Passing test "renders correctly when root"

snabbdom.js

@@ -213,8 +213,7 @@ function init(modules) {
     for (i = 0; i < cbs.pre.length; ++i) cbs.pre[i]();
     if (oldVnode instanceof Element) {
       if (oldVnode.parentElement !== null) {
-        createElm(vnode, insertedVnodeQueue);
-        oldVnode.parentElement.replaceChild(vnode.elm, oldVnode);
+        oldVnode.parentElement.replaceChild(createElm(vnode, insertedVnodeQueue), oldVnode);
       } else {
         oldVnode = emptyNodeAt(oldVnode);
         patchVnode(oldVnode, vnode, insertedVnodeQueue);

thunk.js

@@ -9,7 +9,7 @@ function prepatch(oldThunk, thunk) {
   var i, old = oldThunk.data, cur = thunk.data;
   var oldArgs = old.args, args = cur.args;
   cur.vnode = old.vnode;
-  if (oldArgs.length !== args.length) {
+  if (old.fn !== cur.fn || oldArgs.length !== args.length) {
     cur.vnode = cur.fn.apply(undefined, args);
     return;
   }