The Tree shown on the left side of the split pane should be expandable/collapsable and it shouldn't result in page refresh and thus enhancing the user experience.
显示在分隔面板左侧的树应该可以展开/折叠（expandable/collapsable）而且不应导致页面刷新，这样会增强用户体验。
The Tree shown on the left side of the split pane should be expandable/collapsable and it shouldn't result in page refresh and thus enhancing the user experience.
显示在分隔面板左侧的树应该可以展开/折叠（expandable/collapsable）而且不应导致页面刷新，这样会增强用户体验。
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