Vxe-table Tree Data Virtual Scroll does not work when tree-config / transform = false

[martinfruehmorgen]

可复现的链接：

https://codesandbox.io/s/vxe-table-4-x-vue-3-0-wen-ti-yan-shi-forked-0tdjsm?file=/src/views/Demo1.vue

问题描述与截图：

In the codepen you will find 2 TreeTables. One with flat data with :tree-config="{ transform: true, rowField: 'id', parentField: 'parentId', expandAll: true, }"

and one with hierchical data with :tree-config="{ transform: false, expandAll: true, }"

The virtual scroller does not work for the second treetable (check in the inspector the class of the vxe-table. The first has is--virtual-y the second not)

期望的结果：

Both tables should have the virtual scolling available.

操作系统：

Windows 11

浏览器版本：

Edge Version 100.0.1185.50

vue 版本：

3.2.33

vxe-table 版本：

4.2.3

[xuliangzhan]

tree virtual scrolling can only be used if tree-config.transform is set.