MUI-X Tree View with Parent/Child Relationship and Indeterminate Checkboxes

I needed this functionality for a project where our team uses MUI, so I wanted to share a minimal example of my implementation. It requires some saved state to share between the tree and the items, and a way to programmatically add parents to the items.

Inspired by:

• Selectable Tree view by @michelengelen
• MUI Rich Tree View - Customization - Common examples
• MUI Rich Tree View - Selection - Parent/children relationship

MUI-X Issues:

• Support parent / children selection relationship
• How to have Selectable Tree component