnit
 import org.jetbrains.kotlin.types.typeUtil.makeNullable
+import org.jetbrains.kotlin.utils.addToStdlib.firstIsInstanceOrNull
 import java.util.*
 import kotlin.math.max
 
@@ -1145,13 +1146,22 @@ internal fun <D : KtNamedDeclaration> placeDeclarationInContainer(
         else -> throw AssertionError("Invalid containing element: ${container.text}")
     }
 
-    if (declaration !is KtPrimaryConstructor) {
-        val parent = declarationInPlace.parent
-        calcNecessaryEmptyLines(declarationInPlace, false).let {
-            if (it > 0) parent.addBefore(psiFactory.createNewLine(it), declarationInPlace)
+    when (declaration) {
+        is KtEnumEntry -> {
+            val prevEnumEntry = declarationInPlace.siblings(forward = false, withItself = false).firstIsInstanceOrNull<KtEnumEntry>()
+            if ((prevEnumEntry?.prevSibling as? PsiWhiteSpace)?.text?.contains('\n') == true) {
+                val parent = declarationInPlace.parent
+                parent.addBefore(psiFactory.createNewLine(), declarationInPlace)
+            }
         }
-        calcNecessaryEmptyLines(declarationInPlace, true).let {
-            if (it > 0) parent.addAfter(psiFactory.createNewLine(it), declarationInPlace)
+        !is KtPrimaryConstructor -> {
+            val parent = declarationInPlace.parent
+            calcNecessaryEmptyLines(declarationInPlace, false).let {
+                if (it > 0) parent.addBefore(psiFactory.createNewLine(it), declarationInPlace)
+            }
+            calcNecessaryEmptyLines(declarationInPlace, true).let {
+                if (it > 0) parent.addAfter(psiFactory.createNewLine(it), declarationInPlace)
+            }
         }
     }
     return declarationInPlace

idea/testData/quickfix/createFromUsage/createClass/referenceExpression/enumEntryAddComma.kt.after

@@ -1,7 +1,6 @@
 // "Create enum constant 'PUBLIC'" "true"
 enum class TopicState {
     PRIVATE,
-
     <caret>PUBLIC
 }
 

idea/testData/quickfix/createFromUsage/createClass/referenceExpression/enumEntryHasComma.kt.after

@@ -1,7 +1,6 @@
 // "Create enum constant 'PUBLIC'" "true"
 enum class TopicState {
     PRIVATE,
-
     <caret>PUBLIC
 }
 

idea/testData/quickfix/createFromUsage/createClass/referenceExpression/enumEntryHasNoLineBreak.kt

@@ -0,0 +1,8 @@
+// "Create enum constant 'C'" "true"
+enum class E {
+    A, B
+}
+
+fun foo() {
+    E.<caret>C
+}

idea/testData/quickfix/createFromUsage/createClass/referenceExpression/enumEntryHasNoLineBreak.kt.after

@@ -0,0 +1,8 @@
+// "Create enum constant 'C'" "true"
+enum class E {
+    A, B, <caret>C
+}
+
+fun foo() {
+    E.C
+}

idea/tests/org/jetbrains/kotlin/idea/quickfix/QuickFixTestGenerated.java

@@ -3290,6 +3290,11 @@ public class QuickFixTestGenerated extends AbstractQuickFixTest {
                     runTest("idea/testData/quickfix/createFromUsage/createClass/referenceExpression/enumEntryHasComma.kt");
                 }
 
+                @TestMetadata("enumEntryHasNoLineBreak.kt")
+                public void testEnumEntryHasNoLineBreak() throws Exception {
+                    runTest("idea/testData/quickfix/createFromUsage/createClass/referenceExpression/enumEntryHasNoLineBreak.kt");
+                }
+
                 @TestMetadata("enumEntryNoReceiver.kt")
                 public void testEnumEntryNoReceiver() throws Exception {
                     runTest("idea/testData/quickfix/createFromUsage/createClass/referenceExpression/enumEntryNoReceiver.kt");