tuned;

--- a/src/Tools/VSCode/extension/src/preview.ts	Wed Jun 14 14:11:30 2017 +0200
+++ b/src/Tools/VSCode/extension/src/preview.ts	Wed Jun 14 16:03:02 2017 +0200
@@ -37,10 +37,9 @@
 
 export function init(context: ExtensionContext, client: LanguageClient)
 {
-  language_client = client
-
   context.subscriptions.push(content_provider.register())
 
+  language_client = client
   language_client.onNotification(protocol.preview_response_type, params =>
     {
       const preview_uri = encode_preview(Uri.parse(params.uri))