src/Pure/PIDE/document.scala

--- a/src/Pure/PIDE/document.scala	Thu Oct 12 11:25:06 2017 +0200
+++ b/src/Pure/PIDE/document.scala	Thu Oct 12 11:39:06 2017 +0200
@@ -117,7 +117,7 @@
           case _ => false
         }
 
-      def path: Path = Path.explode(node)
+      def path: Path = Path.explode(File.standard_path(node))
 
       def is_theory: Boolean = theory.nonEmpty