Improve TreeView arrow keys navigation #370
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This PR updates how you can navigate around a
TreeViewusing just arrow keys.TreeViewItemup and down. This is the same as before.TreeViewItem, it will expand. If you press right again, the first child will be selected.TreeViewItemthat is folded or has no children, its parent will be selected. If you press left on aTreeViewItemthat is open (with children), it will close.Note: As far as I can tell, this is how the TreeView in VS Code behaves. So why not emulate it?
Fixes #369