diff -r 08c2d80428ff -r 3ebf9f8299df src/Tools/VSCode/src/vscode_rendering.scala
--- a/src/Tools/VSCode/src/vscode_rendering.scala	Thu Dec 29 22:10:29 2016 +0100
+++ b/src/Tools/VSCode/src/vscode_rendering.scala	Fri Dec 30 10:26:10 2016 +0100
@@ -88,7 +88,7 @@
         opt_text match {
           case Some(text) if range.start > 0 =>
             val chunk = Symbol.Text_Chunk(text)
-            val doc = Line.Document(text, model.doc.text_length)
+            val doc = Line.Document(text, resources.text_length)
             doc.range(chunk.decode(range))
           case _ =>
             Line.Range(Line.Position((line1 - 1) max 0))