feat: improve flatten treeData

Author: aojunhao123

src/OptionList.tsx

@@ -162,10 +162,16 @@ const OptionList: React.ForwardRefRenderFunction<ReviseRefOptionListProps> = (_,
     nodes: EventDataNode<any>[],
     searchVal?: string,
   ): EventDataNode<any> | null => {
-    // Flatten the tree structure
-    const flattenedNodes = flattenTreeData(nodes, true, fieldNames);
+    // 使用 mergedExpandedKeys 而不是 true
+    // 这样可以保持与实际展示状态一致
+    const flattenedNodes = flattenTreeData(
+      nodes,
+      // 搜索时展开所有节点以便搜索，否则使用当前展开状态
+      searchVal ? true : mergedExpandedKeys,
+      fieldNames,
+    );
 
-    // Iterate through the flattened array to find the first matching node
+    // 查找第一个匹配的节点
     const matchedNode = flattenedNodes.find(node => {
       const rawNode = node.data as EventDataNode<any>;
       if (rawNode.disabled || rawNode.selectable === false) {