The current Combobox/Option ordering logic uses React.children, key, and Option.fluentComponentType. This requires Options to be direct children of Combobox or OptionGroup, and for anyone extending Option to also set NewComponent.fluentComponentType (similar to Spectrum's Collection helper).

We should investigate querying the DOM to order options instead, since it doesn't have React component hierarchy restrictions.

Ref:

• comment thread: Create react-combobox package #21666 (comment)
• codesandbox w/ DOM compareDocumentPosition: https://codesandbox.io/s/practical-framework-ng2l3?file=/src/App.tsx
• codesandbox setting activedescendant directly with setAttribute: https://codesandbox.io/s/staging-glitter-vmgsky?file=/src/App.tsx

areas to investigate:

• any implications for virtualization
• will there be any issues with reordering options, or any other types of DOM modifications that might affect this?