fix: clear cache when users click clear icon

close ant-design/ant-design#6731

Author: paranoidjk

src/Select.jsx

@@ -138,7 +138,7 @@ class Select extends Component {
     this.renderedTreeData = this.renderTreeData(nextProps);
     // Detecting whether the object of `onChange`'s argument  is old ref.
     // Better to do a deep equal later.
-    this._cacheTreeNodesStates = this._cacheTreeNodesStates !== 'no' &&
+    this._cacheTreeNodesStates = !this._cacheTreeNodesStates &&
                                  this._savedValue &&
                                  nextProps.value === this._savedValue;
     if (this.props.treeData !== nextProps.treeData ||
@@ -375,7 +375,8 @@ class Select extends Component {
       return;
     }
     event.stopPropagation();
-    this._cacheTreeNodesStates = 'no';
+    this._cacheTreeNodesStates = false;
+    this._checkedNodes = [];
     if (state.inputValue || state.value.length) {
       this.fireChange([]);
       this.setOpenState(false);
@@ -640,7 +641,7 @@ class Select extends Component {
     if (props.disabled) {
       return;
     }
-    this._cacheTreeNodesStates = 'no';
+    this._cacheTreeNodesStates = false;
     if (props.treeCheckable &&
       (props.showCheckedStrategy === SHOW_ALL || props.showCheckedStrategy === SHOW_PARENT)
       && !(props.treeCheckStrictly || this.state.inputValue)) {

tests/__mocks__/rc-trigger.js

@@ -4,7 +4,7 @@ const Trigger = require.requireActual('rc-trigger');
 
 const render = Trigger.prototype.render;
 
-Trigger.prototype.render = function () {
+Trigger.prototype.render = function _render() {
   const { popupVisible } = this.state;
   return (
     <div id="TriggerContainer">