Make m.redraw() strictly asynchronous

test-utils/throttleMock.js

@@ -0,0 +1,24 @@
+module.exports = function() {
+  var queue = []
+  return {
+    throttle: function(fn) {
+      var pending = false
+      return function() {
+        if (!pending) {
+          queue.push(function(){
+            pending = false
+            fn()
+          })
+          pending = true
+        }
+      }
+    },
+    fire: function() {
+      queue.forEach(function(fn) {fn()})
+      queue.length = 0
+    },
+    queueLength: function(){
+      return queue.length
+    }
+  }
+}