fix: remove this.isIn

src/Tree.js

@@ -755,7 +755,7 @@ onExpand(treeNode,keyType) {
     const targetDom = e.target;
 
     // 如果当前tree节点不包括上一个焦点节点会触发此方法
-    if(this.tree == targetDom && !this.isIn && !this.tree.contains(e.relatedTarget)){
+    if(this.tree == targetDom && !this.tree.contains(e.relatedTarget)){
       const {onFocus, children} = this.props;
       const {selectedKeys=[]} = this.state;
       let tabIndexKey = selectedKeys[0]
@@ -784,17 +784,6 @@ onExpand(treeNode,keyType) {
       }
   }
 
-
-  onUlMouseEnter(e){
-    this.isIn = true;
-    // console.log('onUlMouseEnter----isIn-----',this.isIn);
-  }
-  onUlMouseLeave(e){
-    this.isIn = false;
-    // console.log('onUlMouseLeave----isIn-----',this.isIn);
-
-  }
-
   getFilterExpandedKeys(props, expandKeyProp, expandAll) {
     const keys = props[expandKeyProp];
     if (!expandAll && !props.autoExpandParent) {
@@ -1176,8 +1165,6 @@ onExpand(treeNode,keyType) {
 
     if (focusable) {
       domProps.onFocus = this.onUlFocus;
-      domProps.onMouseEnter = this.onUlMouseEnter;
-      domProps.onMouseLeave = this.onUlMouseLeave;
     }
 
     // if (props.focusable) {