title: Extjs TreeStore, more than one asynchronous requests, treepanel rendering dislocation
body: <p>My extjs version is 6.5,I created a treepanel and GridPanel. When I click the record in GridPanel, the treeStore of treepanel will be triggered to load data. If I click the first record, TreeStore will load more data and slow down, but I have already clicked the second record. At the same time, the second click request has responded. As a result, treepanel will render the response data of the first click.</p>
  
  <p>Ext.data.store does not have this problem. How can I solve this problem?</p>