Keyboard Usability

[Matt-Butler]

Thanks for sharing this solution! Nice work.

I did notice that the keyboard selection no longer works this example.

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To reproduce:

1. Focus on a tree item and press the "space" key.

Expected:

• The tree item is either selected or unselected.

Actual:

• Nothing happens.

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https://mui.com/x/react-tree-view/simple-tree-view/selection/#checkbox-selection