src/Pure/PIDE/document.scala

--- a/src/Pure/PIDE/document.scala	Sat Apr 08 12:31:29 2017 +0200
+++ b/src/Pure/PIDE/document.scala	Sat Apr 08 12:47:34 2017 +0200
@@ -117,6 +117,7 @@
       def loaded_theory: Name = Name(theory, "", theory)
       def is_theory: Boolean = theory.nonEmpty
 
+      def theory_qualifier: String = Long_Name.qualifier(theory)
       def theory_base_name: String = Long_Name.base_name(theory)
 
       override def toString: String = if (is_theory) theory else node