Merge pull request #1952 from gnestor/display_order-index

Set mimerender index in `OutputArea.display_order`

notebook/static/notebook/js/outputarea.js

@@ -1072,11 +1072,15 @@ define([
         [MIME_PDF] : append_pdf
     };
     
-    OutputArea.prototype.register_mime_type = function (mimetype, append, safe) {
+    OutputArea.prototype.mime_types = function () {
+        return OutputArea.display_order;
+    };
+    
+    OutputArea.prototype.register_mime_type = function (mimetype, append, options) {
         if (mimetype && typeof(append) === 'function') {
             OutputArea.output_types.push(mimetype);
-            if (safe) OutputArea.safe_outputs[mimetype] = true;
-            OutputArea.display_order.unshift(mimetype);
+            if (options.safe) OutputArea.safe_outputs[mimetype] = true;
+            OutputArea.display_order.splice(options.index || 0, 0, mimetype);
             OutputArea.append_map[mimetype] = append;
         }
     };