Don't create unbalanced trivia when moving types.

src/EditorFeatures/CSharpTest/CodeActions/MoveType/MoveTypeTests.MoveToNewFile.cs

@@ -944,5 +944,57 @@ class Inner : IWhatever {
             await TestMoveTypeToNewFileAsync(
                 code, codeAfterMove, expectedDocumentName, destinationDocumentText);
         }
+
+        [WorkItem(17930, "https://github.com/dotnet/roslyn/issues/17930")]
+        [WpfFact, Trait(Traits.Feature, Traits.Features.CodeActionsMoveType)]
+        public async Task MoveTypeWithDirectives1()
+        {
+            var code =
+@"using System;
+
+namespace N
+{
+    class Program
+    {
+        static void Main()
+        {
+        }
+    }
+}
+
+#if true
+public class [||]Inner
+{
+
+}
+#endif";
+var codeAfterMove =
+@"using System;
+
+namespace N
+{
+    class Program
+    {
+        static void Main()
+        {
+        }
+    }
+}
+
+#if true
+#endif";
+
+            var expectedDocumentName = "Inner.cs";
+            var destinationDocumentText =
+@"#if true
+public class Inner
+{
+
+}
+#endif";
+
+            await TestMoveTypeToNewFileAsync(
+                code, codeAfterMove, expectedDocumentName, destinationDocumentText, ignoreTrivia: false);
+        }
     }
 }
\ No newline at end of file

src/Features/Core/Portable/CodeFixes/Async/AbstractAddAwaitCodeFixProvider.cs

@@ -5,6 +5,7 @@
 using System.Threading;
 using System.Threading.Tasks;
 using Microsoft.CodeAnalysis.CodeActions;
+using Microsoft.CodeAnalysis.Shared.Extensions;
 
 namespace Microsoft.CodeAnalysis.CodeFixes.Async
 {
@@ -42,7 +43,7 @@ internal abstract partial class AbstractAddAwaitCodeFixProvider : AbstractAsyncC
         protected static bool TryGetTaskType(SemanticModel semanticModel, out INamedTypeSymbol taskType)
         {
             var compilation = semanticModel.Compilation;
-            taskType = compilation.GetTypeByMetadataName("System.Threading.Tasks.Task");
+            taskType = compilation.TaskType();
             return taskType != null;
         }
 

src/Features/Core/Portable/CodeRefactorings/MoveType/AbstractMoveTypeService.MoveTypeEditor.cs

@@ -157,7 +157,7 @@ private async Task<SyntaxNode> AddFinalNewLineIfDesired(Document document, Synta
                 // original attributes and we don't want to mess with them. 
                 AddPartialModifiersToTypeChain(documentEditor, 
                     removeAttributesAndComments: false, removeTypeInheritance: false);
-                documentEditor.RemoveNode(State.TypeNode, SyntaxRemoveOptions.KeepNoTrivia);
+                documentEditor.RemoveNode(State.TypeNode, SyntaxRemoveOptions.KeepUnbalancedDirectives);
 
                 var updatedDocument = documentEditor.GetChangedDocument();