src/Pure/PIDE/document.scala

--- a/src/Pure/PIDE/document.scala	Thu Dec 28 22:53:45 2017 +0100
+++ b/src/Pure/PIDE/document.scala	Thu Dec 28 23:10:30 2017 +0100
@@ -120,6 +120,7 @@
       def path: Path = Path.explode(File.standard_path(node))
 
       def is_bibtex: Boolean = Bibtex.is_bibtex(node)
+      def is_bibtex_theory: Boolean = Bibtex.is_bibtex(theory)
 
       def is_theory: Boolean = theory.nonEmpty