Add when branches: include auto-import

Before this commit, enum / sealed class to add was not imported so
user had to import them himself. Now everything is auto-imported.
Separate "add with import" is kept but * import is now in mind there.
#KT-22330 Fixed
#KT-22354 Fixed
EA-108090 Fixed

idea/src/org/jetbrains/kotlin/idea/quickfix/AddWhenRemainingBranchesFix.kt

@@ -24,10 +24,13 @@ import org.jetbrains.kotlin.descriptors.ClassDescriptor
 import org.jetbrains.kotlin.descriptors.ClassKind
 import org.jetbrains.kotlin.diagnostics.Diagnostic
 import org.jetbrains.kotlin.idea.caches.resolve.analyze
+import org.jetbrains.kotlin.idea.core.ShortenReferences
 import org.jetbrains.kotlin.idea.core.quoteIfNeeded
 import org.jetbrains.kotlin.idea.intentions.ImportAllMembersIntention
+import org.jetbrains.kotlin.idea.refactoring.isMultiLine
 import org.jetbrains.kotlin.psi.*
 import org.jetbrains.kotlin.psi.psiUtil.getNonStrictParentOfType
+import org.jetbrains.kotlin.resolve.descriptorUtil.fqNameSafe
 import org.jetbrains.kotlin.utils.addToStdlib.firstNotNullResult
 
 class AddWhenRemainingBranchesFix(
@@ -77,16 +80,20 @@ class AddWhenRemainingBranchesFix(
             val elseBranch = element.entries.find { it.isElse }
             val psiFactory = KtPsiFactory(element)
 
+            if (missingCases.isNotEmpty() && !element.isMultiLine()) {
+                element.addBefore(psiFactory.createNewLine(), whenCloseBrace)
+            }
+
             for (case in missingCases) {
                 val branchConditionText = when (case) {
                     UnknownMissingCase, NullMissingCase, is BooleanMissingCase ->
                         case.branchConditionText
                     is ClassMissingCase ->
                         if (case.classIsSingleton) {
-                            case.classFqName.quoteIfNeeded().asString()
+                            ""
                         } else {
-                            "is " + case.classFqName.quoteIfNeeded().asString()
-                        }
+                            "is "
+                        } + case.descriptor.fqNameSafe.quoteIfNeeded().asString()
                 }
                 val entry = psiFactory.createWhenEntry("$branchConditionText -> TODO()")
                 if (elseBranch != null) {
@@ -96,6 +103,8 @@ class AddWhenRemainingBranchesFix(
                 }
             }
 
+            ShortenReferences.DEFAULT.process(element)
+
             if (withImport) {
                 importAllEntries(element)
             }

idea/testData/quickfix/when/addRemainingBranchesAnotherPackage.after.kt

@@ -0,0 +1,15 @@
+// "Add remaining branches" "true"
+
+package u
+
+import e.OwnEnum
+import e.getOwnEnum
+
+fun mainContext() {
+    val ownLocal = getOwnEnum()
+    when (ownLocal) {
+        OwnEnum.RED -> TODO()
+        OwnEnum.GREEN -> TODO()
+        OwnEnum.BLUE -> TODO()
+    }
+}

idea/testData/quickfix/when/addRemainingBranchesAnotherPackage.before.Dependency.kt

@@ -0,0 +1,5 @@
+package e
+
+enum class OwnEnum { RED, GREEN, BLUE }
+
+fun getOwnEnum(): OwnEnum = OwnEnum.RED

idea/testData/quickfix/when/addRemainingBranchesAnotherPackage.before.Main.kt

@@ -0,0 +1,10 @@
+// "Add remaining branches" "true"
+
+package u
+
+import e.getOwnEnum
+
+fun mainContext() {
+    val ownLocal = getOwnEnum()
+    <caret>when (ownLocal) {}
+}

idea/testData/quickfix/when/addRemainingBranchesAnotherPackageAll.after.kt

@@ -0,0 +1,16 @@
+// "Add remaining branches with import" "true"
+
+package u
+
+import e.OwnEnum
+import e.OwnEnum.*
+import e.getOwnEnum
+
+fun mainContext() {
+    val ownLocal = getOwnEnum()
+    when (ownLocal) {
+        RED -> TODO()
+        GREEN -> TODO()
+        BLUE -> TODO()
+    }
+}

idea/testData/quickfix/when/addRemainingBranchesAnotherPackageAll.before.Dependency.kt

@@ -0,0 +1,5 @@
+package e
+
+enum class OwnEnum { RED, GREEN, BLUE }
+
+fun getOwnEnum(): OwnEnum = OwnEnum.RED

idea/testData/quickfix/when/addRemainingBranchesAnotherPackageAll.before.Main.kt

@@ -0,0 +1,10 @@
+// "Add remaining branches with import" "true"
+
+package u
+
+import e.getOwnEnum
+
+fun mainContext() {
+    val ownLocal = getOwnEnum()
+    <caret>when (ownLocal) {}
+}

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

@@ -4203,6 +4203,16 @@ public class QuickFixMultiFileTestGenerated extends AbstractQuickFixMultiFileTes
             KotlinTestUtils.runTest(this::doTestWithExtraFile, TargetBackend.ANY, testDataFilePath);
         }
 
+        @TestMetadata("addRemainingBranchesAnotherPackage.before.Main.kt")
+        public void testAddRemainingBranchesAnotherPackage() throws Exception {
+            runTest("idea/testData/quickfix/when/addRemainingBranchesAnotherPackage.before.Main.kt");
+        }
+
+        @TestMetadata("addRemainingBranchesAnotherPackageAll.before.Main.kt")
+        public void testAddRemainingBranchesAnotherPackageAll() throws Exception {
+            runTest("idea/testData/quickfix/when/addRemainingBranchesAnotherPackageAll.before.Main.kt");
+        }
+
         public void testAllFilesPresentInWhen() throws Exception {
             KotlinTestUtils.assertAllTestsPresentByMetadata(this.getClass(), new File("idea/testData/quickfix/when"), Pattern.compile("^(\\w+)\\.((before\\.Main\\.\\w+)|(test))$"), TargetBackend.ANY, true);
         }