src/Tools/jEdit/src/plugin.scala

   /* theory files */
 
   private lazy val delay_load =
     Swing_Thread.delay_last(Isabelle.session.load_delay)
     {
+      val view = jEdit.getActiveView()
+
       val buffers = Isabelle.jedit_buffers().toList
       def loaded_buffer(name: String): Boolean =
         buffers.exists(buffer => Isabelle.buffer_name(buffer) == name)
 
       val thys =
         for (buffer <- buffers; model <- Isabelle.document_model(buffer))
           yield model.name
-      val files = Isabelle.thy_info.dependencies(thys).map(_._1.node).filterNot(loaded_buffer _)
+      val files = Isabelle.thy_info.dependencies(thys).map(_._1.node).
+        filter(file => !loaded_buffer(file) && Isabelle.thy_load.check_file(view, file))
 
       if (!files.isEmpty) {
         val files_list = new ListView(Library.sort_strings(files))
         for (i <- 0 until files.length)
           files_list.selection.indices += i
 
         val answer =
-          Library.confirm_dialog(jEdit.getActiveView(),
+          Library.confirm_dialog(view,
             "Auto loading of required files",
             JOptionPane.YES_NO_OPTION,
             "The following files are required to resolve theory imports.",
             "Reload selected files now?",
             new ScrollPane(files_list))
         if (answer == 0)
           for {
             file <- files
-            if !loaded_buffer(file) && files_list.selection.items.contains(file)
+            if files_list.selection.items.contains(file)
           } jEdit.openFile(null: View, file)
       }
     }