[TreeView] Visually select the ancestors of a selected item about mui-x HOT 3 OPEN

It's an interesting use-case
For me it can be done in user-land as you said, but maybe not in an optimal way.
To do it, you one way is to use multiSelect and control the selection using selectedItems and onSelectedItemsChange to select all the ancestors when selecting an item.
But since you are using multiSelect, the Tree View will allow stuff like range selection using Shift which may not be what the user want here. You may be able to opt-out of those behaviors using event.defaultMuiPrevented on the relevant event handlers, but this could be quite fragile.

The clean implementation would be to only display the ancestors as selected but not have it in the model, that way people can use multiSelect if they want or stay with single selection.
To do that in user land would require creating a custom TreeItem, control the selection and pass a prop on the item slot of the RichTreeView component (for SimpleTreeView the implementation would differ here) saying if the item is visually selected or not and re-apply manually the style if needed.

We should definitely do a recipe a see how viable each approach is and pick the best one.

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Hey @amit-8
You can use the treeview public api for this. There is the getItem method with which you can get the parent item by its id. With this item you can do your modifications as needed.

@flaviendelangle should we document cases like this with a recipe as well?

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