restore append-after-render

so all output types are handled consistently

notebook/static/notebook/js/outputarea.js

@@ -324,10 +324,6 @@ define([
                 console.log("unrecognized output type: " + json.output_type);
                 this.append_unrecognized(json);
         }
-        
-        if (record_output) {
-            this.outputs.push(json);
-        }
 
         if (json.output_type === 'display_data') {
             var that = this;
@@ -335,6 +331,10 @@ define([
         } else {
             this.handle_appended();
         }
+
+        if (record_output) {
+            this.outputs.push(json);
+        }
     };
 
     OutputArea.prototype.handle_appended = function () {
@@ -621,9 +621,7 @@ define([
             targets = this._display_id_targets[display_id] = [];
         }
         targets.push({
-            // output has been appended when this is called,
-            // so use the index of the last item.
-            index: this.outputs.length - 1,
+            index: this.outputs.length,
             element: element,
         });
     };