simplified;

--- a/src/Tools/VSCode/src/server.scala	Sun Mar 05 14:33:43 2017 +0100
+++ b/src/Tools/VSCode/src/server.scala	Sun Mar 05 14:43:39 2017 +0100
@@ -128,20 +128,18 @@
   {
     if (resources.close_model(file)) {
       file_watcher.register_parent(file)
-      if (!sync_documents(Set(file))) {
-        delay_input.invoke()
-        delay_output.invoke()
-      }
+      sync_documents(Set(file))
+      delay_input.invoke()
+      delay_output.invoke()
     }
   }
 
-  private def sync_documents(changed: Set[JFile]): Boolean =
-    if (resources.sync_models(changed)) {
-      delay_input.invoke()
-      delay_output.invoke()
-      true
-    }
-    else false
+  private def sync_documents(changed: Set[JFile])
+  {
+    resources.sync_models(changed)
+    delay_input.invoke()
+    delay_output.invoke()
+  }
 
   private def update_document(file: JFile, text: String)
   {

--- a/src/Tools/VSCode/src/vscode_resources.scala	Sun Mar 05 14:33:43 2017 +0100
+++ b/src/Tools/VSCode/src/vscode_resources.scala	Sun Mar 05 14:43:39 2017 +0100
@@ -131,8 +131,8 @@
         case Some(model) => (true, st.update_models(Some(file -> model.external(true))))
       })
 
-  def sync_models(changed_files: Set[JFile]): Boolean =
-    state.change_result(st =>
+  def sync_models(changed_files: Set[JFile]): Unit =
+    state.change(st =>
       {
         val changed_models =
           (for {
@@ -140,9 +140,8 @@
             if changed_files(file) && model.external_file
             text <- read_file_content(file)
             model1 <- model.update_text(text)
-          } yield (file, model1)).toMap
-        if (changed_models.isEmpty) (false, st)
-        else (true, st.update_models(changed_models))
+          } yield (file, model1)).toList
+        st.update_models(changed_models)
       })