fix TimePicker cause jump occasionally

ant-design/ant-design#19698 (comment)

Author: afc163

.gitignore

@@ -29,7 +29,6 @@ coverage
 yarn.lock
 es/
 package-lock.json
-src/*.js
 src/*.map
 .prettierrc
 tslint.json

src/Header.jsx

@@ -22,10 +22,11 @@ class Header extends Component {
       // requestAnimationFrame will cause jump on rc-trigger 3.x
       // https://github.com/ant-design/ant-design/pull/19698#issuecomment-552889571
       // use setTimeout can resolve it
+      // 60ms is a magic timeout to avoid focusing before dropdown reposition correctly
       this.timeout = setTimeout(() => {
         this.refInput.focus();
         this.refInput.select();
-      });
+      }, 60);
     }
   }