force-redraw slides when markdown plugins finish loading

www/slide/slide.js

@@ -154,18 +154,22 @@ define([
         updateFontSize();
     };
 
-    Slide.update = function (content) {
+    Slide.update = function (content, force) {
         updateFontSize();
         if (!content) { content = ''; }
         var old = Slide.content;
         Slide.content = content.replace(/\n\s*\-\-\-\s*\n/g, '\n\n'+separator+'\n\n');
-        if (old !== Slide.content) {
+        if (force || old !== Slide.content) {
             draw(Slide.index);
             return;
         }
         change(Slide.lastIndex, Slide.index);
     };
 
+    DiffMd.onPluginLoaded(function () {
+        Slide.update(Slide.content, true);
+    });
+
     Slide.left = function () {
         console.log('left');
         Slide.lastIndex = Slide.index;