clarified: more uniform results;

--- a/src/Pure/PIDE/resources.scala	Wed Sep 27 13:29:52 2017 +0200
+++ b/src/Pure/PIDE/resources.scala	Wed Sep 27 14:48:25 2017 +0200
@@ -66,7 +66,7 @@
         val spans = syntax.parse_spans(text)
         val dir = Path.explode(name.master_dir)
         spans.iterator.map(Command.span_files(syntax, _)._1).flatten.
-          map(a => dir + Path.explode(a)).toList
+          map(a => (dir + Path.explode(a)).expand).toList
       }
       else Nil
     }