| clickedItem | 点击或通过键盘选择的项。 |
| keepMultiSelection | 应该保留现有的选择吗？这用于支持拖动或右键单击多重选择中的某一项。 |
| useShiftAsActionKey | 操作键是否应该像 Shift 键一样处理？如果是，则操作键还指示范围选择。 |
这是一个回调，决定了 TreeView 如何处理选择更改以响应按键和鼠标点击。
另请参阅：getNewSelectionOverride。
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