Fix synchronization of DesignTimeDocument

src/Workspaces/Remote/Core/AbstractAssetProvider.cs

@@ -114,7 +114,9 @@ public async Task<DocumentInfo> CreateDocumentInfoAsync(Checksum documentChecksu
                 documentInfo.SourceCodeKind,
                 textLoader,
                 documentInfo.FilePath,
-                documentInfo.IsGenerated);
+                documentInfo.IsGenerated,
+                documentInfo.DesignTimeOnly,
+                documentServiceProvider: null);
         }
 
         private async Task<IEnumerable<DocumentInfo>> CreateDocumentInfosAsync(ChecksumCollection documentChecksums, CancellationToken cancellationToken)

src/Workspaces/Remote/ServiceHub/Host/RemoteWorkspace.SolutionCreator.cs

@@ -429,6 +429,7 @@ private async Task<TextDocument> UpdateDocumentInfoAsync(TextDocument document,
                 Contract.ThrowIfFalse(document.State.Attributes.Name == newDocumentInfo.Name);
                 Contract.ThrowIfFalse(document.State.Attributes.FilePath == newDocumentInfo.FilePath);
                 Contract.ThrowIfFalse(document.State.Attributes.IsGenerated == newDocumentInfo.IsGenerated);
+                Contract.ThrowIfFalse(document.State.Attributes.DesignTimeOnly == newDocumentInfo.DesignTimeOnly);
 
                 if (document.State.Attributes.Folders != newDocumentInfo.Folders)
                 {