refactor: Use raf to make scroll faster

Author: zombieJ

package.json

@@ -59,6 +59,7 @@
   },
   "dependencies": {
     "classnames": "^2.2.6",
+    "raf": "^3.4.1",
     "rc-util": "^4.8.0"
   }
 }

src/List.tsx

@@ -1,5 +1,6 @@
 import * as React from 'react';
 import classNames from 'classnames';
+import raf from 'raf';
 import Filler from './Filler';
 import {
   getElementScrollPercentage,
@@ -468,7 +469,7 @@ class List<T = any> extends React.Component<ListProps<T>, ListState<T>> {
   };
 
   public scrollTo = (arg0: number | ScrollConfig) => {
-    setTimeout(() => {
+    raf(() => {
       // Number top
       if (typeof arg0 === 'object') {
         const { isVirtual } = this.state;

tests/__mocks__/raf.js

@@ -0,0 +1,3 @@
+export default function raf(callback) {
+  setTimeout(callback);
+}