Resolves #8.

Author: back2dos

src/coconut/diffing/Differ.hx

@@ -167,7 +167,7 @@ class Differ<Real:{}> {
         case null:
           renderAll(nodes, parent, later);
         case v:
-          v.each(later, function (_) lastCount++);
+          v.justCount();
           updateAll(v, nodes, parent, later);
       }
 

src/coconut/diffing/Rendered.hx

@@ -21,6 +21,15 @@ class Rendered<Real:{}> {
     return found;
   }
 
+  public function justCount() {
+    var ret = 0;
+    for (c in childList) ret += switch c {
+      case RNative(_, _, _): 1;
+      case RWidget(w, _): @:privateAccess w._coco_lastRender.justCount();
+    }
+    return ret;
+  }
+
   public function each(later:Later, f:Real->Void) {
     function rec(children:Array<RNode<Real>>)
       for (c in children) switch c {